The latest version of CylantSecure adds support for FreeBSD 4.4. CylantSecure is a host-based intrusion detection and prevention system that uses kernel-level behavioral monitoring to detect attacks. The CylantSecure system supports multiple platforms (FreeBSD and Linux at the present).
We have released the kernel level components of CylantSecure into the public domain through the Kernel Instrumentation Project kip.sf.net. The FreeBSD 4.4 patch is at:
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http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/kip/patches/freebsd-4.4-kp.patch
A free evaluation version of CylantSecure can be downloaded at:
http://www.cylant.com/products/cs/eval.html
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