System OS X Security Update 2005-001 is now available:

http://docs.info.apple.com/article.html?artnum=300770
http://docs.info.apple.com/article.html?artnum=106704

Security Update 2005-001
* at commands - local privilege escalation
* ColorSync - heap overflow fixed though malformed input files
* libxml2 - potentially exploitable buffer overflows
* Mail - strange one: CAN-2005-0127: Message-ID info leak
* PHP – multiple known vulnerabilities
* Safari - pop-ups (when not blocked) can mislead users
* SquirrelMail - CSS vulnerability fixed