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

Vulnerability from cvelistv5 – Published: 2024-07-01 12:37 – Updated: 2026-07-14 12:37
VLAI
Title
Openssh: regresshion - race condition in ssh allows rce/dos
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
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-364 - Signal Handler Race Condition
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2024:4312 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4340 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4389 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4469 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4474 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4479 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4484 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2024-6387 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2294604 issue-trackingx_refsource_REDHAT
https://santandersecurityresearch.github.io/blog/…
https://www.openssh.com/txt/release-9.8
https://www.qualys.com/2024/07/01/cve-2024-6387/r…
https://www.vicarius.io/vsociety/posts/regresshio…
https://www.exploit-db.com/exploits/52269
https://packetstorm.news/files/id/190587/
http://www.openwall.com/lists/oss-security/2024/0… x_transferred
http://www.openwall.com/lists/oss-security/2024/0… x_transferred
http://www.openwall.com/lists/oss-security/2024/07/02/1 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/03/1 x_transferred
http://www.openwall.com/lists/oss-security/2024/0… x_transferred
http://www.openwall.com/lists/oss-security/2024/07/03/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/03/3 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/03/4 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/03/5 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/04/1 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/04/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/08/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/08/3 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/09/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/09/5 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/10/1 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/10/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/10/3 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/10/4 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/10/6 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/11/1 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/11/3 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/23/4 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/23/6 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/28/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/28/3 x_transferred
https://archlinux.org/news/the-sshd-service-needs… x_transferred
https://arstechnica.com/security/2024/07/regressh… x_transferred
https://blog.qualys.com/vulnerabilities-threat-re… x_transferred
https://explore.alas.aws.amazon.com/CVE-2024-6387.html x_transferred
https://forum.vmssoftware.com/viewtopic.php?f=8&t=9132 x_transferred
https://ftp.netbsd.org/pub/NetBSD/security/adviso… x_transferred
https://github.com/AlmaLinux/updates/issues/629 x_transferred
https://github.com/Azure/AKS/issues/4379 x_transferred
https://github.com/PowerShell/Win32-OpenSSH/discu… x_transferred
https://github.com/PowerShell/Win32-OpenSSH/issues/2249 x_transferred
https://github.com/microsoft/azurelinux/issues/9555 x_transferred
https://github.com/openela-main/openssh/commit/e1… x_transferred
https://github.com/oracle/oracle-linux/issues/149 x_transferred
https://github.com/rapier1/hpn-ssh/issues/87 x_transferred
https://github.com/zgzhang/cve-2024-6387-poc x_transferred
https://lists.almalinux.org/archives/list/announc… x_transferred
https://lists.mindrot.org/pipermail/openssh-unix-… x_transferred
https://lists.mindrot.org/pipermail/openssh-unix-… x_transferred
https://news.ycombinator.com/item?id=40843778 x_transferred
https://psirt.global.sonicwall.com/vuln-detail/SN… x_transferred
https://security-tracker.debian.org/tracker/CVE-2… x_transferred
https://security.netapp.com/advisory/ntap-2024070… x_transferred
https://sig-security.rocky.page/issues/CVE-2024-6387/ x_transferred
https://stackdiary.com/openssh-race-condition-in-… x_transferred
https://ubuntu.com/security/CVE-2024-6387 x_transferred
https://ubuntu.com/security/notices/USN-6859-1 x_transferred
https://www.akamai.com/blog/security-research/202… x_transferred
https://www.arista.com/en/support/advisories-noti… x_transferred
https://www.freebsd.org/security/advisories/FreeB… x_transferred
https://www.splunk.com/en_us/blog/security/cve-20… x_transferred
https://www.suse.com/security/cve/CVE-2024-6387.html x_transferred
https://www.theregister.com/2024/07/01/regresshio… x_transferred
https://support.apple.com/kb/HT214119 x_transferred
https://support.apple.com/kb/HT214118 x_transferred
https://support.apple.com/kb/HT214120 x_transferred
http://seclists.org/fulldisclosure/2024/Jul/20 x_transferred
http://seclists.org/fulldisclosure/2024/Jul/18 x_transferred
http://seclists.org/fulldisclosure/2024/Jul/19 x_transferred
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…
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:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
 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:/a:redhat:rhel_e4s:9.0::appstream
    cpe:/o:redhat:rhel_e4s:9.0::baseos
 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::el8
    cpe:/a:redhat:openshift:4.14::el9
 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.
Siemens Industrial Edge Management OS (IEM-OS) Affected: 0 , < * (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
Siemens SINAMICS IIoT module Affected: 0 , < V1.0 HF1 (custom)
Create a notification for this product.
Siemens SINEMA Remote Connect Server Affected: 0 , < V3.2 SP2 (custom)
Create a notification for this product.
Siemens SINUMERIK ONE Affected: 0 , < V6.24 (custom)
Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
Date Public
2024-07-01 08:00
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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      "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().\"}]",
      "id": "CVE-2024-6387",
      "lastModified": "2024-11-21T09:49:33.050",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"secalert@redhat.com\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 8.1, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 5.9}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 8.1, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 5.9}]}",
      "published": "2024-07-01T13:15:06.467",
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\"https://security-tracker.debian.org/tracker/CVE-2024-6387\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240701-0001/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://sig-security.rocky.page/issues/CVE-2024-6387/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://stackdiary.com/openssh-race-condition-in-sshd-allows-remote-code-execution/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://support.apple.com/kb/HT214118\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://support.apple.com/kb/HT214119\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://support.apple.com/kb/HT214120\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://ubuntu.com/security/CVE-2024-6387\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://ubuntu.com/security/notices/USN-6859-1\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://www.akamai.com/blog/security-research/2024-openssh-vulnerability-regression-what-to-know-and-do\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://www.arista.com/en/support/advisories-notices/security-advisory/19904-security-advisory-0100\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://www.freebsd.org/security/advisories/FreeBSD-SA-24:04.openssh.asc\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://www.openssh.com/txt/release-9.8\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Release Notes\", \"Third Party Advisory\"]}, {\"url\": \"https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Third Party Advisory\"]}, {\"url\": 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      "sourceIdentifier": "secalert@redhat.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"secalert@redhat.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-364\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-362\"}]}]"
    },
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      "current_release_date": "2026-07-14T13:11:55+00:00",
      "cve": "CVE-2024-6387",
      "id": "CVE-2024-6387",
      "initial_release_date": "2024-07-01T08:00:00+00:00",
      "product_status:fixed": "275",
      "product_status:known_not_affected": "1985",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openssh: regreSSHion - race condition in SSH allows RCE/DoS",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-6387.json",
      "version": "3"
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      "current_release_date": "2026-08-06T01:55:56Z",
      "cve": "CVE-2024-6387",
      "id": "CVE-2024-6387",
      "initial_release_date": "2024-07-03T03:39:34Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "391",
      "product_status:recommended": "130",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-6387",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-6387.json",
      "version": "55"
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}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.