Project
One World
NFTDeFi
15,000 USDC
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Submission Details
Severity: medium
Invalid

Insufficient Validation on maxMembers in MembershipFactory

axicnode398

Issue: The maxMembers value is only enforced during the initial DAO creation and not consistently validated across other functions. While some parts of the contract validate the maximum member limit, it’s not consistently enforced in tier upgrades or other operations.

impact: Exceeding the maxMembers could lead to an overflow of members within a DAO, which can disrupt operations and cause unintended behavior.

Exploit:

maxMembers is only validated in createNewDAOMembership but not consistently enforced during joinDAO and upgradeTier. This oversight allows an attacker to bypass maxMembers and inflate the membership count beyond intended limits.

Location of Code:

  • MembershipFactory.sol:

    // maxMembers validated only in createNewDAOMembership
    require(totalMembers <= daoConfig.maxMembers, "Sum of tier amounts exceeds maxMembers.");

  • joinDAO does not enforce maxMembers:

function joinDAO(address daoMembershipAddress, uint256 tierIndex) external {
// no maxMembers check here
}

Exploit Code:

A user joins a DAO repeatedly, inflating the membership count.

for (uint i = 0; i < 100; i++) {
membershipFactory.joinDAO(targetDAOAddress, tierIndex);
}

Code Change:

Add maxMembers validation in joinDAO and upgradeTier.

// Join DAO function with maxMembers validation
function joinDAO(address daoMembershipAddress, uint256 tierIndex) external {
DAOConfig storage daoConfig = daos[daoMembershipAddress];
require(daoConfig.tiers[tierIndex].amount > daoConfig.tiers[tierIndex].minted, "Tier full.");
require(getCurrentMemberCount(daoMembershipAddress) < daoConfig.maxMembers, "Membership full");
​
// Continue with the rest of joinDAO logic
}
​
// Helper function to get current member count
function getCurrentMemberCount(address daoAddress) internal view returns (uint256) {
uint256 memberCount = 0;
for (uint256 i = 0; i < daos[daoAddress].tiers.length; i++) {
memberCount += daos[daoAddress].tiers[i].minted;
}
return memberCount;
}
​

POC:

// Join DAO without enforcement on maxMembers.
function joinDAO(address daoMembershipAddress, uint256 tierIndex) external {
// No check here to ensure dao.maxMembers limit is respected.
}

  • Tools used : VSC, GIthub

  • Recommendation: Add validation in joinDAO and upgradeTier functions to ensure that maxMembers is enforced consistently, and restrict the total number of members across tiers.

Updates

Lead Judging Commences

0xbrivan2 Lead Judge 9 months ago
Submission Judgement Published
Invalidated
Reason: Incorrect statement
0xbrivan2 Lead Judge 9 months ago
Submission Judgement Published
Invalidated
Reason: Incorrect statement

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