Security Update 2003-12-19 delivers a number of security enhancements and is recommended for all Macintosh users.
This update includes the following components:
- AFP Server
- ASN.1 Decoding for PKI
- Directory Services
- System Initialization
For more information on this update, please visit this website: http://www.info.apple.com/kbnum/n61798.
As of this writing, the 3.6MB update is available in the Software Update pane for users of OS X 10.3.2 only. Note also that the KBase article linked to in the update notes above doesnit currently have information about this new security update in it.