My test system: FreeBSD 4.9-stable Pentium III 800
I read an earlier post about using chkrootkit to check for root kits (intrusions). I'm still learning about FreeBSD so I thought I would run this too.
Well... I installed and ran chkrootkit. And the output shows that:
Checking `chfn'... INFECTED Checking `chsh'... INFECTED Checking `date'... INFECTED Checking `ls'... INFECTED Checking `ps'... INFECTED
No rootkits were found.
This FreeBSD system is a test server running Postfix, Samba, Apache, PHP4, MySql, and akpop3. For a firewall I run IPFW.
This computer sits behind a NAT router (linksys BEFSR41). The Linksys router forwards a few ports (25, 110, 80) to a different server (a Redhat-9 system). However, NO PORTS are forwarded to this FreeBSD system.
My Redhat-9 server that runs Apache, Mysql, php4, and postfix.
Question: Does chkrootkit ever generate false positives?
This system has just few test websites on it (test data) and nothing else. But if this system has been compromised, then how? Given that any public services (forwarded from the router) coming across ports 25, 110, 80, 22 are sent to a different server altogether?
I would appreciate any hints or pointers. Thank you.
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