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Gentoo Linux Security Advisory                        GLSA 200806-09:02
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: libvorbis: Multiple vulnerabilities
      Date: June 23, 2008
   Updated: June 23, 2008
      Bugs: #222085
        ID: 200806-09:02

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Synopsis
========

Multiple vulnerabilities in libvorbis might lead to the execution of
arbitrary code.

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      < 1.2.1_rc1                >= 1.2.1_rc1

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

Will Drewry of the Google Security Team reported multiple
vulnerabilities in libvorbis:

* A zero value for "codebook.dim" is not properly handled, leading to
  a crash, infinite loop or triggering an integer overflow
  (CVE-2008-1419).

* An integer overflow in "residue partition value" evaluation might
  lead to a heap-based buffer overflow (CVE-2008-1420).

* An integer overflow in a certain "quantvals" and "quantlist"
  calculation might lead to a heap-based buffer overflow
  (CVE-2008-1423).

Impact
======

A remote attacker could exploit these vulnerabilities by enticing a
user to open a specially crafted Ogg Vorbis file or network stream with
an application using libvorbis. This might lead to the execution of
arbitrary code with the privileges of the user playing the file or a
Denial of Service by a crash or CPU consumption.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libvorbis users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot -v ">=media-libs/libvorbis-1.2.1_rc1"

References
==========

  [ 1 ] CVE-2008-1419
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1419
  [ 2 ] CVE-2008-1420
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1420
  [ 3 ] CVE-2008-1423
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1423

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

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

  http://security.gentoo.org/glsa/glsa-200806-09.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 2008 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

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