Submission Details
Severity:
Weak Randomness
Summary
Weak Randomness in different parts of the project
Vulnerability Details
In the ChoosingRam.sol contract we can see 2 instances of this weak randomness:
uint256 random = uint256(
keccak256(
abi.encodePacked(block.timestamp, block.prevrandao, msg.sender)
)
) % 2;
.
.
.
uint256 random = uint256(
keccak256(abi.encodePacked(block.timestamp, block.prevrandao))
) % ramNFT.tokenCounter();
Impact
Values are not random and therefore could be predicted.
Tools Used
Manual review
Recommendations
Use some off-chain random number generator such as Chainlink VRF
Updates
Lead Judging Commences
bube about 1 year ago
Submission Judgement Published Reason: Too generic
Assigned finding tags:
Weak randomness in `ChoosingRam::increaseValuesOfParticipants`
Rewards breakdown
nSLOC
218This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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