JSON Web Token (JWT) cracker.
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README.md

JSON Web Token Cracker

jwtcat

Language License

Cracking JSON Web Token.

This script performs offline brute-force attacks against JSON Web Token (JWT) in order to discover the secret key used for the signature.

Note: This script is only configured to work with signatures generated using the 'HS256' hashing algorithm.

More information about JWT vulnerabilities can be found at:

https://auth0.com/blog/critical-vulnerabilities-in-json-web-token-libraries/

example

Installation

$ git clone https://github.com/AresS31/jwtcat
$ cd jwtcat
# pip3 install -r requirements.txt

Usage

$ python3 jwtcat.py [-h] -t TOKEN [-v] -w WORDLIST

[-t, --token]:      JSON Web Token 
[-v, --verbose]:    enable verbose
[-w, --wordlist]:   wordlist containing the passwords
[-h, --help]:       display help

Dependencies

Third-party libraries

PyJWT 1.4.2

The python3-jwt package is required.

https://pypi.python.org/pypi/PyJWT/1.4.2

python-colorlog

The python-colorlog package is required.

https://pypi.python.org/pypi/colorlog

Possible Improvements

  • Increase the script performances.

Licenses

jwtcat

Copyright (C) 2017 Alexandre Teyar

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

PyJWT 1.4.2

Copyright (c) 2015 José Padilla

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

python-colorlog

Copyright (c) 2012 Sam Clements sam@borntyping.co.uk

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.