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Gentoo Linux Security Advisory                           GLSA 201101-03
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: libvpx: User-assisted execution of arbitrary code
      Date: January 15, 2011
      Bugs: #345559
        ID: 201101-03

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Synopsis
========

Timothy B. Terriberry discovered that libvpx contains an integer
overflow vulnerability in the processing of video streams that may
allow user-assisted execution of arbitrary code.

Background
==========

libvpx is the VP8 codec SDK used to encode and decode video streams,
typically within a WebM format media file.

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

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  media-libs/libvpx       < 0.9.5                          >= 0.9.5

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

libvpx is vulnerable to an integer overflow vulnerability when
processing crafted VP8 video streams.

Impact
======

A remote attacker could entice a user to open a specially crafted media
file, possibly resulting in the execution of arbitrary code with the
privileges of the user running the application, or a Denial of Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libvpx users should upgrade to the latest stable version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-libs/libvpx-0.9.5"

Packages which depend on this library may need to be recompiled. Tools
such as revdep-rebuild may assist in identifying some of these
packages.

References
==========

  [ 1 ] CVE-2010-4203
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-4203

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

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

  http://security.gentoo.org/glsa/glsa-201101-03.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
https://bugs.gentoo.org.

License
=======

Copyright 2011 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/2.5