GHSA-79hg-h6r6-64mm

GHSA-79hg-h6r6-64mm PUBLISHED CVSS 7 HIGH

Record from GitHub Advisory Database · Published July 8, 2024

A signal handler race condition vulnerability 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(). This issue leaves it vulnerable to a signal handler race condition on the cleanup_exit() function, which introduces the same vulnerability as CVE-2024-6387 in the unprivileged child of the SSHD server.

Risk scores

CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

Timeline

Jul 8, 2024 CVE Published
Apr 10, 2026 Distribution Patch (7 in total, the first dated here)
May 1, 2026 Security Advisory

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The same record, from the CLI:

vulnetix vdb vuln GHSA-79hg-h6r6-64mm
vulnetix vdb fixes GHSA-79hg-h6r6-64mm

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curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/GHSA-79hg-h6r6-64mm/fixes/registry"

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References

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