First Flight #14: AirDropper
First Flight #14
Beginner FriendlyDeFiFoundry
100 EXP
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Submission Details
Severity: high
Valid

Incorrect USDC address in `Deploy.s.sol`

n0kto

Description

Two different addresses are used for USDC in the deployment script. The first one, used in the MerkleAirdrop contract creation, is incorrect, leading to an inability to claim the airdrop. The second one is correct and sends the amount of the airdrop. Since the owner can only retrieve the fee (ether), the USDC airdrop will be stuck in the contract.

1st address on ZkSync explorer (incorrect one): https://explorer.zksync.io/address/0x1D17CbCf0D6d143135be902365d2e5E2a16538d4
2nd address on ZkSync explorer (correct one): https://explorer.zksync.io/address/0x1d17CBcF0D6D143135aE902365D2E5e2A16538D4

contract Deploy is Script {
@> address public s_zkSyncUSDC = 0x1D17CbCf0D6d143135be902365d2e5E2a16538d4;
bytes32 public s_merkleRoot = 0xf69aaa25bd4dd10deb2ccd8235266f7cc815f6e9d539e9f4d47cae16e0c36a05;
// 4 users, 25 USDC each
uint256 public s_amountToAirdrop = 4 * (25 * 1e6);
​
// Deploy the airdropper
function run() public {
vm.startBroadcast();
@> MerkleAirdrop airdrop = deployMerkleDropper(s_merkleRoot, IERC20(s_zkSyncUSDC));
// Send USDC -> Merkle Air Dropper
@> IERC20(0x1d17CBcF0D6D143135aE902365D2E5e2A16538D4).transfer(address(airdrop), s_amountToAirdrop);
vm.stopBroadcast();
}
​
function deployMerkleDropper(bytes32 merkleRoot, IERC20 zkSyncUSDC) public returns (MerkleAirdrop) {
return (new MerkleAirdrop(merkleRoot, zkSyncUSDC));
}
}

Risk

Likelyhood: High

  • The contract will never send USDC to users.

Impact: High

  • Loss of funds, stuck in the MerkleAirdrop contract.

Recommended Mitigation

  • Replace the s_zkSyncUSDC contract address with the correct one and use this variable instead of using the hexadecimal address.

  • Add fork tests to verify with external contracts (USDC).

contract Deploy is Script {
- address public s_zkSyncUSDC = 0x1D17CbCf0D6d143135be902365d2e5E2a16538d4;
+ address public s_zkSyncUSDC = 0x1d17CBcF0D6D143135aE902365D2E5e2A16538D4;
bytes32 public s_merkleRoot = 0xf69aaa25bd4dd10deb2ccd8235266f7cc815f6e9d539e9f4d47cae16e0c36a05;
// 4 users, 25 USDC each
uint256 public s_amountToAirdrop = 4 * (25 * 1e6);
​
// Deploy the airdropper
function run() public {
vm.startBroadcast();
MerkleAirdrop airdrop = deployMerkleDropper(s_merkleRoot, IERC20(s_zkSyncUSDC));
// Send USDC -> Merkle Air Dropper
- IERC20(0x1d17CBcF0D6D143135aE902365D2E5e2A16538D4).transfer(address(airdrop), s_amountToAirdrop);
+ IERC20(s_zkSyncUSDC).transfer(address(airdrop), s_amountToAirdrop);
vm.stopBroadcast();
}
​
function deployMerkleDropper(bytes32 merkleRoot, IERC20 zkSyncUSDC) public returns (MerkleAirdrop) {
return (new MerkleAirdrop(merkleRoot, zkSyncUSDC));
}
}
Updates

Lead Judging Commences

inallhonesty Lead Judge about 1 year ago
Submission Judgement Published
Validated
Assigned finding tags:

usdc-wrong-address

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