AST-2017-001: Buffer overflow in CDR's set user

Asterisk Project Security Advisory - AST-2017-001

         Product        Asterisk
         Summary        Buffer overflow in CDR's set user
    Nature of Advisory  Buffer Overflow
      Susceptibility    Remote Authenticated Sessions
         Severity       Moderate
      Exploits Known    No
       Reported On      March 27, 2017
       Reported By      Alex Villacis Lasso
        Posted On
     Last Updated On    April 4, 2017
     Advisory Contact   kharwell AT digium DOT com
         CVE Name

    Description  No size checking is done when setting the user field on a
                 CDR. Thus, it is possible for someone to use an arbitrarily
                 large string and write past the end of the user field
                 storage buffer. This allows the possibility of remote code
                 injection.

                 This currently affects any system using CDR's that also
                 make use of the following:

                 * The 'X-ClientCode' header within a SIP INFO message when
                 using chan_sip and

                 the 'useclientcode' option is enabled (note, it's disabled
                 by default).

                 * The CDR dialplan function executed from AMI when setting
                 the user field.

                 * The AMI Monitor action when using a long file name/path.

    Resolution  The CDR engine now only copies up to the maximum allowed
                characters into the user field. Any characters outside the
                maximum are truncated.

                               Affected Versions
                         Product                       Release
                                                       Series
                  Asterisk Open Source                  13.x    All Releases
                  Asterisk Open Source                  14.x    All Releases
                   Certified Asterisk                   13.13   All Releases

                                  Corrected In
                            Product                              Release
                      Asterisk Open Source                    13.14.1,14.3.1
                       Certified Asterisk                      13.13-cert3

                                     Patches
                                SVN URL                               Revision
   http://downloads.asterisk.org/pub/security/AST-2017-001-13.diff    Asterisk
                                                                      13
   http://downloads.asterisk.org/pub/security/AST-2017-001-14.diff    Asterisk
                                                                      14
   http://downloads.asterisk.org/pub/security/AST-2017-001-13.13.diff Certified
                                                                      Asterisk
                                                                      13.13

    Links  https://issues.asterisk.org/jira/browse/ASTERISK-26897

    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-2017-001.pdf and
    http://downloads.digium.com/pub/security/AST-2017-001.html

                                Revision History
         Date           Editor                   Revisions Made
    March, 27, 2017  Kevin Harwell  Initial Revision

               Asterisk Project Security Advisory - AST-2017-001
               Copyright © 2017 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.