DescriptionA heap-based buffer over-read vulnerability was found in the server's ProcAppleDRICreatePixmap() function. This issue occurs when byte-swapped length values are used in replies, potentially leading to memory leakage and segmentation faults, particularly when triggered by a client with a different endianness. This vulnerability could be exploited by an attacker to cause the X server to read heap memory values and then transmit them back to the client until encountering an unmapped page, resulting in a crash. Despite the attacker's inability to control the specific memory copied into the replies, the small length values typically stored in a 32-bit integer can result in significant attempted out-of-bounds reads.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

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+deb10u14vulnerable
bullseye (security)2:1.20.11-1+deb11u13fixed
bookworm (security)2:21.1.7-3+deb12u7fixed
sid, trixie2:21.1.12-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


Fixed by:
Affects the XQuartz (X11 server and client libraries for macOS) component

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