Snort is a lightweight network intrusion detection system, capable of performing real-time traffic analysis and packet logging on IP networks. It can perform protocol analysis, content searching/matching and can be used to detect a variety of attacks and probes, such as buffer overflows, stealth port scans, CGI attacks, SMB probes, OS fingerprinting attempts, and much more. Snort uses a flexible rules language to describe traffic that it should collect or pass, as well as a detection engine that utilizes a modular plugin architecture.
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Saint Jude LKM is a Linux Kernel Module for the 2.2.0 series of kernels. This module implements the Saint Jude model for improper privilege transitions. This will permit the discovery of local, and ultimately, remote root exploits during the exploit itself. Once discovered, Saint Jude will terminate the execution, preventing the root exploit from occuring. This is done without checking for attack signatures of known exploits, and thus should work for both known and unknown exploits.
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Nessus is a free, up-to-date, and full featured remote security scanner for Linux, BSD, Solaris and some other systems. It is multithreaded, plugin-based, has a nice GTK interface, and currently performs over 330 remote security checks. It has powerful reporting capabilities (HTML, LaTeX, ASCII text) and not only points out problems, but suggests a solution for each of them.
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