Asterisk Project Security Advisory - AST-2017-001

         Product        Asterisk                                              
         Summary        Buffer overflow in CDR's set user                     
    Nature of Advisory  Buffer Overflow                                       
      Susceptibility    Remote Authenticated Sessions                         
         Severity       Moderate                                              
      Exploits Known    No                                                    
       Reported On      March 27, 2017                                        
       Reported By      Alex Villacis Lasso                                   
        Posted On       
     Last Updated On    April 4, 2017                                         
     Advisory Contact   kharwell AT digium DOT com                            
         CVE Name       

    Description  No size checking is done when setting the user field on a    
                 CDR. Thus, it is possible for someone to use an arbitrarily  
                 large string and write past the end of the user field        
                 storage buffer. This allows the possibility of remote code   
                 injection.                                                   
                                                                              
                 This currently affects any system using CDR's that also      
                 make use of the following:                                   
                                                                              
                 * The 'X-ClientCode' header within a SIP INFO message when   
                 using chan_sip and                                           
                                                                              
                 the 'useclientcode' option is enabled (note, it's disabled   
                 by default).                                                 
                                                                              
                 * The CDR dialplan function executed from AMI when setting   
                 the user field.                                              
                                                                              
                 * The AMI Monitor action when using a long file name/path.   

    Resolution  The CDR engine now only copies up to the maximum allowed      
                characters into the user field. Any characters outside the    
                maximum are truncated.                                        

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

                                  Corrected In                
                            Product                              Release      
                      Asterisk Open Source                    13.14.1,14.3.1  
                       Certified Asterisk                      13.13-cert3    

                                     Patches                          
                                SVN URL                               Revision  
   http://downloads.asterisk.org/pub/security/AST-2017-001-13.diff    Asterisk  
                                                                      13        
   http://downloads.asterisk.org/pub/security/AST-2017-001-14.diff    Asterisk  
                                                                      14        
   http://downloads.asterisk.org/pub/security/AST-2017-001-13.13.diff Certified 
                                                                      Asterisk  
                                                                      13.13     

    Links  https://issues.asterisk.org/jira/browse/ASTERISK-26897             

    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-2017-001.pdf and             
    http://downloads.digium.com/pub/security/AST-2017-001.html                

                                Revision History
         Date           Editor                   Revisions Made               
    March, 27, 2017  Kevin Harwell  Initial Revision                          

               Asterisk Project Security Advisory - AST-2017-001
               Copyright A(c) 2017 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.