Audit my Linux server and fix vulnerabilities

I have a Fedora Core 2 server running a Plesk 7.5 Reloaded CP. My server has been blacklisted on SORBS and other sites. I have a very few select clients and am sure that noone is using the server for spam, but I have heard that people can hijack the server via vulnerabilities in the server and/or cgi and php forms. I am not a server admin and know very little about this, so I need someone who can audit the server and forms and figure out what is going on. Maybe there is a way to tell exactly why we were put on the blacklist? There are about 50 domains with less than 10 cgi forms and maybe 30 php forms. You can have whatever level of access you need. Because of the security issues, I will only accept bids from contractors with proven RAC track records. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Fedore COre 2