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As some of you may know, I've been working on the portable web application firewall (WAF) rule format for ages. I really believe the concept has potential so I keep coming back to it, making it a little bit better on every visit. At the same time I am closely listening to the WAF market, hoping to jump in with the format just at the right time. Although I can (and will) implement the format in ModSecurity, what I really want is to get as many WAF vendors on board to support the format. That may not be the easiest thing to do so the timing is of real importance.
The idea behind the project is to design a portable WAF rule format capable of "fixing" the known security issues in web applications. While the only proper solution is always to fix the root cause of a security issue, we must acknowledge that the fix can not be implemented straight away (for all sorts of reasons, some legal, some technical, some practical). It is all about minimising the window of opportunity - we want to be able to prevent exploitation of a vulnerability practically as soon as it is discovered.
There are four usage scenarious (I am using the term recipe to refer to a unit of knowledge that contains enough information to prevent vulnerability from being exploited):
Several big improvements were made to the format in the last iteration:
To conclude, the project is now close to its first official release. Allowing some time for feedback from the interested parties, in the next step a "release candidate" specification will be released at the same time as the Java-based reference implementation.
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