Security Update 2005-005
Now available via Software Update:
Security Update 2005-005 delivers a number of security enhancements and is recommended for all Macintosh users. This update includes the following components:
For detailed information on this Update, please visit this website: http://www.info.apple.com/kbnum/n61798
This update apparently shows to users of OS X 10.3.x Panther, but not for OS X 10.4 Tiger users. A restart is required after installation.Details on the specific changes can be found here.