A.2. Linux Security Checklist
Securing Linux can be more complicated than securing Windows 2000 machines, simply because there are more varieties of Linux distributions. Adding to the difficulty is that the most insecure parts of a system are the additional programs and services offered, not necessarily the code itself. This checklist assumes that you are using the Red Hat Linux distribution.
Upgrade the Kernel
New installations of Linux will most likely use the 2.4.18 kernel or newer. At the time of this writing, it is the most stable. Any kernels earlier than 2.4.13 have a serious vulnerability in how they handle symbolic links and should not be used.
Patch the System
Always download newer versions of software. One of the most valid criticisms ...
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