Web Application Firewall (WAF)

What is a waf?

A web application firewall (WAF) is an appliance, server plugin, or filter that applies a set of rules to an HTTP conversation. Generally, these rules cover common attacks such as cross-site scripting (XSS) and SQL injection. By customizing the rules to your application, many attacks can be identified and blocked.

Any example?

ModSecurity is an open source web application firewall (WAF) module that is cross platform capable. Known as the “Swiss Army Knife” of WAFs, it enables web application defenders to gain visibility into HTTP(S) traffic and provides a power rules language and API to implement advanced protections.

More on this here: http://www.darknet.org.uk/2015/11/modsecurity-open-source-web-application-firewall/

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