Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2011.0203
Asterisk Project Security Advisory - AST-2011-002
23 February 2011
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Asterisk
Publisher: Digium
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
Original Bulletin:
http://downloads.asterisk.org/pub/security/AST-2011-002.html
- --------------------------BEGIN INCLUDED TEXT--------------------
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.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iD8DBQFNZEqZ/iFOrG6YcBERAhklAJ90hja/qBSrGQFcSkrdgxjrwre4NACgqdnB
y0xVjXH7I72FbsT0dV3KgBI=
=m/Eo
-----END PGP SIGNATURE-----