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Date: Thu, 12 Jun 2014 15:45:54 -0500
From: "Asterisk Security Team" <>
Subject: [FD] AST-2014-007: Exhaustion of Allowed Concurrent HTTP Connections

               Asterisk Project Security Advisory - AST-2014-007

          Product         Asterisk                                            
          Summary         Exhaustion of Allowed Concurrent HTTP Connections   
     Nature of Advisory   Denial Of Service                                   
       Susceptibility     Remote Unauthenticated Sessions                     
          Severity        Moderate                                            
       Exploits Known     No                                                  
        Reported On       May 25, 2014                                        
        Reported By       Richard Mudgett                                     
         Posted On        May 9, 2014                                         
      Last Updated On     June 12, 2014                                       
      Advisory Contact    Richard Mudgett <rmudgett AT digium DOT com>        
          CVE Name        CVE-2014-4047                                       

    Description  Establishing a TCP or TLS connection to the configured HTTP  
                 or HTTPS port respectively in http.conf and then not         
                 sending or completing a HTTP request will tie up a HTTP      
                 session. By doing this repeatedly until the maximum number   
                 of open HTTP sessions is reached, legitimate requests are    

    Resolution  The patched versions now have a session_inactivity timeout    
                option in http.conf that defaults to 30000 ms. Users should   
                upgrade to a corrected version, apply the released patches,   
                or disable HTTP support.                                      

                               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             
          Certified Asterisk             1.8.15      All versions             
          Certified Asterisk              11.6       All versions             

                                  Corrected In
                 Product                              Release                 
          Asterisk Open Source     , 11.10.1, 12.3.1        
           Certified Asterisk                1.8.15-cert6, 11.6-cert3         

                                 SVN URL                               Revision    Asterisk  
                                                                       1.8      Asterisk  
                                                                       11       Asterisk  
                                                                       12   Certified 
                                                                       1.8.15   Certified 


    Asterisk Project Security Advisories are posted at                                                             
    This document may be superseded by later versions; if so, the latest      
    version will be posted at                                             and                        

                                Revision History
          Date                  Editor                 Revisions Made         
    May 9, 2014        Richard Mudgett           Document Creation            
    June 12, 2014      Matt Jordan               Added CVE                    

               Asterisk Project Security Advisory - AST-2014-007
              Copyright (c) 2014 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.

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