Web3/The Ethernaut

// SPDX-License-Identifier: MITpragma solidity ^0.8.0;import "openzeppelin-contracts-08/token/ERC20/IERC20.sol";import "openzeppelin-contracts-08/token/ERC20/ERC20.sol";import "openzeppelin-contracts-08/access/Ownable.sol";contract DexTwo is Ownable { address public token1; address public token2; constructor() {} function setTokens(address _token1, address _token2) public onlyOwner {..

// SPDX-License-Identifier: MITpragma solidity ^0.8.0;import "openzeppelin-contracts-08/token/ERC20/IERC20.sol";import "openzeppelin-contracts-08/token/ERC20/ERC20.sol";import "openzeppelin-contracts-08/access/Ownable.sol";contract Dex is Ownable { address public token1; address public token2; constructor() {} function setTokens(address _token1, address _token2) public onlyOwner { ..

// SPDX-License-Identifier: MITpragma solidity ^0.8.0;interface Buyer { function price() external view returns (uint256);}contract Shop { uint256 public price = 100; bool public isSold; function buy() public { Buyer _buyer = Buyer(msg.sender); if (_buyer.price() >= price && !isSold) { isSold = true; price = _buyer.price(); } }} 얘도 문제를 애매하..

If you can deny the owner from withdrawing funds when they call withdraw() (whilst the contract still has funds, and the transaction is of 1M gas or less) you will win this level.// SPDX-License-Identifier: MITpragma solidity ^0.8.0;contract Denial { address public partner; // withdrawal partner - pay the gas, split the withdraw address public constant owner = address(0xA9E); uint256 ti..

// SPDX-License-Identifier: MITpragma solidity ^0.5.0;import "../helpers/Ownable-05.sol";contract AlienCodex is Ownable { bool public contact; bytes32[] public codex; modifier contacted() { assert(contact); _; } function makeContact() public { contact = true; } function record(bytes32 _content) public contacted { codex.push(_content); } func..