Potential Risk:
The _vote function in the CultureIndex contract takes two parameters: pieceId and voter. While the function includes some input validation checks, there are some potential issues and missing checks that should be addressed.
Proof of Concept (PoC):
Consider a scenario where an attacker attempts to vote for a piece with an invalid pieceId or an invalid voter address:
// Attempt to vote with an invalid pieceId
_vote(MAX_PIECE_ID + 1, msg.sender);
// Attempt to vote with an invalid voter address
_vote(pieceId, address(0));
In these PoC examples, an attacker tries to vote with an out-of-range pieceId and an invalid voter address. The _vote function should have additional checks to prevent such scenarios.
Recommended Mitigation Steps:
To mitigate the risk of using invalid pieceId or voter addresses, consider adding or enhancing input validation checks within the _vote function. Here’s a recommended solution:
function _vote(uint256 pieceId, address voter) internal {
require(pieceId < _currentPieceId, “Invalid piece ID”);
require(voter != address(0), “Invalid voter address”);
require(!pieces[pieceId].isDropped, “Piece has already been dropped”);
require(votes[pieceId][voter].voterAddress == address(0), “Already voted”); // Updated this check
require(_getPastVotes(voter, pieces[pieceId].creationBlock) > minVoteWeight, “Weight must be greater than minVoteWeight”);
uint256 weight = _getPastVotes(voter, pieces[pieceId].creationBlock);
votes[pieceId][voter] = Vote(voter, weight);
totalVoteWeights[pieceId] += weight;
uint256 totalWeight = totalVoteWeights[pieceId];
// TODO add security consideration here based on block created to prevent flash attacks on drops?
maxHeap.updateValue(pieceId, totalWeight);
emit VoteCast(pieceId, voter, weight, totalWeight);
}
In this solution:
By implementing this solution, you can reduce the risk of issues related to invalid input parameters when voting for a piece.
Invalid Validation
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