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A REST API is running on the target machine and uses JWT based authentication. The implementation of JWT is very crucial for the safety of an API. One should never rely on data sent by the user for creating the JWT token until the data is sanitized. What happens when the API accepts the user input for token creation?
The developers of the API use the username provided by the user to issue them a token. The username is appended to the payload and the JSON created from it is passed to the library to create a JWT Token. Interact with the API and explore how this implementation might be disastrous.
Objective: Your task is to get the Golden Ticket!
- This lab is dedicated to you! No other users are on this network :)
- Once you start the lab, you will have access to a Ubuntu CLI instance.
- Your Ubuntu instance has an interface with IP address 192.X.Y.2. Run "ifconfig" to know the values of X and Y.
- The REST API is running on port 8080 on the target machine having IP address 192.X.Y.3.
- Do not attack the gateway located at IP address 192.X.Y.1
The following activities are strictly prohibited on this website unless otherwise explicitly stated as allowed in the mission statement:
- Using automated scanners
- Using brute force attacks
- Denial of Service attacks
- Attacking other student machines in challenges where you might achieve a shell on the vulnerable system
- Attacking the lab infrastructure
Users violating the above will be either temporarily or permanently banned from the website.
If you are unsure about an activity, then please contact support to confirm that it is allowed on our website.
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