Mac OS X 10.1.3 has been released you can update with the built in "Software Update" feature. Networking and Security Improvements include:

Login authentication support for LDAP and Active Directory services
OpenSSH version 3.0.2p1
WebDAV support for Digest authentication
Mail includes support for SSL encryption

old new but hey? some people mightnen know just hard to find security news on macs as the community is rather small thanks