I know this is rather rude to those who're aware of the threat for some time now but ... there is a Linux BIND (DNS) worm spreading and it's NASTY. Since some major sites don't post on this i'd thought it would be worth mentioning. Basically the safest thing to do is update the version of BIND you are using.
Have a read at http://www.theregister.co.uk/content/8/17929.html link of interest in this article points to an adivsory at : http://www.sans.org/y2k/lion.htm Other site of interest should be : http://www.securityfocus.com/linux Wich also publishes some usable info on securing your system and using stuff like tripwire Greetings, Joris