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AST-2013-006: Buffer Overflow when receiving odd length 16 bit SMS message

From: Asterisk Security Team (securityasterisk.org)
Date: Mon Dec 16 2013 - 16:39:36 CST

               Asterisk Project Security Advisory - AST-2013-006

         Product Asterisk
         Summary Buffer Overflow when receiving odd length 16 bit SMS
    Nature of Advisory Buffer Overflow and Remote Crash
      Susceptibility Remote SMS Messages
         Severity Major
      Exploits Known None
       Reported On September 26, 2013
       Reported By Jan Juergens
        Posted On December 16, 2013
     Last Updated On December 16, 2013
     Advisory Contact Scott Griepentrog <sgriepentrog AT digium DOT com>
         CVE Name Pending

    Description A 16 bit SMS message that contains an odd message length
                 value will cause the message decoding loop to run forever.
                 The message buffer is not on the stack but will be
                 overflowed resulting in corrupted memory and an immediate

    Resolution This patch corrects the evaluation of the message length
                indicator, ensuring that the message decoding loop will stop
                at the end of the received message.
                Thanks to Jan Juergens for finding, reporting, testing, and
                providing a fix for this problem.

                               Affected Versions
                Product Release Series
         Asterisk Open Source 1.8.x All Versions
         Asterisk Open Source 10.x All Versions
      Asterisk with Digiumphones 10.x-digiumphones All Versions
         Asterisk Open Source 11.x All Versions
          Certified Asterisk 1.8.x All Versions
          Certified Asterisk 11.x All Versions

                                  Corrected In
                  Product Release
            Asterisk Open Source, 10.12.4, 11.6.1
         Asterisk with Digiumphones 10.12.4-digiumphones
             Certified Asterisk 1.8.15-cert4, 11.2-cert3

                                  SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2013-006-1.8.diff Asterisk 1.8
http://downloads.asterisk.org/pub/security/AST-2013-006-10.diff Asterisk 10
http://downloads.asterisk.org/pub/security/AST-2013-006-10-digiumphones.diff Asterisk
http://downloads.asterisk.org/pub/security/AST-2013-006-11.diff Asterisk 11
http://downloads.asterisk.org/pub/security/AST-2013-006-1.8.15.diff Certified
                                                                             Asterisk 1.8.15
http://downloads.asterisk.org/pub/security/AST-2013-006-11.2.diff Certified
                                                                             Asterisk 11.2

       Links https://issues.asterisk.org/jira/browse/ASTERISK-22590

    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-2013-006.pdf and

                                Revision History
          Date Editor Revisions Made
    12/16/2013 Scott Griepentrog Initial Revision

               Asterisk Project Security Advisory - AST-2013-006
              Copyright (c) 2013 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.