CVE-2024-6409

NameCVE-2024-6409
DescriptionA race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssh (PTS)bullseye (security), bullseye1:8.4p1-5+deb11u3fixed
bookworm1:9.2p1-2+deb12u2fixed
bookworm (security)1:9.2p1-2+deb12u3fixed
sid, trixie1:9.7p1-7fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensshsource(unstable)(not affected)

Notes

- openssh <not-affected> (Exploitable issue in RHEL9 packaged versions)
https://www.openwall.com/lists/oss-security/2024/07/08/2

Search for package or bug name: Reporting problems