How to secure a VPS
SECURING CPANEL – WHM – AND ROOT on a VPS
This will help but as mentioned in previous posts, with a VPS you do not have access to your kernal. That is good in some ways, because if you don’t have access to it, neither to hackers or spammers (which limits what they can do). Its bad in ways, because you lose control and if you secure your box as much as possible, you are still at risk because you cannot control your kernal.
At any rate, here are some helpful hints
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Checking for formmail
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Form mail is used by hackers to send out spam email, by relay and injection methods. If you are using matts script or a version of it, you may be in jeopardy. (More …)