Why Web Applications Firewalls don’t block


Jeremiah Grossman describes it much more concisely than I did.

To implement default-deny Web Application Firewalls (WAF) must know everything about a website at all times, even when they change. That’s programmatically documenting every expected request method, URL, parameter name/value pair, cookie, process flow, etc making default-permit deployments the rule rather than the exception.


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