Beanstalk: The Finale
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Submission Details
Severity: medium
Valid

`LibTractor` has an incorrect EIP712 domain separator.

bladesec

Github link

https://github.com/Cyfrin/2024-05-beanstalk-the-finale/blob/9c7b9fd521ad7cbe65cc788df181887c0eb39c6d/protocol/contracts/libraries/LibTractor.sol#L177

Summary

LibTractor has an incorrect EIP712 domain separator.

Vulnerability Details

_domainSeparatorV4() should use EIP712_TYPE_HASH but uses BLUEPRINT_TYPE_HASH wrongly.

bytes32 private constant EIP712_TYPE_HASH =
keccak256(
"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
);
bytes32 public constant BLUEPRINT_TYPE_HASH =
keccak256(
"Blueprint(address publisher,bytes data,bytes operatorData,uint256 maxNonce,uint256 startTime,uint256 endTime)"
);
​
function _domainSeparatorV4() internal view returns (bytes32) {
return
keccak256(
abi.encode(
BLUEPRINT_TYPE_HASH, //@audit wrong hash
TRACTOR_HASHED_NAME,
TRACTOR_HASHED_VERSION,
C.getChainId(),
address(this)
)
);
}

So _domainSeparatorV4() returns an incorrect domain separator and will cause the signature verification to fail.

Impact

The permit transactions wouldn't work with the wrong domain separator.

Tools Used

Manual Review

Recommendations

_domainSeparatorV4() should use EIP712_TYPE_HASH instead of BLUEPRINT_TYPE_HASH.

Updates

Lead Judging Commences

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

Tractor not compliant to EIP712 requirement because it's using the type hash of the blueprint, not the EIP712Domain

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