[asterisk-dev] AST-2015-002: Mitigation for libcURL HTTP request injection vulnerability

[Asterisk Security Team]

               Asterisk Project Security Advisory - AST-2015-002

         Product        Asterisk                                              
         Summary        Mitigation for libcURL HTTP request injection         
                        vulnerability                                         
    Nature of Advisory  HTTP request injection                                
      Susceptibility    Remote Authenticated Sessions                         
         Severity       Major                                                 
      Exploits Known    No                                                    
       Reported On      12 January, 2015                                      
       Reported By      Olle Johansson                                        
        Posted On       January 12, 2015                                      
     Last Updated On    January 28, 2015                                      
     Advisory Contact   Mark Michelson <mmichelson AT digium DOT com>         
         CVE Name       N/A.                                                  

    Description  CVE-2014-8150 reported an HTTP request injection             
                 vulnerability in libcURL. Asterisk uses libcURL in its       
                 func_curl.so module (the CURL() dialplan function), as well  
                 as its res_config_curl.so (cURL realtime backend) modules.   
                                                                              
                 Since Asterisk may be configured to allow for user-supplied  
                 URLs to be passed to libcURL, it is possible that an         
                 attacker could use Asterisk as an attack vector to inject    
                 unauthorized HTTP requests if the version of libcURL         
                 installed on the Asterisk server is affected by              
                 CVE-2014-8150.                                               

    Resolution  Asterisk has been patched with a similar patch as libcURL     
                was for CVE-2014-8150. This means that carriage return and    
                linefeed characters are forbidden from being in HTTP URLs     
                that will be passed to libcURL.                               

                               Affected Versions       
                         Product                       Release  
                                                       Series   
                   Asteris Open Source                  1.8.x   All versions  
                  Asterisk Open Source                  11.x    All versions  
                  Asterisk Open Source                  12.x    All versions  
                  Asterisk Open Source                  13.x    All versions  
                   Certified Asterisk                  1.8.28   All versions  
                   Certified Asterisk                   11.6    All versions  

                                  Corrected In
          Product                              Release                        
    Asterisk Open Source          1.8.32.2, 11.15.1, 12.8.1, 13.1.1           
     Certified Asterisk               1.8.28-cert4, 11.6-cert10               

                                      Patches                          
                                 SVN URL                               Revision  
   http://downloads.asterisk.org/pub/security/AST-2015-002-1.8.28.diff Certified 
                                                                       Asterisk  
                                                                       1.8.28    
   http://downloads.asterisk.org/pub/security/AST-2015-002-11.6.diff   Certified 
                                                                       Asterisk  
                                                                       11.6      
   http://downloads.asterisk.org/pub/security/AST-2015-002-1.8.diff    Asterisk  
                                                                       1.8       
   http://downloads.asterisk.org/pub/security/AST-2015-002-11.diff     Asterisk  
                                                                       11        
   http://downloads.asterisk.org/pub/security/AST-2015-002-12.diff     Asterisk  
                                                                       12        
   http://downloads.asterisk.org/pub/security/AST-2015-002-13.diff     Asterisk  
                                                                       13        

    Links  https://issues.asterisk.org/jira/browse/ASTERISK-24676             

    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-2015-002.pdf and             
    http://downloads.digium.com/pub/security/AST-2015-002.html                

                                Revision History
          Date            Editor                  Revisions Made              
    21 January, 2015  Mark Michelson  Initial creation of document            

               Asterisk Project Security Advisory - AST-2015-002
              Copyright (c) 2015 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.