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Asterisk Project Security Advisory - AST-2011-002

Asterisk Project Security Advisory - AST-2011-002
Posted Feb 22, 2011
Authored by Matthew Nicholson | Site asterisk.org

Asterisk Project Security Advisory - When decoding UDPTL packets, multiple stack and heap based arrays can be made to overflow by specially crafted packets. Systems doing T.38 pass through or termination are vulnerable.

tags | advisory, overflow
SHA-256 | 9b947dd4fce8b8d4d6dc7c6bc47a02bc75f6c9d8097ebaa822eda51e67ad2705

Asterisk Project Security Advisory - AST-2011-002

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               Asterisk Project Security Advisory - AST-2011-002

Product Asterisk
Summary Multiple array overflow and crash vulnerabilities in
UDPTL code
Nature of Advisory Exploitable Stack and Heap Array Overflows
Susceptibility Remote Unauthenticated Sessions
Severity Critical
Exploits Known No
Reported On January 27, 2011
Reported By Matthew Nicholson
Posted On February 21, 2011
Last Updated On February 21, 2011
Advisory Contact Matthew Nicholson <mnicholson@digium.com>
CVE Name

Description When decoding UDPTL packets, multiple stack and heap based
arrays can be made to overflow by specially crafted packets.
Systems doing T.38 pass through or termination are vulnerable.

Resolution The UDPTL decoding routines have been modified to respect the
limits of exploitable arrays.

In asterisk versions not containing the fix for this issue,
disabling T.38 support will prevent this vulnerability from
being exploited. T.38 support can be disabled in chan_sip by
setting the t38pt_udptl option to "no" (it is off by default).

t38pt_udptl = no

The chan_ooh323 module should also be disabled by adding the
following line in modles.conf.

noload => chan_ooh323

Affected Versions
Product Release Series
Asterisk Open Source 1.4.x All versions
Asterisk Open Source 1.6.x All versions
Asterisk Business Edition C.x.x All versions
AsteriskNOW 1.5 All versions
s800i (Asterisk Appliance) 1.2.x All versions

Corrected In
Product Release
Asterisk Open Source 1.4.39.2, 1.6.1.22, 1.6.2.16.2, 1.8.2.4
Asterisk Business Edition C.3.6.3

Patches
URL Branch
http://downloads.asterisk.org/pub/security/AST-2011-002-1.4.diff 1.4
http://downloads.asterisk.org/pub/security/AST-2011-002-1.6.1.diff 1.6.1
http://downloads.asterisk.org/pub/security/AST-2011-002-1.6.2.diff 1.6.2
http://downloads.asterisk.org/pub/security/AST-2011-002-1.8.diff 1.8

Links

Asterisk Project Security Advisories are posted at
http://www.asterisk.org/security

This document may be superseded by later versions; if so, the latest
version will be posted at
http://downloads.digium.com/pub/security/AST-2011-002.pdf and
http://downloads.digium.com/pub/security/AST-2011-002.html

Revision History
Date Editor Revisions Made
02/21/11 Matthew Nicholson Initial Release

Asterisk Project Security Advisory - AST-2011-002
Copyright (c) 2011 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.
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