GHSA-2X8C-95VH-GFV4

Vulnerability from github – Published: 2024-07-01 15:32 – Updated: 2025-04-24 21:31
VLAI?
Details

A signal handler race condition was found in OpenSSH's server (sshd), where a client does not authenticate within LoginGraceTime seconds (120 by default, 600 in old OpenSSH versions), then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog().

Severity ?
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-6387"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362",
      "CWE-364"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-01T13:15:06Z",
    "severity": "HIGH"
  },
  "details": "A signal handler race condition was found in OpenSSH\u0027s server (sshd), where a client does not authenticate within LoginGraceTime seconds (120 by default, 600 in old OpenSSH versions), then sshd\u0027s SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog().",
  "id": "GHSA-2x8c-95vh-gfv4",
  "modified": "2025-04-24T21:31:48Z",
  "published": "2024-07-01T15:32:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-6387"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rapier1/hpn-ssh/issues/87"
    },
    {
      "type": "WEB",
      "url": "https://github.com/oracle/oracle-linux/issues/149"
    },
    {
      "type": "WEB",
      "url": "https://github.com/microsoft/azurelinux/issues/9555"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PowerShell/Win32-OpenSSH/issues/2249"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Azure/AKS/issues/4379"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AlmaLinux/updates/issues/629"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openela-main/openssh/commit/e1f438970e5a337a17070a637c1b9e19697cad09"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2024:4312"
    },
    {
      "type": "WEB",
      "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0010"
    },
    {
      "type": "WEB",
      "url": "https://santandersecurityresearch.github.io/blog/sshing_the_masses.html"
    },
    {
      "type": "WEB",
      "url": "https://security-tracker.debian.org/tracker/CVE-2024-6387"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20240701-0001"
    },
    {
      "type": "WEB",
      "url": "https://sig-security.rocky.page/issues/CVE-2024-6387"
    },
    {
      "type": "WEB",
      "url": "https://stackdiary.com/openssh-race-condition-in-sshd-allows-remote-code-execution"
    },
    {
      "type": "WEB",
      "url": "https://support.apple.com/kb/HT214118"
    },
    {
      "type": "WEB",
      "url": "https://support.apple.com/kb/HT214119"
    },
    {
      "type": "WEB",
      "url": "https://support.apple.com/kb/HT214120"
    },
    {
      "type": "WEB",
      "url": "https://ubuntu.com/security/CVE-2024-6387"
    },
    {
      "type": "WEB",
      "url": "https://ubuntu.com/security/notices/USN-6859-1"
    },
    {
      "type": "WEB",
      "url": "https://www.akamai.com/blog/security-research/2024-openssh-vulnerability-regression-what-to-know-and-do"
    },
    {
      "type": "WEB",
      "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/19904-security-advisory-0100"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/52269"
    },
    {
      "type": "WEB",
      "url": "https://www.freebsd.org/security/advisories/FreeBSD-SA-24:04.openssh.asc"
    },
    {
      "type": "WEB",
      "url": "https://www.openssh.com/txt/release-9.8"
    },
    {
      "type": "WEB",
      "url": "https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt"
    },
    {
      "type": "WEB",
      "url": "https://www.splunk.com/en_us/blog/security/cve-2024-6387-regresshion-vulnerability.html"
    },
    {
      "type": "WEB",
      "url": "https://www.suse.com/security/cve/CVE-2024-6387.html"
    },
    {
      "type": "WEB",
      "url": "https://www.theregister.com/2024/07/01/regresshion_openssh"
    },
    {
      "type": "WEB",
      "url": "https://www.vicarius.io/vsociety/posts/regresshion-an-openssh-regression-error-cve-2024-6387"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2024:4340"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2024:4389"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2024:4469"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2024:4474"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2024:4479"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2024:4484"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2024-6387"
    },
    {
      "type": "WEB",
      "url": "https://archlinux.org/news/the-sshd-service-needs-to-be-restarted-after-upgrading-to-openssh-98p1"
    },
    {
      "type": "WEB",
      "url": "https://arstechnica.com/security/2024/07/regresshion-vulnerability-in-openssh-gives-attackers-root-on-linux"
    },
    {
      "type": "WEB",
      "url": "https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2294604"
    },
    {
      "type": "WEB",
      "url": "https://explore.alas.aws.amazon.com/CVE-2024-6387.html"
    },
    {
      "type": "WEB",
      "url": "https://forum.vmssoftware.com/viewtopic.php?f=8\u0026t=9132"
    },
    {
      "type": "WEB",
      "url": "https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2024-002.txt.asc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PowerShell/Win32-OpenSSH/discussions/2248"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zgzhang/cve-2024-6387-poc"
    },
    {
      "type": "WEB",
      "url": "https://lists.almalinux.org/archives/list/announce@lists.almalinux.org/thread/23BF5BMGFVEVUI2WNVAGMLKT557EU7VY"
    },
    {
      "type": "WEB",
      "url": "https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.mindrot.org/pipermail/openssh-unix-dev/2024-July/041431.html"
    },
    {
      "type": "WEB",
      "url": "https://news.ycombinator.com/item?id=40843778"
    },
    {
      "type": "WEB",
      "url": "https://packetstorm.news/files/id/190587"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2024/Jul/18"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2024/Jul/19"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2024/Jul/20"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/01/12"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/01/13"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/02/1"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/03/1"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/03/11"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/03/2"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/03/3"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/03/4"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/03/5"
    },
    {
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      "url": "http://www.openwall.com/lists/oss-security/2024/07/04/1"
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    },
    {
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    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/10/6"
    },
    {
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      "url": "http://www.openwall.com/lists/oss-security/2024/07/11/1"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/11/3"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/23/4"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/23/6"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/07/28/2"
    },
    {
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      "url": "http://www.openwall.com/lists/oss-security/2024/07/28/3"
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  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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