Subject: [ASA-202012-19] gdk-pixbuf2: denial of service

Arch Linux Security Advisory ASA-202012-19
==========================================

Severity: Medium
Date    : 2020-12-09
CVE-ID  : CVE-2020-29385
Package : gdk-pixbuf2
Type    : denial of service
Remote  : No
Link    : https://security.archlinux.org/AVG-1328

Summary
=======

The package gdk-pixbuf2 before version 2.42.2-1 is vulnerable to denial
of service.

Resolution
==========

Upgrade to 2.42.2-1.

# pacman -Syu "gdk-pixbuf2>=2.42.2-1"

The problem has been fixed upstream in version 2.42.2.

Workaround
==========

None.

Description
===========

A security issue was found in gdk-pixbuf2 2.40.0 up to 2.42.0. A
malformed GIF image could lead to an endless loop in the write_indexes
function in gdk-pixbuf/lzw.c, taking full CPU resources and leading to
a denial of service.

Impact
======

An attacker might be able to cause a denial of service via a crafted
GIF image.

References
==========

https://mail.gnome.org/archives/distributor-list/2020-December/msg00000.html
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/issues/164
https://gitlab.gnome.org/GNOME/gdk-pixbuf/uploads/2838c96bb111a93d845b95c53b8953e3/gif_lzw_PoC.tar.gz
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/merge_requests/92
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/bdd3acbd48a575d418ba6bf1b32d7bda2fae1c81
https://security.archlinux.org/CVE-2020-29385