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Category:   Application (VoIP)  >   Asterisk Vendors:   Digium (Linux Support Services)
Asterisk SMS Message Buffer Overflow Lets Remote Users Deny Service
SecurityTracker Alert ID:  1029499
SecurityTracker URL:  http://securitytracker.com/id/1029499
CVE Reference:   CVE-2013-7100   (Links to External Site)
Updated:  Dec 20 2013
Original Entry Date:  Dec 16 2013
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.8.x, 10.x
Description:   A vulnerability was reported in Asterisk. A remote user can cause denial of service conditions.

A remote user can send a 16-bit SMS message with a specially crafted message length value to trigger a buffer overflow and cause the target system to crash.

Jan Juergens reported this vulnerability.

Impact:   A remote user can cause the target service to crash.
Solution:   The vendor has issued a fix (1.8.24.1, 10.12.4, 11.6.1).

The vendor's advisory is available at:

http://downloads.digium.com/pub/security/AST-2013-006.html

Vendor URL:  downloads.digium.com/pub/security/AST-2013-006.html (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Any), UNIX (Any)

Message History:   None.


 Source Message Contents

Date:  Mon, 16 Dec 2013 16:39:37 -0600
Subject:  [Full-disclosure] AST-2013-006: Buffer Overflow when receiving odd length 16 bit SMS message

               Asterisk Project Security Advisory - AST-2013-006

         Product        Asterisk                                              
         Summary        Buffer Overflow when receiving odd length 16 bit SMS  
                        message                                               
    Nature of Advisory  Buffer Overflow and Remote Crash                      
      Susceptibility    Remote SMS Messages                                   
         Severity       Major                                                 
      Exploits Known    None                                                  
       Reported On      September 26, 2013                                    
       Reported By      Jan Juergens                                          
        Posted On       December 16, 2013                                     
     Last Updated On    December 16, 2013                                     
     Advisory Contact   Scott Griepentrog <sgriepentrog AT digium DOT com>    
         CVE Name       Pending                                               

    Description  A 16 bit SMS message that contains an odd message length     
                 value will cause the message decoding loop to run forever.   
                 The message buffer is not on the stack but will be           
                 overflowed resulting in corrupted memory and an immediate    
                 crash.                                                       

    Resolution  This patch corrects the evaluation of the message length      
                indicator, ensuring that the message decoding loop will stop  
                at the end of the received message.                           
                                                                              
                Thanks to Jan Juergens for finding, reporting, testing, and   
                providing a fix for this problem.                             

                               Affected Versions
                Product                 Release Series      
         Asterisk Open Source                1.8.x          All Versions      
         Asterisk Open Source                10.x           All Versions      
      Asterisk with Digiumphones       10.x-digiumphones    All Versions      
         Asterisk Open Source                11.x           All Versions      
          Certified Asterisk                 1.8.x          All Versions      
          Certified Asterisk                 11.x           All Versions      

                                  Corrected In
                  Product                              Release                
            Asterisk Open Source              1.8.24.1, 10.12.4, 11.6.1       
         Asterisk with Digiumphones              10.12.4-digiumphones         
             Certified Asterisk                1.8.15-cert4, 11.2-cert3       

                                          Patches                            
                                  SVN URL                                       Revision     
http://downloads.asterisk.org/pub/security/AST-2013-006-1.8.diff             Asterisk 1.8    
http://downloads.asterisk.org/pub/security/AST-2013-006-10.diff              Asterisk 10     
http://downloads.asterisk.org/pub/security/AST-2013-006-10-digiumphones.diff Asterisk        
                                                                             10-digiumphones 
http://downloads.asterisk.org/pub/security/AST-2013-006-11.diff              Asterisk 11     
http://downloads.asterisk.org/pub/security/AST-2013-006-1.8.15.diff          Certified       
                                                                             Asterisk 1.8.15 
http://downloads.asterisk.org/pub/security/AST-2013-006-11.2.diff            Certified       
                                                                             Asterisk 11.2   

       Links     https://issues.asterisk.org/jira/browse/ASTERISK-22590       

    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-2013-006.pdf and             
    http://downloads.digium.com/pub/security/AST-2013-006.html                

                                Revision History
          Date                  Editor                 Revisions Made         
    12/16/2013         Scott Griepentrog         Initial Revision             

               Asterisk Project Security Advisory - AST-2013-006
              Copyright (c) 2013 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.

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