Submission Details
Severity:
Weak PRNG
Summary
Weak PRNG due to block.timestamp.
Vulnerability Details
'''solidity
@>uint256 winnerIndex =
uint256(keccak256(abi.encodePacked(msg.sender, block.timestamp, block.difficulty))) % players.length;
'''
Impact
Some function calls guessing and re-orders the block containing the transaction.
Tools Used
-slither
foundry
Recommendations
Do not use block.timestamp, now or blockhash as a source of randomness.
Updates
Lead Judging Commences
Hamiltonite over 1 year ago
Submission Judgement Published Assigned finding tags:
weak-randomness
Root cause: bad RNG Impact: manipulate winner
Rewards breakdown
nSLOC
143This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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