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Gentoo Linux Security Advisory                           GLSA 200602-01
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: GStreamer FFmpeg plugin: Heap-based buffer overflow
      Date: February 05, 2006
      Bugs: #119512
        ID: 200602-01

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Synopsis
========

The GStreamer FFmpeg plugin is vulnerable to a buffer overflow that may
be exploited by attackers to execute arbitrary code.

Background
==========

The GStreamer FFmpeg plugin uses code from the FFmpeg library to
provide fast colorspace conversion and multimedia decoders to the
GStreamer open source media framework.

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

    -------------------------------------------------------------------
     Package                           /  Vulnerable  /     Unaffected
    -------------------------------------------------------------------
  1  media-plugins/gst-plugins-ffmpeg     < 0.8.7-r1       >= 0.8.7-r1

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

The GStreamer FFmpeg plugin contains derived code from the FFmpeg
library, which is vulnerable to a heap overflow in the
"avcodec_default_get_buffer()" function discovered by Simon Kilvington
(see GLSA 200601-06).

Impact
======

A remote attacker could entice a user to run an application using the
GStreamer FFmpeg plugin on a maliciously crafted PIX_FMT_PAL8 format
image file (like PNG images), possibly leading to 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 GStreamer FFmpeg plugin users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-plugins/gst-plugins-ffmpeg-0.8.7-r1"

References
==========

  [ 1 ] CVE-2005-4048
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-4048
  [ 2 ] GLSA 200601-06
        http://www.gentoo.org/security/en/glsa/glsa-200601-06.xml

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

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

  http://security.gentoo.org/glsa/glsa-200602-01.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