bind security update

Version 9 of ISC BIND, prior to version 9.2.1, contained a denial of
service (DoS) attack vulnerability. Various versions of the ISC BIND
resolver libraries are vulnerable to a buffer overflow attack.

ISC BIND (Berkeley Internet Name Domain) is an implementation of the DNS
(Domain Name System) protocols. BIND includes a DNS server (named) --
which resolves hostnames to IP addresses, a resolver library
(routines for applications to use when interfacing with DNS), and
various tools.

Versions of BIND 9 prior to 9.2.1 have a bug that causes certain requests
to the BIND name server to fail an internal consistency check, causing the
name server to stop responding to requests. This can be used by a remote
attacker to cause a denial of service (DoS) attack against name servers.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2002-0400 to this issue.

A buffer overflow vulnerability exists in multiple implementations of DNS
resolver libraries. Applications that utilize vulnerable DNS resolver
libraries may be affected. A remote attacker who is able to send malicious
DNS responses could potentially exploit this vulnerability to execute
arbitrary code or cause a denial of service (DoS) attack on a vulnerable
system. Red Hat Linux does not ship with any applications or libraries that
link against the BIND resolver libraries; however, third party code may be
affected. (CAN-2002-0651)

Red Hat Linux Advanced Server shipped with a version of ISC BIND vulnerable
to both of these issues. All users of BIND are advised to upgrade to the
errata packages containing BIND 9.2.1 which contains backported patches
that correct these issues.

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

Please note that this update is available via Red Hat Network. To use Red
Hat Network, launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-0400
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-0651
http://www.kb.cert.org/vuls/id/803539
http://online.securityfocus.com/bid/5100
http://www.cert.org/advisories/CA-2002-19.html
http://www.cert.org/advisories/CA-2002-15.html

bind, buffer, consistency, DoS, libbind, overflow, srv