I'm looking for tools that will audit a very simple Unix (Linux or BSD) installation, identify vulnerabilities, and perhaps give suggestions for fixing them.
I realize that "penetration testing" can get pretty involved, and that there are many specialized tools for it, but I just want to test a minimal, dedicated home system (like the one I described in this earlier post), so I'm hoping to find tools that can do a reliable all-around security audit on such a simple system, perhaps after automatically running a collection (the larger the better) of standard tests.