Signature Verification for _verifyVoteSignature 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 _verifyVoteSignature function in the CultureIndex contract is responsible for verifying signatures for specific votes. While it attempts to verify signatures, there are potential risks associated with signature verification.

Proof of Concept (PoC): Signature verification can be challenging and may lead to vulnerabilities if not implemented correctly. Attackers could potentially exploit weaknesses in the verification process. For example, an attacker might craft signatures that appear valid but contain malicious data or 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 signatures. Verify the following:

1. Ensure that the deadline, v, r, and s parameters are validated to prevent the use of expired signatures or invalid components.
2. Verify that the recovered address from the signature (recoveredAddress) matches the from address.
3. Check if the from address is not the zero address (address(0)) to prevent potential issues related to invalid addresses.

It's essential 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 in the _verifyVoteSignature function, and you should adapt it to your specific requirements and security considerations:

function _verifyVoteSignature( address from, uint256[] calldata 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 voteHash = keccak256(abi.encode(VOTE_TYPEHASH, from, pieceIds, nonces[from], deadline));

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

// Ensure to address is not 0
require(from != address(0), "Invalid 'from' address");

// Ensure signature is valid
require(recoveredAddress != address(0) && recoveredAddress == from, "Invalid signature");

return true;

}

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

By following best practices for signature verification and thoroughly testing the functionality, you can reduce the risk associated with the _verifyVoteSignature 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