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AST-2012-010: Possible resource leak on uncompleted re-invite transactions

               Asterisk Project Security Advisory - AST-2012-010

         Product        Asterisk                                              
         Summary        Possible resource leak on uncompleted re-invite       
    Nature of Advisory  Denial of Service                                     
      Susceptibility    Remote authenticated sessions                         
         Severity       Minor                                                 
      Exploits Known    No                                                    
       Reported On      June 13, 2012                                         
       Reported By      Steve Davies                                          
        Posted On       July 5, 2012                                          
     Last Updated On    July 5, 2012                                          
     Advisory Contact   Terry Wilson <twilson@xxxxxxxxxx>                     
         CVE Name       TBD                                                   

    Description  If Asterisk sends a re-invite and an endpoint responds to    
                 the re-invite with a provisional response but never sends a  
                 final response, then the SIP dialog structure is never       
                 freed and the RTP ports for the call are never released. If  
                 an attacker has the ability to place a call, they could      
                 create a denial of service by using all available RTP        

    Resolution  A re-invite that receives a provisional response without a    
                final response is detected and properly cleaned up at         

                               Affected Versions
                Product                Release Series     
         Asterisk Open Source               1.8.x         All versions        
         Asterisk Open Source               10.x          All versions        
       Asterisk Business Edition            C.3.x         All versions        
          Certified Asterisk            1.8.11-certx      All versions        
         Asterisk Digiumphones       10.x.x-digiumphones  All versions        

                                  Corrected In
                   Product                              Release               
             Asterisk Open Source         , 10.5.2          
          Asterisk Business Edition                     C.3.7.5               
              Certified Asterisk                      1.8.11-cert4            
            Asterisk Digiumphones                 10.5.2-digiumphones         

                                 URL                                Revision  
   http://downloads.asterisk.org/pub/security/AST-2012-010-1.8.diff Asterisk  
   http://downloads.asterisk.org/pub/security/AST-2012-010-10.diff  Asterisk  

       Links     https://issues.asterisk.org/jira/browse/ASTERISK-19992       

    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-2012-010.pdf and             

                                Revision History
          Date                  Editor                 Revisions Made         
    06/27/2012         Terry Wilson              Initial Release              

               Asterisk Project Security Advisory - AST-2012-010
              Copyright (c) 2012 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.