Check all your log files, and make a visit to your security lists and pages and see if there are any new common exploits you can fix. You can find Caldera security fixes at http://www.caldera.com/tech-ref/security/. Red Hat has not yet separated their security fixes from bug fixes, but their distribution errata is available at http://www.redhat.com/errata
Debian now has a security mailing list and web page. See: http://www.debian.org/security/ for more information.
It is very likely that if one vendor has released a security update, that most other Linux vendors will as well.
There is now a Linux security auditing project. They are methodically going through all the user-space utilities and looking for possible security exploits and overflows. From their announcement:
""We are attempting a systematic audit of Linux sources with a view to being as secure as OpenBSD. We have already uncovered (and fixed) some problems, but more help is welcome. The list is unmoderated and also a useful resource for general security discussions. The list address is: security-audit@ferret.lmh.ox.ac.uk To subscribe, send a mail to: security-audit-subscribe@ferret.lmh.ox.ac.uk""
If you don't lock the attacker out, they will likely be back. Not just back on your machine, but back somewhere on your network. If they were running a packet sniffer, odds are good they have access to other local machines.
You should also notify any security organizations you are a part of (CERT or similar), as well as your Linux system vendor.
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