jwtXploiter – A Tool To Test Security Of Json Web Token

A tool to test security of JSON Web Tokens. Test a JWT against all known CVEs;

• Tamper with the token payload: changes claims and subclaims values.
• Exploit known vulnerable header claims (kid, jku, x5u)
• Verify a token
• Retrieve the public key of your target’s ssl connection and try to use it in a key confusion attack with one option only
• All JWAs supported
• Generates a JWK and insert it in the token header
• And much, much more!

Wiki

• Read the wiki! wiki

Installation

N.B. Cloning the repository should be avoided except for development purposes! N.B. Deb package has to be considered beta

• With rpm:

  wget http://andreatedeschi.uno/jwtxploiter/jwtxploiter-1.2.1-1.noarch.rpm
  sudo rpm --install jwtxploiter-1.2.1-1.noarch.rpm

  or, if previous version is installed on your machine

  sudo rpm --upgrade jwtxploiter-1.2.1-1.noarch.rpm

• With pip:

  sudo pip install jwtxploiter

• With deb:

  wget http://andreatedeschi.uno/jwtxploiter/jwtxploiter_1.2.1-1_all.deb
  sudo dpkg -i jwtxploiter_1.2.1-1_all.deb

• Cloing the repo:

  git clone https://github.com/DontPanicO/jwtXploiter.git
  ./install.sh

N.B. python3-pip package is required to install dependencies, be sure to have it installed.

Who this tool is written for?

• Web Application Penetration Tester / Bug Bounty Hunters

  • This tool has been written with the aim of become a key part of pentesters toolkit.

• Devs who need to test the secuirty of JWTs used in their applications

• CTF Players

• Not For Students

  • Since this tool automates lot of stuff, without force the user to know what’s happening under the hood, it won’t help you to understand the vulnerabilities it exploits.

To Know

• For attacks that generates a jwks file, you could find it in the current working directory. Remeber to deletes such files in order to avoid conflicts.

• For jku/x5u injection that needs to merge two urls (the server vulnerable url and your one), the HERE keyword is required.

• For redirect attacks the keyword should replace the redirect url, e.g.

  • http://app.com/foo?redirect=bar&some=thing –> http://app.com/foo?redirect=HERE&some=thing

• For jku/x5u injections via HTTP header injection attacks, the HERE keyword sould be appended to the vulnerable parameter, without replacing its value, e.g.

  • http://app.com/foo?param=value –> http://app.com/foo?param=valueHERE

• Also, in such cases, be sure to pass the server url and your one as comma separated values.

• ‘/.well-known/jwks.json’ is automatically appended to your url in jku/x5u attacks. So make sure to place the jwks file under this path on your server.

• If you don’t want that happen, use the –manual option, but this option is compatible only with –jku-basic and –x5u-basic so, you will need to manually craft the url and pass it to those options, even for attacks that exploit Open Redirect or HTTP header injection.

• Look at the wiki for a detailed documentation.