Mass-Assigner - Simple Tool Made To Probe For Mass Assignment Vulnerability Through JSON Field Modification In HTTP Requests

Mass Assigner is a powerful tool designed to identify and exploit mass assignment vulnerabilities in web applications. It achieves this by first retrieving data from a specified request, such as fetching user profile data. Then, it systematically attempts to apply each parameter extracted from the response to a second request provided, one parameter at a time. This approach allows for the automated testing and exploitation of potential mass assignment vulnerabilities.

Disclaimer

This tool actively modifies server-side data. Please ensure you have proper authorization before use. Any unauthorized or illegal activity using this tool is entirely at your own risk.

Features

Enables the addition of custom headers within requests
Offers customization of various HTTP methods for both origin and target requests
Supports rate-limiting to manage request thresholds effectively
Provides the option to specify "ignored parameters" which the tool will ignore during execution
Improved the support in nested arrays/objects inside JSON data in responses

What's Next

Support additional content types, such as "application/x-www-form-urlencoded"

Installation & Usage

Install requirements

pip3 install -r requirements.txt

Run the script

python3 mass_assigner.py --fetch-from "http://example.com/path-to-fetch-data" --target-req "http://example.com/path-to-probe-the-data"

Arguments

Forbidden Buster accepts the following arguments:

  -h, --help            show this help message and exit
  --fetch-from FETCH_FROM
                        URL to fetch data from
  --target-req TARGET_REQ
                        URL to send modified data to
  -H HEADER, --header HEADER
                        Add a custom header. Format: 'Key: Value'
  -p PROXY, --proxy PROXY
                        Use Proxy, Usage i.e: http://127.0.0.1:8080.
  -d DATA, --data DATA  Add data to the request body. JSON is supported with escaping.
  --rate-limit RATE_LIMIT
                        Number of requests per second
  --source-method SOURCE_METHOD
                        HTTP method for the initial request. Default is GET.
  --target-method TARGET_METHOD
                        HTTP method for the modified request. Default is PUT.
  --ignore-params IGNORE_PARAMS
                        Parameters to ignore during modification, separated by comma.

Example Usage:

python3 mass_assigner.py --fetch-from "http://example.com/api/v1/me" --target-req "http://example.com/api/v1/me" --header "Authorization: Bearer XXX" --proxy "http://proxy.example.com" --data '{\"param1\": \"test\", \"param2\":true}'