AST-2014-012: Mixed IP address families in access control lists may permit unwanted traffic.

 Asterisk Project Security Advisory - AST-2014-012

         Product        Asterisk
         Summary        Mixed IP address families in access control lists
                        may permit unwanted traffic.
    Nature of Advisory  Unauthorized Access
      Susceptibility    Remote unauthenticated sessions
         Severity       Moderate
      Exploits Known    No
       Reported On      25 October, 2014
       Reported By      Andreas Steinmetz
        Posted On       20 November, 2014
     Last Updated On    November 20, 2014
     Advisory Contact   Mark Michelson <mmichelson AT digium DOT com>
         CVE Name       Pending


    Description  Many modules in Asterisk that service incoming IP traffic
                 have ACL options ("permit" and "deny") that can be used to
                 whitelist or blacklist address ranges. A bug has been
                 discovered where the address family of incoming packets is
                 only compared to the IP address family of the first entry
                 in the list of access control rules. If the source IP
                 address for an incoming packet is not of the same address
                 family as the first ACL entry, that packet bypasses all ACL
                 rules. For ACLs whose rules are all of the same address
                 family, there is no issue.

                 Note that while the incoming packet may bypass ACL rules,
                 the packet is still subject to any authentication
                 requirements that the specific protocol employs.

                 This issue affects the following parts of Asterisk

                   * All VoIP channel drivers

                   * DUNDi

                   * Asterisk Manager Interface (AMI)

    Resolution  The ACL code has been amended to compare the incoming
                packet's source address family against the address families
                for all rules.

                               Affected Versions
                         Product                       Release
                                                       Series
                  Asterisk Open Source                  1.8.x   All versions
                  Asterisk Open Source                  11.x    All versions
                  Asterisk Open Source                  12.x    All versions
                  Asterisk Open Source                  13.x    All versions
                   Certified Asterisk                  1.8.28   All versions
                   Certified Asterisk                   11.6    All versions

                                  Corrected In
          Product                              Release
    Asterisk Open Source          1.8.32.1, 11.14.1, 12.7.1, 13.0.1
     Certified Asterisk                1.8.28-cert3, 11.6-cert8

                                      Patches
                                 SVN URL                               Revision
   http://downloads.asterisk.org/pub/security/AST-2014-012-1.8.diff    Asterisk
                                                                       1.8
   http://downloads.asterisk.org/pub/security/AST-2014-012-1.8.28.diff Certified
                                                                       Asterisk
                                                                       1.8.28
   http://downloads.asterisk.org/pub/security/AST-2014-012-11.diff     Asterisk
                                                                       11
   http://downloads.asterisk.org/pub/security/AST-2014-012-11.6.diff   Certified
                                                                       Asterisk
                                                                       11.6
   http://downloads.asterisk.org/pub/security/AST-2014-012-12.diff     Asterisk
                                                                       12
   http://downloads.asterisk.org/pub/security/AST-2014-012-13.diff     Asterisk
                                                                       13

    Links  https://issues.asterisk.org/jira/browse/ASTERISK-24469

    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-2014-012.pdf and
    http://downloads.digium.com/pub/security/AST-2014-012.html

                                Revision History
          Date            Editor                  Revisions Made
    5 November, 2014  Mark Michelson  Initial Advisory created

               Asterisk Project Security Advisory - AST-2014-012
              Copyright (c) 2014 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.