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AST-2013-004: Remote Crash From Late Arriving SIP ACK With SDP

From: Asterisk Security Team (securityasterisk.org)
Date: Tue Aug 27 2013 - 19:26:07 CDT

               Asterisk Project Security Advisory - AST-2013-004

          Product Asterisk
          Summary Remote Crash From Late Arriving SIP ACK With SDP
     Nature of Advisory Remote Crash
       Susceptibility Remote Unauthenticated Sessions
          Severity Major
       Exploits Known None
        Reported On February 11, 2013
        Reported By Colin Cuthbertson
         Posted On August 27, 2013
      Last Updated On August 27, 2013
      Advisory Contact Joshua Colp <jcolp AT digium DOT com>
          CVE Name Pending

    Description A remotely exploitable crash vulnerability exists in the
                 SIP channel driver if an ACK with SDP is received after the
                 channel has been terminated. The handling code incorrectly
                 assumes that the channel will always be present.

    Resolution A check has now been added which only parses SDP and applies
                it if an Asterisk channel is present.
                Note that Walter Doekes, OSSO B.V., is responsible for
                diagnosing and providing the fix for this issue.

                               Affected Versions
              Product Release Series
        Asterisk Open Source 1.8.x and above
        Asterisk Open Source 11.x All versions
         Certified Asterisk 1.8.15 All versions
         Certified Asterisk 11.2 All versions

                                  Corrected In
                 Product Release
          Asterisk Open Source, 11.5.1
           Certified Asterisk 1.8.15-cert3, 11.2-cert2

                                SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2013-004-1.8.diff Asterisk
http://downloads.asterisk.org/pub/security/AST-2013-004-11.diff Asterisk
http://downloads.asterisk.org/pub/security/AST-2013-004-1.8.15-cert.diff Certified
http://downloads.asterisk.org/pub/security/AST-2013-004-11.2-cert.diff Certified

       Links https://issues.asterisk.org/jira/browse/ASTERISK-21064

    Asterisk Project Security Advisories are posted at
    This document may be superseded by later versions; if so, the latest
    version will be posted at
    http://downloads.digium.com/pub/security/AST-2013-004.pdf and

                                Revision History
          Date Editor Revisions Made
    2013-08-22 Joshua Colp Initial revision.

               Asterisk Project Security Advisory - AST-2013-004
              Copyright (c) 2013 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.