CVE-2023-0494

Name	CVE-2023-0494
Description	A vulnerability was found in X.Org. This issue occurs due to a dangling pointer in DeepCopyPointerClasses that can be exploited by ProcXkbSetDeviceInfo() and ProcXkbGetDeviceInfo() to read and write into freed memory. This can lead to local privilege elevation on systems where the X server runs privileged and remote code execution for ssh X forwarding sessions.
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-3310-1, DSA-5342-1
Debian Bugs	1030777

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+deb10u9	fixed
	bullseye	2:1.20.11-1+deb11u3	vulnerable
	bullseye (security)	2:1.20.11-1+deb11u6	fixed
	bookworm, sid	2:21.1.7-2	fixed
xwayland (PTS)	bookworm	2:22.1.8-1	fixed
	sid	2:22.1.9-1	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+deb10u8	DLA-3310-1
xorg-server	source	bullseye	2:1.20.11-1+deb11u5	DSA-5342-1
xorg-server	source	(unstable)	2:21.1.7-1		1030777
xwayland	source	(unstable)	2:22.1.8-1

https://www.openwall.com/lists/oss-security/2023/02/07/1
https://gitlab.freedesktop.org/xorg/xserver/commit/0ba6d8c37071131a49790243cdac55392ecf71ec