jwtcat is a
Python script designed to detect and exploit well-known cryptographic flaws present in JSON Web Token (JWT). These vulnerabilities, if successfully exploited by an adversary could allow authentication bypass, information disclosure and could ultimately lead to the compromise of an entire information system.
More information about JWT vulnerabilities can be found at: https://auth0.com/blog/critical-vulnerabilities-in-json-web-token-libraries/
Nonehashing algorithm (
jwtcat is written in Python 3 (and therefore requires a minimum of
Python 3.6) in addition to the following libraries:
git clone https://github.com/AresS31/jwtcat cd jwtcat
(Optional but recommended) Create and activate a new
Python virtual environment:
python -m venv env
python -m pip install -r requirements.txt
To get a list of options and switches use:
python jwtcat.py -h
To get a list of options and switches for brute force attacks:
python jwtcat.py brute-force -h
To get a list of options and switches for wordlist attacks:
python jwtcat.py wordlist -h
To test a JWT against CVE-2018-1000531 and HS256 brute-force attacks:
python jwtcat.py vulnerable -h
If you use
jwtcat a lot (especially if it's used commercially), please consider donating as a lot of time and effort went into building and maintaining this project.
Press the "Sponsor" button on the top of this page to see ways of donating/sponsoring to this project.
Your feedback and contributions will be much appreciated.
TQDMintegration with the
Copyright (C) 2017 - 2020 Alexandre Teyar
See LICENSE file for details.