Description:
There is a new metatoken in the market. Alice and Bob have already bought it. Don't miss out on it
How to Submit a Solution:
Use the below submission form to submit the solution 👇🏽: https://quillaudits.typeform.com/QuillCTF
Objective of CTF
Drain as much eth+weth you can from every contract and meet the assertions
Note: You can create POCs using Foundry/Hardhat. Without proper POC, your submissions will not be accepted.
Georli Link:
Contract Code:
Please find the contracts to audit in a compressed .zip file below 👇🏽:
Contracts_MetaToken
Foundry Setup
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;
import "forge-std/Test.sol";
import "../src/CurvePool.sol";
import "../src/CurveToken.sol";
import "../src/interfaces/ILendingPool.sol";
import "../src/MetaPoolToken.sol";
import "../src/interfaces/IERC3156.sol";
import "forge-std/console.sol";
contract Challenge is Test {
ILendingPool public wethLendingPool;
CurvePool public swapPoolEthWeth;
CurveToken public lpToken;
IWETH public weth;
MetaPoolToken public metaToken;
address hacker;
address alice;
address bob;
function setUp() public {
vm.createSelectFork("https://sepolia.gateway.tenderly.co");
weth = IWETH(payable(0x1194A239875cD36C9B960FF2d3d8d0f800435290));
wethLendingPool = ILendingPool(0x66Df966E887e73b2f46456e062213B0C0fB42037);
assertEq(address(wethLendingPool.WETH()), address(weth));
assertEq(address(wethLendingPool.WETH()), address(weth));
lpToken = new CurveToken();
swapPoolEthWeth = new CurvePool(
msg.sender,
[
0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE,
address(weth)
],
address(lpToken),
5,
4000000,
5000000000
);
lpToken.initialize(address(swapPoolEthWeth));
metaToken = new MetaPoolToken(lpToken, swapPoolEthWeth);
// deal(address(lpToken), address(metaToken), 10000 ether, true);
hacker = makeAddr("hacker");
alice = makeAddr("alice");
bob = makeAddr("bob");
uint[2] memory amounts;// = [10 ether, 10 ether];
amounts[0] = 10 ether;
amounts[1] = 10 ether;
deal(alice, 20 ether);
vm.startPrank(alice);
weth.deposit{value: 10 ether}();
assertEq(weth.balanceOf(alice), 10 ether, "alice failed");
weth.approve(address(swapPoolEthWeth), type(uint).max);
swapPoolEthWeth.add_liquidity{value: 10 ether}(amounts, 0);
lpToken.approve(address(metaToken), type(uint).max);
metaToken.mint(lpToken.balanceOf(alice));
assertGt(metaToken.balanceOf(alice),0);
vm.stopPrank();
// amounts = [20 ether, 20 ether];
amounts[0] = 20 ether;
amounts[1] = 20 ether;
deal(bob, 40 ether);
vm.startPrank(bob);
weth.deposit{value: 20 ether}();
assertEq(weth.balanceOf(bob), 20 ether, "bob failed");
weth.approve(address(swapPoolEthWeth), type(uint).max);
swapPoolEthWeth.add_liquidity{value: 20 ether}(amounts, 0);
lpToken.approve(address(metaToken), type(uint).max);
metaToken.mint(lpToken.balanceOf(bob));
assertGt(metaToken.balanceOf(bob),0);
vm.stopPrank();
// Provide initial liquidity to lending pool (and lots of it!)
deal(address(this), type(uint256).max - 70 ether);
weth.deposit{value: address(this).balance}();
weth.transfer(address(wethLendingPool), weth.balanceOf(address(this)));
// Provide hacker with some ETH to start with
deal(hacker, 10 ether);
}
function testHack() public {
uint lendingPoolWethBalance = weth.balanceOf(address(wethLendingPool));
vm.startPrank(hacker, hacker);
//Your Solution
vm.stopPrank();
assertLt(weth.balanceOf(address(wethLendingPool)), lendingPoolWethBalance, "Did not steal WETH from LendingPool");
assertApproxEqAbs(lpToken.balanceOf(address(metaToken)), 0, 1e5, "Did not completely drain LP tokens from MetaPoolToken");
assertApproxEqRel(address(hacker).balance / weth.balanceOf(address(wethLendingPool)), 200, 5, "Did not obtain approx. 200x as much ETH as the final WETH lending pool balance");
}
}‣
Learning Materials:
Solutions:
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