03-23-2012
pnscan running but not installed
Hello to everyone. I have encountered my first security breach! Quite exciting.
I received a few polite emails from abuse networks indicating my outward-facing web & ftp (no mail) server was sending them unfriendly traffic. A quick htop showed that root had executed "pnscan" but I never recalled installing it. I sent it a kill -9, and sure enough, dpkg -s pnscan tells me it's never been installed.
So it seems pretty clear that someone's gotten access to my system in some fashion. The problem is, I don't know where to begin looking. I've scoured logs - I don't see anything obviously fishy there. I've checked bash history - nothing there (though that's easy to circumvent).
Where else should I be looking, or what has my inexperience caused me to miss in the logs? Is this definitely someone who's rooted my server? Could be an FTP vulnerability?
---------- Post updated at 09:23 AM ---------- Previous update was at 09:14 AM ----------
Oops. This should have been posted in Security. I won't repost, I'll let a moderator move it. Sorry for the inconvenience.
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