Telephone

Goal

Change the Telephone owner to the player address.

Your task

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

:~/targets/ethernaut-telephone$

// 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

// Already wired up for you - do NOT add imports or a contract wrapper:
//   telephoneInstance -> the deployed Telephone contract
//   PLAYER_PRIVATE_KEY / PLAYER_ADDRESS -> your key and address
// Write only the code below.

contract HelperContract {
    // TODO: implement the exploit.
}

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

    // TODO: implement the exploit.

    vm.stopBroadcast();
}

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Telephone

Goal

Your task

Telephone

Exploit.s.sol

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