CVE-2024-31083

NameCVE-2024-31083
DescriptionA use-after-free vulnerability was found in the ProcRenderAddGlyphs() function of Xorg servers. This issue occurs when AllocateGlyph() is called to store new glyphs sent by the client to the X server, potentially resulting in multiple entries pointing to the same non-refcounted glyphs. Consequently, ProcRenderAddGlyphs() may free a glyph, leading to a use-after-free scenario when the same glyph pointer is subsequently accessed. This flaw allows an authenticated attacker to execute arbitrary code on the system by sending a specially crafted request.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3787-1, DSA-5657-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
xorg-server (PTS)buster2:1.20.4-1+deb10u4vulnerable
buster (security)2:1.20.4-1+deb10u14fixed
bullseye2:1.20.11-1+deb11u11vulnerable
bullseye (security)2:1.20.11-1+deb11u13fixed
bookworm2:21.1.7-3+deb12u5vulnerable
bookworm (security)2:21.1.7-3+deb12u7fixed
sid, trixie2:21.1.12-1fixed
xwayland (PTS)bookworm2:22.1.9-1vulnerable
sid, trixie2:24.1.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
xorg-serversourcebuster2:1.20.4-1+deb10u14DLA-3787-1
xorg-serversourcebullseye2:1.20.11-1+deb11u13DSA-5657-1
xorg-serversourcebookworm2:21.1.7-3+deb12u7DSA-5657-1
xorg-serversource(unstable)2:21.1.11-3
xwaylandsource(unstable)2:23.2.6-1

Notes

[bookworm] - xwayland <no-dsa> (Minor issue; Xwayland shouldn't be running as root)
Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/bdca6c3d1f5057eeb31609b1280fc93237b00c77
https://lists.x.org/archives/xorg-announce/2024-April/003497.html
Followup to fix regression: https://gitlab.freedesktop.org/xorg/xserver/-/commit/337d8d48b618d4fc0168a7b978be4c3447650b04

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