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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.0459 Asterisk Project Security Advisory - AST-2013-002 2 April 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Asterisk Open Source Certified Asterisk Asterisk Digiumphones Publisher: Digium Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2013-2686 Reference: ESB-2013.0019 Original Bulletin: http://downloads.digium.com/pub/security/AST-2013-002.html - --------------------------BEGIN INCLUDED TEXT-------------------- Asterisk Project Security Advisory - AST-2013-002 Product Asterisk Summary Denial of Service in HTTP server Nature of Advisory Denial of Service Susceptibility Remote Unauthenticated Sessions Severity Major Exploits Known None Reported On January 21, 2013 Reported By Christoph Hebeisen, TELUS Security Labs Posted On March 27, 2013 Last Updated On March 27, 2013 Advisory Contact Mark Michelson <mmichelson AT digium DOT com> CVE Name CVE-2013-2686 Description AST-2012-014 [1], fixed in January of this year, contained a fix for Asterisk's HTTP server since it was susceptible to a remotely-triggered crash. The fix put in place fixed the possibility for the crash to be triggered, but a possible denial of service still exists if an attacker sends one or more HTTP POST requests with very large Content-Length values. [1] http://downloads.asterisk.org/pub/security/AST-2012-014.html Resolution Content-Length is now capped at a maximum value of 1024 bytes. Any attempt to send an HTTP POST with content-length greater than this cap will not result in any memory allocated. The POST will be responded to with an HTTP 413 "Request Entity Too Large" response. Affected Versions Product Release Series Asterisk Open Source 1.8.x 1.8.19.1, 1.8.20.0, 1.8.20.1 Asterisk Open Source 10.x 10.11.1, 10.12.0, 10.12.1 Asterisk Open Source 11.x 11.1.2, 11.2.0, 11.2.1 Certified Asterisk 1.8.15 1.8.15-cert1 Asterisk Digiumphones 10.x-digiumphones 10.11.1-digiumphones, 10.12.0-digiumphones, 10.12.1-digiumphones Corrected In Product Release Asterisk Open Source 1.8.20.2, 10.12.2, 11.2.2 Certified Asterisk 1.8.15-cert2 Asterisk Digiumphones 10.12.2-digiumphones Patches SVN URL Revision http://downloads.asterisk.org/pub/security/AST-2012-014-1.8.diff Asterisk 1.8 http://downloads.asterisk.org/pub/security/AST-2012-014-10.diff Asterisk 10 http://downloads.asterisk.org/pub/security/AST-2012-014-11.diff Asterisk 11 http://downloads.asterisk.org/pub/security/AST-2012-014-1.8.15-cert.diff Certified Asterisk 1.8.15 +------------------------------------------------------------------------+ | Links | https://issues.asterisk.org/jira/browse/ASTERISK-20967 | | | http://telussecuritylabs.com/threats/show/TSL20130327-01 | +------------------------------------------------------------------------+ 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-2013-002.pdf and http://downloads.digium.com/pub/security/AST-2013-002.html Revision History Date Editor Revisions Made February 12, 2013 Mark Michelson Initial Draft March 27, 2013 Matt Jordan Updated CVE Asterisk Project Security Advisory - AST-2013-002 Copyright (c) 2013 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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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUVpFy+4yVqjM2NGpAQLz5A//ZQrxhQef9a0qdr72BbtfaA7uVPKgzNu7 4Tw+9DWiSEMFGuyhMmxB9/JfN3YPxpYreEKpYmqTxfnQg+uM1SxKebu/dfV6u98z /qAHvKRrYWAurn9KVrgP/GXhA4HqCKUkTne7YmW33AiXhd49TlBcdbGEvnVx6Pd2 gWFYVzpKFkQIbBHs36bNPhONhMs6JXG58q7NBNfIINpdN4g390+Q5CTgCQ2pXfNJ JEuZIkTzQd2Kd+n32NBYYyi4tuYlLmorxINqH68TS3bmdeXJYYZPWqA8p2jdc0Nv d1QC0pT0Kkh/LxVetqD5OM1GdfR6DWRnXDCkgpgX1XFOKCHEpkG3SYcM4I7Ko/hJ mdA13oXbzdkd8yisMOAsWjjZsFTZEORpvx3S/lC49n9Ck7PezHoJNqPHugwqykQD +32zLmASEeEImZnDzbWl6S36PCtPfTrsuWd1Z079HnIxB69cZb90gNKR03go7Rk5 f+F97HNcecjvlRZOXiwOm8loGoYxoERIvzv4k+okVpJdubokWylF7lnESm3DmsYB 95lgfMY56i9lUxBI4ZdtbE9ag/QK8Vl4+F78PjmoKjLmAjK/8fFRWECeAQDnyVJ2 Kz3QNHHOs4N12l/cBJCgUfHni/9FqSdANys67wkIdibMRxrsR9jw+o0Fhm0Rp1hJ 8K52uGj4xqg= =+X+L -----END PGP SIGNATURE-----