---
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
canonical: "kb.isc.org/aa-00945"
---

> ## 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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