rhsa-2016_0623
Vulnerability from csaf_redhat
Published
2016-04-12 19:15
Modified
2024-11-22 10:00
Summary
Red Hat Security Advisory: samba security update
Notes
Topic
An update for samba is now available for Red Hat Enterprise Linux 5.6 Long Life and Red Hat Enterprise Linux 5.9 Long Life.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
[Updated 13 April 2016]
This advisory previously incorrectly listed the CVE-2015-5370 issue as addressed by this update. However, this issue did not affect the samba packages on Red Hat Enterprise Linux 5.6 and 5.9 Long Life. No changes have been made to the packages.
[Updated 14 April 2016]
This advisory previously incorrectly listed the CVE-2016-2112 issue as addressed by this update. However, this issue did not affect the samba packages on Red Hat Enterprise Linux 5.6 and 5.9 Long Life. The CVE-2016-2115 was also incorrectly listed as addressed by this update. This issue does affect the samba packages on Red Hat Enterprise Linux 5.6 and 5.9 Long Life. Customers are advised to use the "client signing = required" configuration option in the smb.conf file to mitigate CVE-2016-2115. No changes have been made to the packages.
Details
Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information.
Security Fix(es):
* A protocol flaw, publicly referred to as Badlock, was found in the Security Account Manager Remote Protocol (MS-SAMR) and the Local Security Authority (Domain Policy) Remote Protocol (MS-LSAD). Any authenticated DCE/RPC connection that a client initiates against a server could be used by a man-in-the-middle attacker to impersonate the authenticated user against the SAMR or LSA service on the server. As a result, the attacker would be able to get read/write access to the Security Account Manager database, and use this to reveal all passwords or any other potentially sensitive information in that database. (CVE-2016-2118)
* Several flaws were found in Samba's implementation of NTLMSSP authentication. An unauthenticated, man-in-the-middle attacker could use this flaw to clear the encryption and integrity flags of a connection, causing data to be transmitted in plain text. The attacker could also force the client or server into sending data in plain text even if encryption was explicitly requested for that connection. (CVE-2016-2110)
* It was discovered that Samba configured as a Domain Controller would establish a secure communication channel with a machine using a spoofed computer name. A remote attacker able to observe network traffic could use this flaw to obtain session-related information about the spoofed machine. (CVE-2016-2111)
Red Hat would like to thank the Samba project for reporting these issues. Upstream acknowledges Stefan Metzmacher (SerNet) as the original reporter of CVE-2016-2118 and CVE-2016-2110.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"text": "Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information.\n\nSecurity Fix(es):\n\n* A protocol flaw, publicly referred to as Badlock, was found in the Security Account Manager Remote Protocol (MS-SAMR) and the Local Security Authority (Domain Policy) Remote Protocol (MS-LSAD). Any authenticated DCE/RPC connection that a client initiates against a server could be used by a man-in-the-middle attacker to impersonate the authenticated user against the SAMR or LSA service on the server. As a result, the attacker would be able to get read/write access to the Security Account Manager database, and use this to reveal all passwords or any other potentially sensitive information in that database. (CVE-2016-2118)\n\n* Several flaws were found in Samba\u0027s implementation of NTLMSSP authentication. An unauthenticated, man-in-the-middle attacker could use this flaw to clear the encryption and integrity flags of a connection, causing data to be transmitted in plain text. The attacker could also force the client or server into sending data in plain text even if encryption was explicitly requested for that connection. (CVE-2016-2110)\n\n* It was discovered that Samba configured as a Domain Controller would establish a secure communication channel with a machine using a spoofed computer name. A remote attacker able to observe network traffic could use this flaw to obtain session-related information about the spoofed machine. (CVE-2016-2111)\n\nRed Hat would like to thank the Samba project for reporting these issues. Upstream acknowledges Stefan Metzmacher (SerNet) as the original reporter of CVE-2016-2118 and CVE-2016-2110.",
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{
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"title": "Vulnerability description"
},
{
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},
{
"category": "general",
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"title": "CVSS score applicability"
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"title": "Vulnerability description"
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{
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"text": "samba: Spoofing vulnerability when domain controller is configured",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
"category": "impact",
"details": "Moderate"
}
],
"title": "samba: Spoofing vulnerability when domain controller is configured"
},
{
"acknowledgments": [
{
"names": [
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]
},
{
"names": [
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],
"organization": "SerNet",
"summary": "Acknowledged by upstream."
}
],
"cve": "CVE-2016-2118",
"cwe": {
"id": "CWE-300",
"name": "Channel Accessible by Non-Endpoint"
},
"discovery_date": "2016-03-15T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1317990"
}
],
"notes": [
{
"category": "description",
"text": "A protocol flaw, publicly referred to as Badlock, was found in the Security Account Manager Remote Protocol (MS-SAMR) and the Local Security Authority (Domain Policy) Remote Protocol (MS-LSAD). Any authenticated DCE/RPC connection that a client initiates against a server could be used by a man-in-the-middle attacker to impersonate the authenticated user against the SAMR or LSA service on the server. As a result, the attacker would be able to get read/write access to the Security Account Manager database, and use this to reveal all passwords or any other potentially sensitive information in that database.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "samba: SAMR and LSA man in the middle attacks",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
"category": "external",
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{
"category": "external",
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},
{
"category": "external",
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{
"category": "external",
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{
"category": "external",
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}
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{
"category": "vendor_fix",
"date": "2016-04-12T19:15:52+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nAfter installing this update, the smb service will be restarted automatically.",
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"5Server-5.9.AUS:samba-debuginfo-0:3.0.33-3.40.el5_9.x86_64",
"5Server-5.9.AUS:samba-swat-0:3.0.33-3.40.el5_9.i386",
"5Server-5.9.AUS:samba-swat-0:3.0.33-3.40.el5_9.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "samba: SAMR and LSA man in the middle attacks"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.