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             AUSCERT External Security Bulletin Redistribution

       AST-2019-004: A vulnerability has been identified in Asterisk
                             6 September 2019


        AusCERT Security Bulletin Summary

Product:           Asterisk
Publisher:         Asterisk
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-15297  

Original Bulletin: 

- --------------------------BEGIN INCLUDED TEXT--------------------

Asterisk Project Security Advisory - AST-2019-004

       Product         Asterisk

       Summary         Crash when negotiating for T.38 with a declined stream

 Nature of Advisory    Remote Crash

   Susceptibility      Remote Authenticated Sessions

      Severity         Minor

   Exploits Known      No

     Reported On       August 05, 2019

     Reported By       Alexei Gradinari

      Posted On        September 05, 2019

   Last Updated On     September 4, 2019

  Advisory Contact     kharwell AT sangoma DOT com

      CVE Name         CVE-2019-15297

     Description       When Asterisk sends a re-invite initiating T.38 faxing, and the endpoint
                       responds with a declined media stream a crash will then occur in Asterisk.

  Modules Affected     res_pjsip_t38.c

     Resolution        If T.38 faxing is not required then setting the   t38_udptl   configuration
                       option on the endpoint to   no   disables this functionality. This option
                       defaults to   no   so you have to have explicitly set it   yes   to potentially
                       be affected by this issue.

                       Otherwise, if T.38 faxing is required then Asterisk should be upgraded to a
                       fixed version.

                               Affected Versions

              Product                  Release

       Asterisk Open Source             15.x      All releases

       Asterisk Open Source             16.x      All releases

                                 Corrected In

                     Product                                             Release

               Asterisk Open Source                                   15.7.4,16.5.1


                     SVN URL                                             Revision

http://downloads.asterisk.org/pub/security/         Asterisk 15

http://downloads.asterisk.org/pub/security/         Asterisk 16

        Links          https://issues.asterisk.org/jira/browse/ASTERISK-28495

Asterisk Project Security Advisories are posted at http://www.asterisk.org/

This document may be superseded by later versions; if so, the latest version
will be posted at http://downloads.digium.com/pub/security/ AST-2019-004 .pdf
and http://downloads.digium.com/pub/security/ AST-2019-004 .html

                               Revision History

       Date                   Editor                                Revisions Made

August 28, 2019      Kevin Harwell              Initial revision

               Asterisk Project Security Advisory - AST-2019-004
              Copyright (C) 2019 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.

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