Gentoo: GLSA-202012-12: libass: User-assisted execution of arbitrary code

Date 23 Dec 2020

Category Gentoo Linux Distribution - Security Advisories

228

Posted By LinuxSecurity Advisories

A vulnerability has been found in libass that could allow a remote attacker to execute arbitrary code.

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Gentoo Linux Security Advisory                           GLSA 202012-12
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: libass: User-assisted execution of arbitrary code
      Date: December 23, 2020
      Bugs: #746413
        ID: 202012-12

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Synopsis
========

A vulnerability has been found in libass that could allow a remote
attacker to execute arbitrary code.

Background
==========

libass is a portable subtitle renderer for the ASS/SSA (Advanced
Substation Alpha/Substation Alpha) subtitle format.

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

     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  media-libs/libass            < 0.15.0                  >= 0.15.0

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

It was discovered that libass did not properly handle Advanced
Substation Alpha/Substation Alpha subtitle format files.

Impact
======

A remote attacker could entice a user to process an a specially crafted
subtitle format file using an application linked against libass,
possibly resulting in execution of arbitrary code with the privileges
of the process or a Denial of Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libass users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=media-libs/libass-0.15.0"

References
==========

[ 1 ] CVE-2020-26682
       https://nvd.nist.gov/vuln/detail/CVE-2020-26682

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

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

  https://security.gentoo.org/glsa/202012-12

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
This email address is being protected from spambots. You need JavaScript enabled to view it. or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2020 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