"Hacking Linux Exposed is a very good read. It does a
great job of staying focused and interesting, without skimping on
the actual details you need to secure your systems and understand
the threats. The countermeasures are real and specific, allowing
administrators to use this book as a tool to secure their own
At many times I wished that the book were more Unix-centric than
simply Linux centric. Many of the issues are similar, and the
countermeasures would simply be broken down into *BSD vs Linux vs
Solaris, etc. However that would have made reading the
countermeasures a bit more difficult. As it is, many of the issues
have similar or identical countermeasures, regardless of OS, so
administrators should be able to extend what is said to their Unix
OS of choice without too much trouble.
The Linux focus allows the authors to get much more in depth
than they were able to in Hacking Exposed , which was disjointed at
times, unable to really probe each issue. However the opposite is
also true --- since they wanted to focus on Linux-specific attacks,
scripting, and other browser-related problems, for example. For
these types of attacks you should look elsewhere. I think keeping
the focus clean is very much worth it."
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