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CVE-2000-0887: zxfr bug
Author: Cathy Almond Reference Number: AA-00945 Views: 3280 Created: 2013-05-29 13:55 Last Updated: 2014-10-28 13:53 100 Rating/ 1 Voters

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
CERT
VU#715973
Posting date: 
10 Nov 2000
Program Impacted: 
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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