January 29, 2001
BIND is a server program that implements the domain name service protocol. It is in extremely wide use on the Internet, in use by most of the DNS servers. Version 4 of BIND contains a stack overflow that may be exploitable to remote attackers. The vulnerability is due to unsafe use of the sprintf() function to construct an error message.
If an attacker controls a DNS server, this vulnerability can be exploited. An attacker may be able to execute shellcode with the privileges of named (typically root).
- ISC BIND 4.9.0
- ISC BIND 4.9.3
- ISC BIND 4.9.4
- ISC BIND 4.9.5
- ISC BIND 4.9.5 P1
- ISC BIND 4.9.6
- ISC BIND 4.9.7
- ISC BIND 4.9.7 -T1B
- ISC BIND 8.2.0
Block external access at the network boundary, unless external parties require service.
If the service is not required to be globally accessible it is recommended that access be restricted to trusted hosts and networks.
The ISC strongly recommends upgrading to BIND version 9.1.0. Links to download are available below.
Sun has released Sun Alert (ID 26965) dealing with this and other issues. Please see the referenced advisory for more information.
Additional fixes are also available.
Discovered and documented by Anthony Osborne and John McDonald of the COVERT Labs at PGP Security.
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