[asterisk-users] AST-2014-007: Exhaustion of Allowed Concurrent HTTP Connections

[Asterisk Security Team]

               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    
                 blocked.                                                     

    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               1.8.28.1, 11.10.1, 12.3.1        
           Certified Asterisk                1.8.15-cert6, 11.6-cert3         

                                      Patches                          
                                 SVN URL                               Revision  
   http://downloads.asterisk.org/pub/security/AST-2014-007-1.8.diff    Asterisk  
                                                                       1.8       
   http://downloads.asterisk.org/pub/security/AST-2014-007-11.diff     Asterisk  
                                                                       11        
   http://downloads.asterisk.org/pub/security/AST-2014-007-12.diff     Asterisk  
                                                                       12        
   http://downloads.asterisk.org/pub/security/AST-2014-007-1.8.15.diff Certified 
                                                                       Asterisk  
                                                                       1.8.15    
   http://downloads.asterisk.org/pub/security/AST-2014-007-11.6.diff   Certified 
                                                                       Asterisk  
                                                                       11.6      

       Links     https://issues.asterisk.org/jira/browse/ASTERISK-23673       

    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-2014-007.pdf and             
    http://downloads.digium.com/pub/security/AST-2014-007.html                

                                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.