exploits and vulnerabilities?

["Paul Tod Rieger" <prie@abl.com>]

I've minimized the number of services on my firewall as much as my network
requirements allow -- and double-checked the ports with nmap.  All of them
are Debian packages, except for RealServer.

How do I learn more about the exploits/vulnerabilities to which those
services are susceptible?  Do I even need to worry about this -- or is it
enough (reasonably) to keep up with the latest package updates?

Thanks for any "security process" tips!

Tod
always cover your obstacles with fire