[asterisk-security] AST-2022-001: res_stir_shaken: resource exhaustion with large files

[Asterisk Security Team]

               Asterisk Project Security Advisory - AST-2022-001

         Product        Asterisk                                              
         Summary        res_stir_shaken: resource exhaustion with large       
                        files                                                 
    Nature of Advisory  Resource exhaustion                                   
      Susceptibility    Remote unauthenticated access                         
         Severity       Major                                                 
      Exploits Known    No                                                    
       Reported On      Jan 21, 2022                                          
       Reported By      Ben Ford                                              
        Posted On       Apr 14, 2022                                          
     Last Updated On    April 13, 2022                                        
     Advisory Contact   bford AT sangoma DOT com                              
         CVE Name       CVE-2022-26498                                        

      Description     When using STIR/SHAKEN, it’s possible to download       
                      files that are not certificates. These files could be   
                      much larger than what you would expect to download.     
    Modules Affected  res_stir_shaken                                         

    Resolution  If you are using STIR/SHAKEN in Asterisk, upgrade to one of   
                the versions listed below. Asterisk now checks the            
                downloaded file to see if it’s actually a certificate or if   
                it is larger than what is expected.                           
                                                                              
                If not upgrading, the curl_timeout option in                  
                stir_shaken.conf should be utilized so that downloads do not  
                last an extended period of time.                              

                               Affected Versions
               Product             Release Series  
        Asterisk Open Source            16.x       16.15.0 and after          
        Asterisk Open Source            18.x       All versions               
        Asterisk Open Source            19.x       All versions               

                                  Corrected In
                 Product                              Release                 
          Asterisk Open Source               16.25.2, 18.11.2, 19.3.2         

                                    Patches                         
                              Patch URL                             Revision  
    https://downloads.digium.com/pub/security/AST-2022-001-16.diff  Asterisk  
                                                                    16        
    https://downloads.digium.com/pub/security/AST-2022-001-18.diff  Asterisk  
                                                                    18        
    https://downloads.digium.com/pub/security/AST-2022-001-19.diff  Asterisk  
                                                                    19        

     Links   https://issues.asterisk.org/jira/browse/ASTERISK-29872           
                                                                              
             https://downloads.asterisk.org/pub/security/AST-2022-001.html    

    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                                                 
    https://downloads.digium.com/pub/security/AST-2022-001.pdf and            
    https://downloads.digium.com/pub/security/AST-2022-001.html               

                                Revision History
          Date                 Editor                 Revisions Made          
    Apr 13, 2022       Ben Ford                Initial revision               

               Asterisk Project Security Advisory - AST-2022-001
            Copyright © 01/19/2022 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.