CVE-2003-0914: BIND: Negative Cache DOS (negcache)
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CVE-2003-0914: BIND: Negative Cache DOS (negcache)

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Article Summary

A maliciously configured name server can trick a resolver into caching false no-such-name responses for long periods of time.

          CVE: 


                [CVE-2003-0914](http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0914)        


    







        
                  
          CERT: 


                [VU#734644](http://www.kb.cert.org/vuls/id/734644)        


    







        
                  
          Posting date: 


                04 Feb 2004        


    







        
                  
          Program Impacted: 


                [BIND](https://www.isc.org/software/bind)        


    







        
                  
          Versions affected: 


                All versions prior to 8.4.3 and 8.3.7, except some vendor-only releases        


    







        
                  
          Severity: 


                Serious        


    







        
                  
          Exploitable: 


                Remotely        


    






  Description: 



        
                An attacker would configure a name server to 

return authoritative negative responses for a given target domain. Then, the attacker must convince a victim user to query the attacker's maliciously configured name server. When the attacker's name server receives the query, it will reply with an authoritative negative response containing a large TTL (time-to-live) value. If the victim's site runs a vulnerable version of BIND 8, it will cache the negative response and render the target domain unreachable until the TTL expires.

  Workarounds: 



        
                Disable recursion if possible, or limit recursion to specific clients. 


    


    






  Active exploits: 



        
                None known at this time.        


    






  Solution: 



        
                Upgrade to BIND 8.4.3 or later


    


    

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