Snowman Merkle Airdrop
First Flight #42
Beginner FriendlyFoundrySolidityNFT
100 EXP
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Submission Details
Severity: high
Valid

Typo in EIP-712 hash

neomartis

Root + Impact

Description

  • Typo in MESSAGE_TYPEHASHf where addres should be address, a small error with big impact and easily resolved.

// Typo below addres should be adress
@> bytes32 private constant MESSAGE_TYPEHASH = keccak256("SnowmanClaim(addres receiver, uint256 amount)"); // keccak256 hash of the SnowmanClaim struct's type signature, used for EIP-712 compliant message signing
​

Risk

Likelihood:

  • The MESSAGE_TYPEHASH is a constant, baked into the code. So this error will happen on all requests to claim a showman.

  • MESSAGE_TYPEHASHCannot be changed after deployment

Impact:

  • Results in incorrect hash from getMessageHash which then fails _isValidSignature, resulting in SA__InvalidSignature even though the user should be able to claimSnowman

Recommended Mitigation

- bytes32 private constant MESSAGE_TYPEHASH = keccak256("SnowmanClaim(addres receiver, uint256 amount)"); // keccak256 hash of the SnowmanClaim struct's type signature, used for EIP-712 compliant message signing
+ bytes32 private constant MESSAGE_TYPEHASH = keccak256("SnowmanClaim(address receiver, uint256 amount)"); // keccak256 hash of the SnowmanClaim struct's type signature, used for EIP-712 compliant message signing
Updates

Lead Judging Commences

yeahchibyke Lead Judge 3 months ago
Submission Judgement Published
Validated
Assigned finding tags:

Inconsistent MESSAGE_TYPEHASH with standard EIP-712 declaration

A typo in the `MESSAGE_TYPEHASH` variable of the `SnowmanAirdrop` contract will prevent signature verification claims. Used `addres` instead of `address`

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