CVE-2024-7589

Name	CVE-2024-7589
Description	A signal handler in sshd(8) may call a logging function that is not async-signal-safe. The signal handler is invoked when a client does not authenticate within the LoginGraceTime seconds (120 by default). This signal handler executes in the context of the sshd(8)'s privileged code, which is not sandboxed and runs with full root privileges. This issue is another instance of the problem in CVE-2024-6387 addressed by FreeBSD-SA-24:04.openssh. The faulty code in this case is from the integration of blacklistd in OpenSSH in FreeBSD. As a result of calling functions that are not async-signal-safe in the privileged sshd(8) context, a race condition exists that a determined attacker may be able to exploit to allow an unauthenticated remote code execution as root.
Source	CVE (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 Package	Release	Version	Status
openssh (PTS)	jessie, jessie (lts)	1:6.7p1-5+deb8u10	fixed
	stretch (security)	1:7.4p1-10+deb9u6	fixed
	stretch (lts), stretch	1:7.4p1-10+deb9u9	fixed
	buster (security), buster, buster (lts)	1:7.9p1-10+deb10u4	fixed
	bullseye (security), bullseye	1:8.4p1-5+deb11u3	fixed
	bookworm (security), bookworm	1:9.2p1-2+deb12u3	fixed
	sid, trixie	1:9.9p1-3	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
openssh	source	(unstable)	(not affected)

- openssh <not-affected> (Only affects OpenSSH as shipped in FreeBSD)