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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/