AST-2014-009: Remote crash based on malformed SIP subscription requests

Asterisk Project Security Advisory - AST-2014-009

         Product        Asterisk
         Summary        Remote crash based on malformed SIP subscription
                        requests
    Nature of Advisory  Remotely triggered crash of Asterisk
      Susceptibility    Remote authenticated sessions
         Severity       Major
      Exploits Known    No
       Reported On      30 July, 2014
       Reported By      Mark Michelson
        Posted On       18 September, 2014
     Last Updated On    September 18, 2014
     Advisory Contact   Mark Michelson <mmichelson AT digium DOT com>
         CVE Name       Pending

    Description  It is possible to trigger a crash in Asterisk by sending a
                 SIP SUBSCRIBE request with unexpected mixes of headers for
                 a given event package. The crash occurs because Asterisk
                 allocates data of one type at one layer and then interprets
                 the data as a separate type at a different layer. The crash
                 requires that the SUBSCRIBE be sent from a configured
                 endpoint, and the SUBSCRIBE must pass any authentication
                 that has been configured.

                 Note that this crash is Asterisk's PJSIP-based
                 res_pjsip_pubsub module and not in the old chan_sip module.

    Resolution  Type-safety has been built into the pubsub API where it
                previously was absent. A test has been added to the
                testsuite that previously would have triggered the crash.

                               Affected Versions
                        Product                       Release
                                                      Series
                  Asterisk Open Source                 1.8.x   Unaffected
                  Asterisk Open Source                 11.x    Unaffected
                  Asterisk Open Source                 12.x    12.1.0 and up
                   Certified Asterisk                 1.8.15   Unaffected
                   Certified Asterisk                  11.6    Unaffected

                                  Corrected In
                         Product                              Release
                  Asterisk Open Source                        12.5.1

                                    Patches
                                SVN URL                              Revision
   http://downloads.asterisk.org/pub/security/AST-2014-009-12.diff   Asterisk
                                                                     12

    Links  https://issues.asterisk.org/jira/browse/ASTERISK-24136

    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-2014-009.pdf and
    http://downloads.digium.com/pub/security/AST-2014-009.html

                                Revision History
         Date            Editor                  Revisions Made
    19 August, 2014  Mark Michelson  Initial version of document

               Asterisk Project Security Advisory - AST-2014-009
              Copyright (c) 2014 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.