AST-2013-003: Username disclosure in SIP channel driver

           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 <[email protected]>                    
      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.