In this challenge the user is provided with a contract instance upon calling the Get Instance button on the page. The challenge is to retrieve the password hidden in the contract & call authenticate() with a password. If the user enters correct passord the isCleared flag becomes true & level is assumed to be cleared.
This challenge requires user to be familiar with the following concepts.
- Contract Instances that allows users to interact with the blockchain.
- Basic working of Web3.JS library. i.e ABI & contract deployment.
The user needs to navigate through the contract instance by opening up chrome debugger! Ctrl + Shift + i & type contract. (notice the '.') to navigate to the list of functions available. Calling await contract.password() retrives the password that is ethernaut0. Calling await contract.authenticate('ethernaut0') sets the flag to true.
However, I have solved the Challenge-0 using a contract that can be found in test/Challenge0.sol.
- Run Exploit!
forge test -vv -m test_challenge_0