A new security update has been released for Gentoo Linux - libvorbis: User-assisted execution of arbitrary code. Here the announcement:

Gentoo Linux Security Advisory GLSA 200909-02
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http://security.gentoo.org/
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Severity: Normal
Title: libvorbis: User-assisted execution of arbitrary code
Date: September 07, 2009
Bugs: #280590
ID: 200909-02

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Synopsis
========

A processing error in libvorbis might result in the execution of
arbitrary code or a Denial of Service.

Background
==========

libvorbis is the reference implementation of the Xiph.org Ogg Vorbis
audio file format. It is used by many applications for playback of Ogg
Vorbis files.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 media-libs/libvorbis < 1.2.3 >= 1.2.3

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

Lucas Adamski reported that libvorbis does not correctly process file
headers, related to static mode headers and encoding books.

Impact
======

A remote attacker could entice a user to play a specially crafted OGG
Vorbis file using an application that uses libvorbis, 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 libvorbis users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose =media-libs/libvorbis-1.2.3

References
==========

[ 1 ] CVE-2009-2663
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2663

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

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

http://security.gentoo.org/glsa/glsa-200909-02.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 2009 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