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FixerUpper v0.1

A Burp extension to enable modification of FIX messages when relayed from MitM_Relay

Blog post:

https://labs.withsecure.com/publications/a-bit-of-a-fixer-upper-testing-fix-backed-applications

Installation

Can be manually installed by cloning this repository and then from within Burp Suite:

  1. selecting the Extender tab
  2. clicking the Add button
  3. changing the Extension type to Python
  4. selecting fixerupper.py as the extension file.

Note

The extension requires Burp Suite to be configured to use Jython. For installation please see: https://portswigger.net/burp/help/extender.html#options_pythonenv

FixerUpper is designed and intended to help with interception and modification of the TCP-based FIX protocol. As such, it is expected to be used with a TCP relay tool like MitM_Relay.py: https://github.com/jrmdev/mitm_relay

Basic Usage

After adding the extension you can define regular expressions for required HTTP headers, as well as the request body structure:

FixerUpper Config

With this done, you will then get a "Fixer Upper" tab in the request window:

FixerUpper Config