First Flight #6: Voting Booth
First Flight #6
Beginner FriendlyFoundry
100 EXP
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Submission Details
Severity: high
Invalid

Closing a proposal with equal votes will make the protocol unusable.

djanerch

Summary

Close the proposal when both s_votersFor and s_votersAgainst are equal.

Vulnerability Details

The calculation in the vote function is incorrect because the if statement is valid when s_votersFor and s_votersAgainst are equal. This calculation is incorrect because it checks for all votes, not for true or false values:

if (totalCurrentVotes * 100 / s_totalAllowedVoters >= MIN_QUORUM && s_votersFor.length != s_votersAgainst.length) {
// mark voting as having been completed
s_votingComplete = true;
​
// distribute the voting rewards
_distributeRewards();
}

Impact

Closing a proposal with equal votes will make the protocol unusable.
Change test contract to work with 3 or 7 accounts and add following test case.

function testVoting_PoC() public {
vm.prank(address(0x1));
booth.vote(true);
​
vm.prank(address(0x2));
booth.vote(false);
​
//If you want to test test case for 7 accounts uncomment next lines and add 7 accounts in constructor
// vm.prank(address(0x3));
// booth.vote(true);
​
// vm.prank(address(0x4));
// booth.vote(false);
​
assertEq(booth.isActive(), false);
}

This test shows how two addresses vote; the first address votes true, the second address votes false, and the booth.isActive() function returns false. There is no 51% maturity, but the contract closes the proposal.

Tools Used

Manual Review

Recommendations

Check for s_votersFor.length and s_votersAgainst.length to be different.

+if (totalCurrentVotes * 100 / s_totalAllowedVoters >= MIN_QUORUM && s_votersFor.length != s_votersAgainst.length)
Updates

Lead Judging Commences

0xnevi Lead Judge
almost 2 years ago
0xnevi Lead Judge almost 2 years ago
Submission Judgement Published
Validated
Assigned finding tags:

VotingBooth.vote: In certain scenarios, proposal can pass when for and against votes are equal

t0x1c Auditor
almost 2 years ago
billobaggebilleyan Auditor
almost 2 years ago
0xnevi Lead Judge
almost 2 years ago
djanerch Submitter
almost 2 years ago
0xnevi Lead Judge
almost 2 years ago
0xnevi Lead Judge almost 2 years ago
Submission Judgement Published
Invalidated
Reason: Design choice

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