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I just dipped into the world of webservers and of course I'm concerned about the vulnerability issue when it comes to them. I know of a program for Windows that is called Retina and it scans for just about every vulnerability known to man on any platform.. but the problem is that it is for windows and I don't like to be in windows too much at all... So, is there a program that is it's equivilent for linux? (I know there are tons, but I need something that is moderately easy to use and maintain). I want to be able to just plug in the IP addy of my webserver and scan it, find out what vulnerabilities it has and then Patch them. The nice thing about Retina is that it tells me how or where I could patch the vulnerability that was on my servers. Thanks for any insight!
If you are talking different functionality than that of nmap (port scanner), then you may want to check out COPS, which you can run nightly with cron to tell you about vulnerabilities and gives you an idea of what to do to correct those issues.
There is another called SAINT, which evolved from SATAN. This is probably closer to what you want, since it knows a lot about Unix servers and can tell you more about what to do to fix any vulnerabilities.
Oops...I noticed SAINT is not freeware/opensource, though I'm pretty sure SATAN was/is. Sorry 'bout that. There's likely something similar in the open source world, but I'm not sure what exactly that might be. COPS should do you pretty good in the meantime though.