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A bank application allows users to query their account balance and the admin user has the capability to modify the account balance of any user. The bank application makes use of JWT tokens for authorization purposes.
The developers have recently released a feature to allow users to transfer money to an account (using the recipient's email id) but they forgot to place input validation checks on the transferred amount.
Note: Once the account balance exceeds $5000, the user gets a Golden Ticket.
Objective: Leverage the issue to increase the balance and get the Golden Ticket.
Information of Jake's friend:
|/balance||Read the balance of an account||GET||email, token|
|/balance||Modify the account balance||POST||email, token, balance|
|/goldenticket||Get the Golden Ticket from the Bank API||POST||token|
- This lab is dedicated to you! No other users are on this network :)
- Once you start the lab, you will have access to a Kali GUI instance.
- Your Kali instance has an interface with IP address 192.X.Y.2. Run "ifconfig" to know the values of X and Y.
- The bank application should be running on port 5000 on the machine located at the 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.
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