[asterisk-security] AST-2017-009: Buffer overflow in pjproject header parsing can cause crash in Asterisk

[Asterisk Security Team]

               Asterisk Project Security Advisory - AST-2017-009

         Product        Asterisk                                              
         Summary        Buffer overflow in pjproject header parsing can       
                        cause crash in Asterisk                               
    Nature of Advisory  Denial of Service                                     
      Susceptibility    Remote Unauthenticated Sessions                       
         Severity       Critical                                              
      Exploits Known    No                                                    
       Reported On      October 5, 2017                                       
       Reported By      Youngsung Kim at LINE Corporation                     
        Posted On       
     Last Updated On    October 25, 2017                                      
     Advisory Contact   gjoseph AT digium DOT com                             
         CVE Name       

    Description  By carefully crafting invalid values in the Cseq and the     
                 Via header port, pjproject’s packet parsing code can create  
                 strings larger than the buffer allocated to hold them. This  
                 will usually cause Asterisk to crash immediately. The        
                 packets do not have to be authenticated.                     

    Resolution  Stricter validation is now done on strings that represent     
                numeric values before they are converted to intrinsic types.  
                Invalid values now cause packet processing to stop and error  
                messages to be emitted.                                       

                               Affected Versions
                Product              Release Series  
         Asterisk Open Source             13.x       All Releases             
         Asterisk Open Source             14.x       All Releases             
         Asterisk Open Source             15.x       All Releases             
          Certified Asterisk             13.13       All Releases             

                                  Corrected In
                 Product                              Release                 
           Asterisk Open Source               13.18.1, 14.7.1, 15.1.1         
            Certified Asterisk                      13.13-cert7               

                                     Patches                          
                                SVN URL                               Revision  
   http://downloads.asterisk.org/pub/security/AST-2017-009-13.diff    Asterisk  
                                                                      13        
   http://downloads.asterisk.org/pub/security/AST-2017-009-14.diff    Asterisk  
                                                                      14        
   http://downloads.asterisk.org/pub/security/AST-2017-009-15.diff    Asterisk  
                                                                      15        
   http://downloads.asterisk.org/pub/security/AST-2017-009-13.13.diff Certified 
                                                                      Asterisk  
                                                                      13.13     

       Links     https://issues.asterisk.org/jira/browse/ASTERISK-27319       

    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-2017-009.pdf and             
    http://downloads.digium.com/pub/security/AST-2017-009.html                

                                Revision History
          Date                  Editor                 Revisions Made         
    October 25, 2017   George Joseph             Initial Revision             

               Asterisk Project Security Advisory - AST-2017-009
               Copyright © 2017 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.