Core Contracts
Regnum Aurum Acquisition Corp
HardhatReal World AssetsNFT
77,280 USDC
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Submission Details
Severity: high
Valid

RAAC reward calculation is not time-based

dentonylifer

Summary

RAAC reward calculation is not time-based and depends only on userDeposit and can be abused by frequent withdraw() calls.

Vulnerability Details

Link

RAAC reward calculation is not time-based and depends only on userDeposit:

function calculateRaacRewards(address user) public view returns (uint256) {
uint256 userDeposit = userDeposits[user];
uint256 totalDeposits = deToken.totalSupply();
​
uint256 totalRewards = raacToken.balanceOf(address(this));
if (totalDeposits < 1e6) return 0;
​
return (totalRewards * userDeposit) / totalDeposits;
}

Malicious user can abuse this by first depositing large amounts of RToken, then calling withdraw() with deCRVUSDAmount = 1 multiple times, and his rewards will be calculated during every call using almost unchanged userDeposits value.

uint256 rcrvUSDAmount = calculateRcrvUSDAmount(deCRVUSDAmount);
uint256 raacRewards = calculateRaacRewards(msg.sender);
if (userDeposits[msg.sender] < rcrvUSDAmount) revert InsufficientBalance();
userDeposits[msg.sender] -= rcrvUSDAmount;
​
if (userDeposits[msg.sender] == 0) {
delete userDeposits[msg.sender];
}
​
deToken.burn(msg.sender, deCRVUSDAmount);
rToken.safeTransfer(msg.sender, rcrvUSDAmount);
if (raacRewards > 0) {
raacToken.safeTransfer(msg.sender, raacRewards);
}

Impact

User can steal all RAAC tokens from stability pool.

Tools Used

Manual review.

Recommendations

Calculate rewards based on duration of user deposit and resets user rewards to 0 after rewards was claimed.

Updates

Lead Judging Commences

inallhonesty Lead Judge 7 months ago
Submission Judgement Published
Validated
Assigned finding tags:

StabilityPool::withdraw can be called with partial amounts, but it always send the full rewards

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