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Gentoo Linux Security Advisory GLSA 202208-33
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https://security.gentoo.org/
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Severity: Normal
Title: Gnome Shell, gettext, libcroco: Multiple Vulnerabilities
Date: August 21, 2022
Bugs: #722752, #755848, #769998
ID: 202208-33

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Synopsis
========

A vulnerability has been found in libcroco which could result in denial
of service.

Background
==========

GNOME Shell provides core user interface functions for the GNOME
desktop, like switching to windows and launching applications.

gettext contains the GNU locale utilities.

libcroco is a standalone CSS2 parsing and manipulation library.

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-libs/libcroco < 0.6.13 >= 0.6.13
2 gnome-base/gnome-shell < 3.36.7 >= 3.36.7
3 sys-devel/gettext < 0.21 >= 0.21

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

The cr_parser_parse_any_core function in libcroco's cr-parser.c does not
limit recursion, leading to a denial of service via a stack overflow
when trying to parse crafted CSS.

Gnome Shell and gettext bundle libcroco in their own sources and thus
are potentially vulnerable as well.

Impact
======

An attacker with control over the input to the library can cause a denial of service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All gettext users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-devel/gettext-0.21"

All Gnome Shell users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=gnome-base/gnome-shell-3.36.7"

All libcroco users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/libcroco-0.6.13"

References
==========

[ 1 ] CVE-2020-12825
https://nvd.nist.gov/vuln/detail/CVE-2020-12825

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

https://security.gentoo.org/glsa/202208-33

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

License
=======

Copyright 2022 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5
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