Signature Verification for voteForManyWithSig Function

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Lines of code

https://github.com/code-423n4/2023-12-revolutionprotocol/blob/d42cc62b873a1b2b44f57310f9d4bbfdd875e8d6/packages/revolution/src/CultureIndex.sol#L419

Vulnerability details

Potential Risk: The voteForManyWithSig function in the CultureIndex contract allows users to vote on multiple pieceIds using a provided signature. While it attempts to verify the signature, there are some potential risks associated with signature verification.

Proof of Concept (PoC): In some cases, signature verification can be tricky and may lead to vulnerabilities if not implemented correctly. Attackers could potentially exploit weaknesses in the verification process. For example, an attacker might craft a signature that appears valid but contains malicious data, or they could provide invalid parameters to bypass the verification.

Recommended Mitigation Steps: To mitigate the risk associated with signature verification, ensure that the _verifyVoteSignature function correctly and securely verifies the provided signature. Verify the following:

1. Ensure that the _verifyVoteSignature function checks that the provided from address has the authority to vote on the specified pieceIds.
2. Confirm that the deadline parameter is validated to prevent the use of expired signatures.
3. Validate that the v, r, and s components are correctly formatted and used in the signature verification process.

It's important to use a well-established and secure signature verification library or function to perform these checks. Additionally, consider consulting with security experts to review and test the signature verification implementation thoroughly.

Here's a general outline of how you might implement the signature verification:

function _verifyVoteSignature( address from, uint256[] memory pieceIds, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal view returns (bool) { // Ensure the deadline is not expired require(block.timestamp <= deadline, "Signature has expired");

// Construct the message hash to be signed
bytes32 messageHash = keccak256(abi.encodePacked(from, pieceIds, deadline));

// Recover the signer's address from the signature
address signer = ecrecover(messageHash, v, r, s);

// Ensure the recovered signer matches the 'from' address
return signer == from;

}

This code demonstrates a simplified signature verification process, and you should adapt it to your specific requirements and security considerations.

By following best practices for signature verification and thoroughly testing the functionality, you can reduce the risk associated with the voteForManyWithSig function and enhance the security of your contract.

Assessed type

Invalid Validation

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raymondfam marked the issue as insufficient quality report

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raymondfam marked the issue as duplicate of #688

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MarioPoneder marked the issue as unsatisfactory: Insufficient proof