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Burp Custom Tab Extender

Jasveer | Last updated: Mar 18, 2020 03:57PM UTC

Hi, I am trying to learn how to write Burp Extender and I used one of the example from the following: https://github.com/PortSwigger/example-custom-editor-tab Since the above example, was using base64 encode and decode, I have decided change the extender from encoding/decoding Base64 to automatically URL encode and decode everything which was sent to the server. In my custom tab, I was able to view URL decoded value but upon trying to modify the value in custom tab, the custom tab automatically closes when I click on "Raw" tab and Raw and Hex are empty with no HTTP header, body and etc Below is my code. It would be grateful, if could tell me where I went wrong as I am still trying to learn programming. Thanks in advance. def getMessage(self): if self._txtInput.isTextModified(): # reserialize the data text = self._txtInput.getText() #base64 works but not urlEncode #input = self._extender._helpers.urlEncode(self._extender._helpers.base64Encode(text)) input = self._extender._helpers.urlEncode(text) print (input) # update the request with the new parameter value return self._extender._helpers.updateParameter(self._currentMessage, self._extender._helpers.buildParameter("data", input, IParameter.PARAM_BODY)) else: return self._currentMessage

Hannah, PortSwigger Agent | Last updated: Mar 19, 2020 10:30AM UTC