The issue is far bigger than just doing a few things to close your system up. How valuable is your system for the 'mission' it provides? What about your data? What backup and/or disaster recovery processes have you prepared?

I'd actively migrate to a more recent edition of the OS, and put processes in place to keep patches updated.

There are a number of places to get hardening guidance... YMMV. There is the Center for Internet Security, DISA and NIST. Those are pretty good starting point.

From: Dov-el <dov_el@qx.net>
To: security@lists.fedoraproject.org
Sent: Wednesday, June 27, 2012 1:36 PM
Subject: my fedora 13 machine has been cracked

Someone has broken into my fedora 13 machine. Aside from closing unused ports on the firewall and router and disabling unused services, what should I be doing to harden my set up? Tripwire? AIDE? What else? Thanks in advance!

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