Level 1 Noob Hacker

Ethernaut 04 Telephone

0 / 100 EXP 100 EXP to Junior Hacker

0%

Challenge 4 / Ethernaut

Telephone

Goal

Change the Telephone owner to the player address.

Your task

Read Telephone.sol, then complete Exploit.s.sol.

:~/targets/ethernaut-telephone$

Sign in to run

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Telephone {
    address public owner;

    constructor() {
        owner = msg.sender;
    }

    function changeOwner(address _owner) public {
        if (tx.origin != msg.sender) {
            owner = _owner;
        }
    }
}

Starter exploit

Exploit.s.sol

Read-only

// TODO: implement the exploit.
contract HelperContract {

}

function run() external {
    vm.startBroadcast(PLAYER_PRIVATE_KEY);

    vm.stopBroadcast();
}

Ready to test your exploit? The starter code is yours to inspect. Sign in to edit it, run Foundry, and keep every clear.