A new security update has been released for Gentoo Linux - Asterisk: Multiple vulnerabilities. Here the announcement:

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
=================

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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