[ GLSA 200606-15 ] Asterisk: IAX2 video frame buffer overflow

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200606-15
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Asterisk: IAX2 video frame buffer overflow
      Date: June 14, 2006
      Bugs: #135680
        ID: 200606-15

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Synopsis
========

Asterisk contains a bug in the IAX2 channel driver making it vulnerable
to the remote execution of arbitrary code.

Background
==========

Asterisk is an open source implementation of a telephone private branch
exchange (PBX).

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

    -------------------------------------------------------------------
     Package            /   Vulnerable   /                  Unaffected
    -------------------------------------------------------------------
  1  net-misc/asterisk      < 1.0.11_p1                   >= 1.0.11_p1

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

Asterisk fails to properly check the length of truncated video frames
in the IAX2 channel driver which results in a buffer overflow.

Impact
======

An attacker could exploit this vulnerability by sending a specially
crafted IAX2 video stream resulting in the execution of arbitrary code
with the permissions of the user running Asterisk.

Workaround
==========

Disable public IAX2 support.

Resolution
==========

All Asterisk users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/asterisk-1.0.11_p1"

References
==========

  [ 1 ] CVE-2006-2898
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2898
  [ 2 ] Corelabs Asterisk PBX truncated video frame vulnerability advisory
        http://www.coresecurity.com/common/showdoc.php?idx=547&idxseccion=10

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

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

  http://security.gentoo.org/glsa/glsa-200606-15.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/2.5

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