ModSecurity supplies an array of request filtering and other security features to the Apache HTTP Server, IIS and NGINX.
ModSecurity is a web application layer firewall.
ModSecurity is free software released under the Apache license 2.0.
On February 13, 2013, a comparative penetration testing analysis report was published by Zero Science Lab, showing that ModSecurity is more effective than CloudFlare and Incapsula, but it has more false positives than Incapsula.
External links
mod_security project home page
Linux Mod Security Introduction and Install guide
Fonte: http://en.wikipedia.org/wiki/ModSecurity
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