CVE-2021-20240

Name	CVE-2021-20240
Description	A flaw was found in gdk-pixbuf in versions before 2.42.0. An integer wraparound leading to an out of bounds write can occur when a crafted GIF image is loaded. An attacker may cause applications to crash or could potentially execute code on the victim system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Source	CVE (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 Package	Release	Version	Status
gdk-pixbuf (PTS)	jessie, jessie (lts)	2.31.1-2+deb8u10	fixed
	stretch (security)	2.36.5-2+deb9u2	fixed
	stretch (lts), stretch	2.36.5-2+deb9u3	fixed
	buster, buster (lts)	2.38.1+dfsg-1+deb10u1	fixed
	bullseye	2.42.2+dfsg-1+deb11u2	fixed
	bullseye (security)	2.42.2+dfsg-1+deb11u1	fixed
	bookworm	2.42.10+dfsg-1+deb12u1	fixed
	sid, trixie	2.42.12+dfsg-1	fixed

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

Package	Type	Release	Fixed Version
gdk-pixbuf	source	jessie	(not affected)
gdk-pixbuf	source	stretch	(not affected)
gdk-pixbuf	source	buster	(not affected)
gdk-pixbuf	source	(unstable)	2.42.2+dfsg-1

Notes

[buster] - gdk-pixbuf <not-affected> (Vulnerable code introduced later)
[stretch] - gdk-pixbuf <not-affected> (Vulnerable code added later)
https://bugzilla.redhat.com/show_bug.cgi?id=1926787
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/issues/132
Vulnerable code introduced in https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/4e7b5345d2fc8f0d1dee93d8ba9ab805bc95d42f (2.39.2)
Fixed by: https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/086e8adf4cc352cd11572f96066b001b545f354e (2.42.0)
[jessie] - gdk-pixbuf <not-affected> (Vulnerable code added later)