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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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