![]() PHP will discard a + at the beginning of each parameter, but a poorly written WAF rule might be written for specific parameter names, thus ignoring parameters with a + at the beginning. The parameter obfuscation feature is language specific. ![]() The last slash can be modified to one of many values that in many cases results in a still valid request but can bypass poorly written WAF rules that rely on path information. The path obfuscation feature modifies the last forward slash in the path to a random value, or by default does nothing.This can be used to bypass poorly written rules that rely on path information. The path injection feature can leave a request unmodified, inject random path info information (/path/to/example.php/randomvalue?restofquery), or inject a random path parameter (/path/to/example.php randomparam=randomvalue?resetofquery).The request type option allows the Burp user to only use the remaining bypass techniques on the given request method of "GET" or "POST", or to apply them on all requests.Poorly configured WAFs might be configured to only evaluate requests based on the correct FQDN of the host found in this header, which is what this bypass targets. The "Host" header can also be modified.Some WAFs will only decode/evaluate requests based on known content types, this feature targets that weakness. The "Content-Type" header can remain unchanged in each request, removed from all requests, or by modified to one of the many other options for each request.It isn't unusual for a WAF to be configured to trust itself (127.0.0.1) or an upstream proxy device, which is what this bypass targets. This is probably the top bypass technique i the tool. Users can modify the X-Originating-IP, X-Forwarded-For, X-Remote-IP, X-Remote-Addr headers sent in each request.Configure the bypass options on the "Bypass WAF" tabīypass WAF contains the following features:.Modify the scope to include applicable tools and URLs.Create a session handling rule in Burp that invokes this extension.The following headers are automatically added to all requests: This extension add headers to all Burp requests to bypass some WAF products.
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