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UNIRAS Brief - 703/06 - Gentoo Linux Security Advisory: GLSA 200610-15 - Asterisk: Multiple vulnerabilities



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______________________________________________________________________________

 UNIRAS (UK Government CERT) Briefing - 703/06 dated 02.11.06 time 12:30
 UNIRAS is part of NISCC (the UK National Infrastructure Security
 Co-ordination Centre)
______________________________________________________________________________

 UNIRAS material is available from the NISCC website at www.niscc.gov.uk
______________________________________________________________________________

Title
=====

Gentoo Linux Security Advisory: GLSA 200610-15 - Asterisk: Multiple vulnerabilities

Detail
======

Asterisk contains buffer overflows in channels/chan_mgcp.c from the
MGCP driver and in channels/chan_skinny.c from the Skinny channel
driver for Cisco SCCP phones. It also dangerously handles
client-controlled variables to determine filenames in the Record()
function. Finally, the SIP channel driver in channels/chan_sip.c could
use more resources than necessary under unspecified circumstances.


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Gentoo Linux Security Advisory                           GLSA 200610-15
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Asterisk: Multiple vulnerabilities
      Date: October 30, 2006
      Bugs: #144941, #151881
        ID: 200610-15

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Synopsis
========

Asterisk is vulnerable to the remote execution of arbitrary code or a
Denial of Service.

Background
==========

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

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

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  net-misc/asterisk      < 1.2.13                         >= 1.2.13

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

Asterisk contains buffer overflows in channels/chan_mgcp.c from the
MGCP driver and in channels/chan_skinny.c from the Skinny channel
driver for Cisco SCCP phones. It also dangerously handles
client-controlled variables to determine filenames in the Record()
function. Finally, the SIP channel driver in channels/chan_sip.c could
use more resources than necessary under unspecified circumstances.

Impact
======

A remote attacker could execute arbitrary code by sending a crafted
audit endpoint (AUEP) response, by sending an overly large Skinny
packet even before authentication, or by making use of format strings
specifiers through the client-controlled variables. An attacker could
also cause a Denial of Service by resource consumption through the SIP
channel driver.

Workaround
==========

There is no known workaround for the format strings vulnerability at
this time. You can comment the lines in /etc/asterisk/mgcp.conf,
/etc/asterisk/skinny.conf and /etc/asterisk/sip.conf to deactivate the
three vulnerable channel drivers. Please note that the MGCP channel
driver is disabled by default.

Resolution
==========

All Asterisk users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/asterisk-1.2.13"

References
==========

  [ 1 ] CVE-2006-4345
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4345
  [ 2 ] CVE-2006-4346
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4346
  [ 3 ] CVE-2006-5444
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5444
  [ 4 ] CVE-2006-5445
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5445

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

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

  http://security.gentoo.org/glsa/glsa-200610-15.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@xxxxxxxxxx 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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______________________________________________________________________________

UNIRAS wishes to acknowledge the contributions of Gentoo for the
information contained in this briefing.
______________________________________________________________________________

This notice contains information released by the original author.
Some of the information may have changed since it was released. If the
vulnerability affects you, it may be prudent to retrieve the advisory
from the site of the original source to ensure that you receive the most
current information concerning that problem.

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______________________________________________________________________________

<End of UNIRAS Briefing>

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