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Debian Security Advisory DSA-5724-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
July 01, 2024                         https://www.debian.org/security/faq
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Package        : openssh
CVE ID         : CVE-2024-6387

The Qualys Threat Research Unit (TRU) discovered that OpenSSH, an
implementation of the SSH protocol suite, is prone to a signal handler
race condition. If a client does not authenticate within LoginGraceTime
seconds (120 by default), then sshd's SIGALRM handler is called
asynchronously and calls various functions that are not
async-signal-safe. A remote unauthenticated attacker can take advantage
of this flaw to execute arbitrary code with root privileges. This flaw
affects sshd in its default configuration.

Details can be found in the Qualys advisory at
https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt

For the stable distribution (bookworm), this problem has been fixed in
version 1:9.2p1-2+deb12u3.

We recommend that you upgrade your openssh packages.

For the detailed security status of openssh please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/openssh

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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