CVE-2022-46340

Name	CVE-2022-46340
Description	A vulnerability was found in X.Org. The issue occurs due to the swap handler for the XTestFakeInput request of the XTest extension, possibly corrupting the stack if GenericEvents with lengths larger than 32 bytes are sent through the XTestFakeInput request. This flaw can lead to local privilege elevation on systems where the X server runs privileged and remote code execution for ssh X forwarding sessions. This issue does not affect systems where the client and server use the same byte order.
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	DLA-3256-1, DSA-5304-1
Debian Bugs	1026071

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
xorg-server (PTS)	buster	2:1.20.4-1+deb10u4	vulnerable
	buster (security)	2:1.20.4-1+deb10u7	fixed
	bullseye	2:1.20.11-1+deb11u3	vulnerable
	bullseye (security)	2:1.20.11-1+deb11u4	fixed
	bookworm, sid	2:21.1.6-1	fixed
xwayland (PTS)	bookworm, sid	2:22.1.7-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
xorg-server	source	buster	2:1.20.4-1+deb10u7	DLA-3256-1
xorg-server	source	bullseye	2:1.20.11-1+deb11u4	DSA-5304-1
xorg-server	source	(unstable)	2:21.1.5-1		1026071
xwayland	source	(unstable)	2:22.1.6-1

Notes

https://lists.x.org/archives/xorg-announce/2022-December/003302.html
https://gitlab.freedesktop.org/xorg/xserver/commit/b320ca0ffe4c0c872eeb3a93d9bde21f765c7c63