Apple has posted Security Update 2002-11-21. The security patch fixes some potential problems with BIND, and can be found in the Software Update Control Panel, or directly from Appleis Knowledge Base Web site. This from Apple:
This Security Update fixes potential vulnerabilities introduced in BIND, the domain server and client library software package from Internet Software Consortium (ISC), that is shipped with Mac OS X and Mac OS X Server. BIND version 8.3.4 addresses the recently-discovered potential vulnerabilities where an unauthorized person may disrupt the normal operation of the DNS name service. BIND is not activated by default on Mac OS X or Mac OS X Server.
You can get the latest update via Software Update or from Appleis Knowledge Base website.