CVE-2019-16905

Name	CVE-2019-16905
Description	OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-authentication integer overflow if a client or server is configured to use a crafted XMSS key. This leads to memory corruption and local code execution because of an error in the XMSS key parsing algorithm. NOTE: the XMSS implementation is considered experimental in all released OpenSSH versions, and there is no supported way to enable it when building portable OpenSSH.
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)

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	vulnerable
	buster (security)	1:7.9p1-10+deb10u1	vulnerable
	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
openssh	source	jessie	(not affected)
openssh	source	stretch	(not affected)
openssh	source	(unstable)	1:8.1p1-1	unimportant

Notes

[stretch] - openssh <not-affected> (Vulnerable code introduced later)
[jessie] - openssh <not-affected> (Vulnerable code introduced later)
Issue in experimental (and not enabled) XMSS implementation; futhermore there
is not supported way to enable it when building openssh.