https://github.com/aress31/jwtcat

A CPU-based JSON Web Token (JWT) cracker and - to some extent - scanner.
https://github.com/aress31/jwtcat

authentication authorization bearer-tokens bruteforce cracker cracking cracking-hashes cve-2018-1000531 cybersecurity hs256 jwt pentest-tool pentesting pyjwt python signature token

Last synced: 19 days ago
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A CPU-based JSON Web Token (JWT) cracker and - to some extent - scanner.

• Host: GitHub
• URL: https://github.com/aress31/jwtcat
• Owner: aress31
• License: apache-2.0
• Created: 2017-01-13T17:01:43.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2024-05-03T19:57:26.000Z (7 months ago)
• Last Synced: 2024-10-21T05:50:15.010Z (about 2 months ago)
• Topics: authentication, authorization, bearer-tokens, bruteforce, cracker, cracking, cracking-hashes, cve-2018-1000531, cybersecurity, hs256, jwt, pentest-tool, pentesting, pyjwt, python, signature, token
• Language: Python
• Homepage:
• Size: 513 KB
• Stars: 291
• Watchers: 9
• Forks: 48
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

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• awesome-hacking-lists - aress31/jwtcat - A CPU-based JSON Web Token (JWT) cracker and - to some extent - scanner. (Python)

README

        
# jwtcat

[![Language](https://img.shields.io/badge/Lang-Python-blue.svg)](https://www.python.org)

[![License](https://img.shields.io/badge/License-Apache%202.0-red.svg)](https://opensource.org/licenses/Apache-2.0)

## A CPU-based JSON Web Token (`JWT`) cracker and - _to some extent_ - scanner

`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:

- 

## Features

- Test against the following vulnerabilitie(s):

  - [CVE-2018-1000531](https://nvd.nist.gov/vuln/detail/CVE-2015-2951): `JWT` signature bypass due to the use of `None` hashing algorithm (`alg=none`)

- Guessing attacks against `JWT` private keys **signed with the `HS256` hashing algorithm**:

  - Brute-force attacks

  - Wordlist attacks

## Requirements

`jwtcat` is fully written in `Python 3` and **requires a minimum of `Python 3.6`** in addition to the following libraries:

- [coloredlogs](https://pypi.org/project/coloredlogs/)

- [PyJWT](https://pypi.org/project/PyJWT/)

- [tqdm](https://pypi.org/project/tqdm/)

## Installation

1. Clone the repository:

   ```bash

   git clone https://github.com/AresS31/jwtcat

   cd jwtcat

   ```

2. (Optional but recommended) Create and activate a new `Python` virtual environment:

   1. Create the virtual environment:

      ```bash

      python -m venv env

      ```

   2. Activate the newly created environment:

      - On `POSIX`:

        ```bash

        source ./env/bin/activate

        ```

      - On `Windows`:

        ```powershell

        ./env/Scripts/Activate.ps1

        ```

3. Install dependencies:

   ```bash

   python -m pip install -r requirements.txt

   ```

## Usage

- To list the available options:

  ```bash

  python jwtcat.py -h

  ```

- To list available options specific to brute force attacks:

  ```bash

  python jwtcat.py brute-force -h

  ```

  ![brute-force-demo](./images/brute-force_demo_cropped.gif)

- To list available options specific to wordlist attacks:

  ```bash

  python jwtcat.py wordlist -h

  ```

  ![wordlist-demo](./images/wordlist_demo_cropped.gif)

- To test a `JWT` against [CVE-2018-1000531](https://nvd.nist.gov/vuln/detail/CVE-2015-2951) and `HS256` brute-force attacks:

  ```bash

  python jwtcat.py vulnerable -h

  ```

  ![vulnerable-demo](./images/vulnerable_demo_cropped.gif)

## Roadmap

- [ ] Implement additional attack vectors.

- [ ] Implement support for multithreading or multiprocessing.

- [ ] Implement support for the `-tF, --token-file` swicth.

- [ ] Improve the code logic for:

  - [ ] `TQDM` integration with the `logger`.

- [ ] Improve the script performances.

## Changelog

### v1.1 - May 2020:

- Added checks to see if `JWT` is signed with `HS256`.

- Added checks to see if `JWT` is vulnerable to [CVE-2018-1000531](https://nvd.nist.gov/vuln/detail/CVE-2015-2951).

- Added `potfile` options.

- Added support for brute-force attacks.

- Code refactoring.

- Improved the standard output formatting.

- Switched from `python-colorlog` to `coloredlogs`.

## Sponsor 💖

If you want to support this project and appreciate the time invested in developping, maintening and extending it; consider donating toward my next cup of coffee. ☕

It is easy, all you got to do is press the `Sponsor` button at the top of this page or alternatively [click this link](https://github.com/sponsors/aress31). 💸

## Reporting Issues

Found a bug? I would love to squash it! 🐛

Please report all issues on the GitHub [issues tracker](https://github.com/aress31/jwtcat/issues).

## Contributing

You would like to contribute to better this project? 🤩

Please submit all `PRs` on the GitHub [pull requests tracker](https://github.com/aress31/jwtcat/pulls).

## License

See [LICENSE](LICENSE).