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AST-2013-003: Username disclosure in SIP channel driver
From: "Asterisk Security Team" <security () asterisk org>
Date: Wed, 27 Mar 2013 15:55:28 -0500

               Asterisk Project Security Advisory - AST-2013-003

          Product         Asterisk                                            
          Summary         Username disclosure in SIP channel driver           
     Nature of Advisory   Unauthorized data disclosure                        
       Susceptibility     Remote Unauthenticated Sessions                     
          Severity        Moderate                                            
       Exploits Known     No                                                  
        Reported On       January 30, 2013                                    
        Reported By       Walter Doekes, OSSO B.V.                            
         Posted On        February 21, 2013                                   
      Last Updated On     March 27, 2013                                      
      Advisory Contact    Kinsey Moore <kmoore () digium com>                    
          CVE Name        CVE-2013-2264                                       

    Description  When authenticating via SIP with alwaysauthreject enabled,   
                 allowguest disabled, and autocreatepeer disabled, Asterisk   
                 discloses whether a user exists for INVITE, SUBSCRIBE, and   
                 REGISTER transactions in multiple ways.                      
                                                                              
                 This information was disclosed:                              
                                                                              
                 * when a "407 Proxy Authentication Required" response was    
                 sent instead of "401 Unauthorized" response.                 
                                                                              
                 * due to the presence or absence of additional tags at the   
                 end of "403 Forbidden" such as "(Bad auth)".                 
                                                                              
                 * when a "401 Unauthorized" response was sent instead of     
                 "403 Forbidden" response after a retransmission.             
                                                                              
                 * when retransmissions were sent when a matching peer did    
                 not exist, but were not when a matching peer did exist.      

    Resolution  This issue can only be mitigated by upgrading to versions of  
                Asterisk that contain the patch or applying the patch.        

                               Affected Versions
                Product                Release Series    
          Asterisk Open Source              1.8.x        All Versions         
          Asterisk Open Source              10.x         All Versions         
          Asterisk Open Source              11.x         All Versions         
           Certified Asterisk              1.8.15        All Versions         
       Asterisk Business Edition            C.3.x        All Versions         
         Asterisk Digiumphones        10.x-digiumphones  All Versions         

                                  Corrected In
                  Product                              Release                
           Asterisk Open Source               1.8.20.2, 10.12.2, 11.2.2       
           Asterisk Digiumphones                10.12.2-digiumphones          
            Certified Asterisk                      1.8.15-cert2              
         Asterisk Business Edition                     C.3.8.1                

                                     Patches                             
                                SVN URL                                  Revision  
http://downloads.asterisk.org/pub/security/AST-2013-003-1.8.diff         Asterisk  
                                                                         1.8       
http://downloads.asterisk.org/pub/security/AST-2013-003-10.diff          Asterisk  
                                                                         10        
http://downloads.asterisk.org/pub/security/AST-2013-003-11.diff          Asterisk  
                                                                         11        
http://downloads.asterisk.org/pub/security/AST-2013-003-1.8.15-cert.diff Certified 
                                                                         Asterisk  
                                                                         1.8.15    
http://downloads.asterisk.org/pub/security/AST-2013-003-C.3.diff         Asterisk  
                                                                         BE C.3    

       Links     https://issues.asterisk.org/jira/browse/ASTERISK-21013       

    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-2013-003.pdf and             
    http://downloads.digium.com/pub/security/AST-2013-003.html                

                                Revision History
        Date          Editor                    Revisions Made                
    2013-02-20    Kinsey Moore    Initial revision.                           
    2013-02-27    Kinsey Moore    Added Asterisk BE patch information.        
    2013-02-27    Kinsey Moore    Corrected open source Asterisk versions.    

               Asterisk Project Security Advisory - AST-2013-003
              Copyright (c) 2013 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.

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