---
title: "CVE-2000-0887: zxfr bug"
slug: "aa-00945"
description: "A bug in code intended to provide support for the transfer of compressed zone files can result in the name server crashing."
updated: 2014-10-28T08:53:00Z
published: 2014-10-28T08:53:00Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.isc.org/llms.txt
> Use this file to discover all available pages before exploring further.

# CVE-2000-0887: zxfr bug

A
 bug in code intended to provide support for the transfer of compressed 
zone files can result in the name server crashing.         
        




    
            
                      
              CVE: 


                    [CVE-2000-0887](http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-0887)        


        






    
            
                      
              CERT: 


                    [VU#715973](http://www.kb.cert.org/vuls/id/715973)        


        






    
            
                      
              Posting date: 


                    10 Nov 2000        


        






    
            
                      
              Program Impacted: 


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


        






    
            
                      
              Versions affected: 


                     8.2.2 - 8.2.2-p6        


        






    
            
                      
              Severity: 


                    Serious        


        






    
            
                      
              Exploitable: 


                    Remotely        


        






      Description: 


    
            
                    named in BIND 8.2 through 8.2.2-P6 allows remote 
attackers to cause a denial of service by making a compressed zone 
transfer (ZXFR) request and performing a name service query on an 
authoritative record that is not cached, aka the "zxfr bug." This will 
disrupt name resolution service until the named daemon is restarted. 


        


        






      Workarounds: 


    
            
                    A partial workaround can be implemented by 
disallowing zone transfers except from trusted hosts. Note that if the 
trusted hosts are compromised, name servers with this bug will be 
vulnerable to denial of service attacks. 


        


        






      Active exploits: 


    
            
                    This attack can be implemented using utilities provided with the BIND package (named-xfer and dig).        


        






      Solution: 


    
            
                    Upgrade to 8.2.2-p7 or later. 


        


        












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