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Gentoo Linux Security Advisory                           GLSA 200802-11
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http://security.gentoo.org/ 
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  Severity: High
     Title: Asterisk: Multiple vulnerabilities
      Date: February 26, 2008
      Bugs: #185713
        ID: 200802-11

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Synopsis
=======
Multiple vulnerabilities have been found in Asterisk.

Background
=========
Asterisk is an open source telephony engine and tool kit.

Affected packages
================
    -------------------------------------------------------------------
     Package            /    Vulnerable    /                Unaffected
    -------------------------------------------------------------------
  1  net-misc/asterisk      < 1.2.21.1-r1                *>= 1.2.17-r1
                                                        >= 1.2.21.1-r1

Description
==========
Multiple vulnerabilities have been found in Asterisk:

* Russel Bryant reported a stack buffer overflow in the IAX2 channel
  driver (chan_iax2) when bridging calls between chan_iax2 and any
  channel driver that uses RTP for media (CVE-2007-3762).

* Chris Clark and Zane Lackey (iSEC Partners) reported a NULL pointer
  dereference in the IAX2 channel driver (chan_iax2) (CVE-2007-3763).

* Will Drewry (Google Security) reported a vulnerability in the
  Skinny channel driver (chan_skinny), resulting in an overly large
  memcpy (CVE-2007-3764).

* Will Drewry (Google Security) reported a vulnerability in the IAX2
  channel driver (chan_iax2), that does not correctly handle
  unauthenticated transactions using a 3-way handshake (CVE-2007-4103).

Impact
=====
By sending a long voice or video RTP frame, a remote attacker could
possibly execute arbitrary code on the target machine. Sending
specially crafted LAGRQ or LAGRP frames containing information elements
of IAX frames, or a certain data length value in a crafted packet, or
performing a flood of calls not completing a 3-way handshake, could
result in a Denial of Service.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All Asterisk users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/asterisk-1.2.17-r1"

References
=========
  [ 1 ] CVE-2007-3762
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3762 
  [ 2 ] CVE-2007-3763
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3763 
  [ 3 ] CVE-2007-3764
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3764 
  [ 4 ] CVE-2007-4103
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4103 

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

http://security.gentoo.org/glsa/glsa-200802-11.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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