Apple has made Security Update 2007-005 available via Software Update or from Apple's website.
The update which is available for 10.4 users on both PPC and Intel platforms, the update also applies to users of 10.3.9 and 10.3.9 Server.
Security Update 2007-005 is recommended for all users and improves the security of the following components:
- bind
- CarbonCore
- CoreGraphics
- crontabs
- fetchmail
- file
- iChat
- mDNSResponder
- PPP
- ruby
- screen
- texinfo
- VPN
More details on each individual component available here.