[Full-disclosure] How to Determine My System Vulnerabilities

I have three servers running Linux Red Hat OS.  I would lke to find a source for information regarding "How Too" when it comes to determining what level of kernel, SSH, PHP, ect my servers are running.  I do know how to check some of these things but am looking for someone who is very knowledgeble and is willing to answer questions about this OS.

Gene Smith
Federal Reserve Bank of Minneapolis
IT/ Telecom  612 204 6355
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