CVE-2008-4109

Name	CVE-2008-4109
Description	A certain Debian patch for OpenSSH before 4.3p2-9etch3 on etch; before 4.6p1-1 on sid and lenny; and on other distributions such as SUSE uses functions that are not async-signal-safe in the signal handler for login timeouts, which allows remote attackers to cause a denial of service (connection slot exhaustion) via multiple login attempts. NOTE: this issue exists because of an incorrect fix for CVE-2006-5051.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
References	CVE-2006-5051, DSA-1638-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
openssh (PTS)	buster	1:7.9p1-10+deb10u2	fixed
	buster (security)	1:7.9p1-10+deb10u1	fixed
	bullseye	1:8.4p1-5+deb11u1	fixed
	bookworm, sid	1:9.2p1-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
openssh	source	etch	1:4.3p2-9etch3		DSA-1638-1
openssh	source	(unstable)	1:4.6p1-1	low

Notes

The patch backported for CVE-2006-5051 was incorrect and did not
fully address the issue. The upstream fix in 4.4p1 was
right, and it the next unstable upload after that was 4.6p1.