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Category:   Application (VoIP)  >   Asterisk Vendors:   Digium (Linux Support Services)
Asterisk SIP SUBSCRIBE Type Handling Flaw Lets Remote Authenticated Users Deny Service
SecurityTracker Alert ID:  1030875
SecurityTracker URL:  http://securitytracker.com/id/1030875
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Sep 18 2014
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 12.1.0 and later
Description:   A vulnerability was reported in Asterisk. A remote authenticated user can cause denial of service conditions.

A remote authenticated user can send a specially crafted SIP SUBSCRIBE request to cause the target service to crash.

A SIP SUBSCRIBE request with an unexpected mixes of headers for a given event package can trigger this flaw. The crash occurs in the PJSIP-based res_pjsip_pubsub module and not in the old chan_sip module.

The vendor was notified on September 18, 2014.

Mark Michelson reported this vulnerability.

Impact:   A remote authenticated user can cause the target SIP service to crash.
Solution:   The vendor has issued a fix (12.5.1).

The vendor's advisory is available at:

http://downloads.asterisk.org/pub/security/AST-2014-009.html

Vendor URL:  downloads.asterisk.org/pub/security/AST-2014-009.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.


 Source Message Contents

Subject:  [FD] AST-2014-009: Remote crash based on malformed SIP subscription requests

               Asterisk Project Security Advisory - AST-2014-009

         Product        Asterisk                                              
         Summary        Remote crash based on malformed SIP subscription      
                        requests                                              
    Nature of Advisory  Remotely triggered crash of Asterisk                  
      Susceptibility    Remote authenticated sessions                         
         Severity       Major                                                 
      Exploits Known    No                                                    
       Reported On      30 July, 2014                                         
       Reported By      Mark Michelson                                        
        Posted On       18 September, 2014                                    
     Last Updated On    September 18, 2014                                    
     Advisory Contact   Mark Michelson <mmichelson AT digium DOT com>         
         CVE Name       Pending                                               

    Description  It is possible to trigger a crash in Asterisk by sending a   
                 SIP SUBSCRIBE request with unexpected mixes of headers for   
                 a given event package. The crash occurs because Asterisk     
                 allocates data of one type at one layer and then interprets  
                 the data as a separate type at a different layer. The crash  
                 requires that the SUBSCRIBE be sent from a configured        
                 endpoint, and the SUBSCRIBE must pass any authentication     
                 that has been configured.                                    
                                                                              
                 Note that this crash is Asterisk's PJSIP-based               
                 res_pjsip_pubsub module and not in the old chan_sip module.  

    Resolution  Type-safety has been built into the pubsub API where it       
                previously was absent. A test has been added to the           
                testsuite that previously would have triggered the crash.     

                               Affected Versions      
                        Product                       Release  
                                                      Series   
                  Asterisk Open Source                 1.8.x   Unaffected     
                  Asterisk Open Source                 11.x    Unaffected     
                  Asterisk Open Source                 12.x    12.1.0 and up  
                   Certified Asterisk                 1.8.15   Unaffected     
                   Certified Asterisk                  11.6    Unaffected     

                                  Corrected In         
                         Product                              Release         
                  Asterisk Open Source                        12.5.1          

                                    Patches                          
                                SVN URL                              Revision 
   http://downloads.asterisk.org/pub/security/AST-2014-009-12.diff   Asterisk 
                                                                     12       

    Links  https://issues.asterisk.org/jira/browse/ASTERISK-24136             

    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-2014-009.pdf and             
    http://downloads.digium.com/pub/security/AST-2014-009.html                

                                Revision History
         Date            Editor                  Revisions Made               
    19 August, 2014  Mark Michelson  Initial version of document              

               Asterisk Project Security Advisory - AST-2014-009
              Copyright (c) 2014 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.


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