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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2010.0111 Asterisk T.38 Remote Crash Vulnerability 4 February 2010 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Asterisk Publisher: Asterisk Operating System: UNIX variants (UNIX, Linux, OSX) Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2010-0441 Original Bulletin: http://downloads.asterisk.org/pub/security/AST-2010-001 - --------------------------BEGIN INCLUDED TEXT-------------------- Asterisk Project Security Advisory - AST-2010-001 +------------------------------------------------------------------------+ | Product | Asterisk | |----------------------+-------------------------------------------------| | Summary | T.38 Remote Crash Vulnerability | |----------------------+-------------------------------------------------| | Nature of Advisory | Denial of Service | |----------------------+-------------------------------------------------| | Susceptibility | Remote unauthenticated sessions | |----------------------+-------------------------------------------------| | Severity | Critical | |----------------------+-------------------------------------------------| | Exploits Known | No | |----------------------+-------------------------------------------------| | Reported On | 12/03/09 | |----------------------+-------------------------------------------------| | Reported By | issues.asterisk.org users bklang and elsto | |----------------------+-------------------------------------------------| | Posted On | 02/03/10 | |----------------------+-------------------------------------------------| | Last Updated On | February 2, 2010 | |----------------------+-------------------------------------------------| | Advisory Contact | David Vossel < dvossel AT digium DOT com > | |----------------------+-------------------------------------------------| | CVE Name | CVE-2010-0441 | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Description | An attacker attempting to negotiate T.38 over SIP can | | | remotely crash Asterisk by modifying the FaxMaxDatagram | | | field of the SDP to contain either a negative or | | | exceptionally large value. The same crash occurs when | | | the FaxMaxDatagram field is omitted from the SDP as | | | well. | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Resolution | Upgrade to one of the versions of Asterisk listed in the | | | "Corrected In" section, or apply a patch specified in the | | | "Patches" section. | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Affected Versions | |------------------------------------------------------------------------| | Product | Release Series | | |----------------------------------+----------------+--------------------| | Asterisk Open Source | 1.6.x | All versions | |----------------------------------+----------------+--------------------| | Asterisk Business Edition | C.3 | All versions | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Corrected In | |------------------------------------------------------------------------| | Product | Release | |------------------------------------------+-----------------------------| | Asterisk Open Source | 1.6.0.22 | |------------------------------------------+-----------------------------| | Asterisk Open Source | 1.6.1.14 | |------------------------------------------+-----------------------------| | Asterisk Open Source | 1.6.2.2 | |------------------------------------------+-----------------------------| | | C.3.3.2 | +------------------------------------------------------------------------+ +-------------------------------------------------------------------------+ | Patches | |-------------------------------------------------------------------------| | SVN URL |Branch| |------------------------------------------------------------------+------| |http://downloads.asterisk.org/pub/security/AST-2010-001-1.6.0.diff|v1.6.0| |------------------------------------------------------------------+------| |http://downloads.asterisk.org/pub/security/AST-2010-001-1.6.1.diff|v1.6.1| |------------------------------------------------------------------+------| |http://downloads.asterisk.org/pub/security/AST-2010-001-1.6.2.diff|v1.6.2| +-------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Links | https://issues.asterisk.org/view.php?id=16634 | | | | | | https://issues.asterisk.org/view.php?id=16724 | | | | | | https://issues.asterisk.org/view.php?id=16517 | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | 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/.pdf and | | http://downloads.digium.com/pub/security/.html | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Revision History | |------------------------------------------------------------------------| | Date | Editor | Revisions Made | |----------------+----------------------+--------------------------------| | 02/02/10 | David Vossel | Initial release | +------------------------------------------------------------------------+ Asterisk Project Security Advisory - AST-2010-001 Copyright (c) 2010 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. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== 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 iD8DBQFLagVr/iFOrG6YcBERAtEoAJ0YJXJ8ayzjyLG95ZPRAAs/sYb6nACfb63w thad4oElqowpcRPQ2aHZGAg= =TNO9 -----END PGP SIGNATURE-----