SCH CTF Arena
Level 1 Noob Hacker
Ethernaut 17 Preservation
0 / 100 EXP 100 EXP to Junior Hacker
0%

Challenge 17 / Ethernaut

Preservation

Goal

  1. Become the owner of the Preservation contract.

Your task

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

:~/targets/ethernaut-preservation$
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract LibraryContract {
    uint256 public storedTime;

    function setTime(uint256 time) external {
        storedTime = time;
    }
}

/// @notice Adapted from OpenZeppelin Ethernaut level 16.
contract Preservation {
    address public timeZone1Library;
    address public timeZone2Library;
    address public owner;
    uint256 public storedTime;

    constructor(address libraryOne, address libraryTwo) {
        timeZone1Library = libraryOne;
        timeZone2Library = libraryTwo;
        owner = msg.sender;
    }

    function setFirstTime(uint256 timeStamp) external {
        timeZone1Library.delegatecall(abi.encodeWithSignature("setTime(uint256)", timeStamp));
    }

    function setSecondTime(uint256 timeStamp) external {
        timeZone2Library.delegatecall(abi.encodeWithSignature("setTime(uint256)", timeStamp));
    }
}