JWTweak

Introduction

With the global increase in JSON Web Token (JWT) usage, the attack surface has also increased significantly. Having said that, this utility is designed with the aim to generate the new JWT token with little or no time which would help security enthusiasts to find security flaws in JWT implementation. This tool is designed to automate the process of modifying the JWT algorithm of input JWT Token and then generate the new JWT based on the new algorithm.

Requirements

• Python 3
• Valid JWT Token

Features

• Detects the algorithm of the input JWT Token
• Base64 decode the input JWT Token
• Generate new JWT Token by changing the algorithm of the input JWT to 'None'
• Generate new JWT Token by changing the algorithm of the input JWT to 'HS256'
• Generate new JWT Token by changing the algorithm of the input JWT to 'HS384'
• Generate new JWT Token by changing the algorithm of the input JWT to 'HS512'

Download Link

JWTweak.py

POC

Read where it can help

• JWT Attack Walk-Through-NCC Group
• Hack the JWT Token-Habr

Please connect, if you have any query, suggestion or feedback.

Rishu Ranjan