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Gentoo Linux Security Advisory                           GLSA 200601-06
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: xine-lib, FFmpeg: Heap-based buffer overflow
      Date: January 10, 2006
      Bugs: #115849, #116181
        ID: 200601-06

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Synopsis
========

xine-lib and FFmpeg are vulnerable to a buffer overflow that may be
exploited by attackers to execute arbitrary code.

Background
==========

xine is a GPL high-performance, portable and reusable multimedia
playback engine. xine-lib is xine's core engine. FFmpeg is a very fast
video and audio converter and is used in xine-lib.

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

    -------------------------------------------------------------------
     Package              /      Vulnerable      /          Unaffected
    -------------------------------------------------------------------
  1  media-libs/xine-lib         < 1.1.1-r3                >= 1.1.1-r3
  2  media-video/ffmpeg       < 0.4.9_p20051216     >= 0.4.9_p20051216
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

Simon Kilvington has reported a vulnerability in FFmpeg libavcodec. The
flaw is due to a buffer overflow error in the
"avcodec_default_get_buffer()" function. This function doesn't properly
handle specially crafted PNG files as a result of a heap overflow.

Impact
======

A remote attacker could entice a user to run an FFmpeg based
application on a maliciously crafted PNG file, resulting in the
execution of arbitrary code with the permissions of the user running
the application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All xine-lib users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-libs/xine-lib-1.1.1-r3"

All FFmpeg users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-video/ffmpeg-0.4.9_p20051216"

References
==========

  [ 1 ] CVE-2005-4048
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-4048
  [ 2 ] Original advisory
        http://article.gmane.org/gmane.comp.video.ffmpeg.devel/26558

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

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

  http://security.gentoo.org/glsa/glsa-200601-06.xml

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
http://bugs.gentoo.org.

License
=======

Copyright 2006 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.

http://creativecommons.org/licenses/by-sa/2.0