Submission Details
Severity:
M-02. [M-2] Denial of Service (DOS) via Block Gas Limit
Summary
Games with a large number of turns could potentially hit the block gas limit during the commit-reveal phases, thereby making the game unplayable.
Vulnerability Details
Proof of Concept
function testGasLimitDoS() public {
// Create game with extremely large number of turns
// This will cause out-of-gas errors when processing turns
vm.prank(playerA);
gameId = game.createGameWithEth{value: BET_AMOUNT}(
type(uint256).max,
TIMEOUT
);
}
Impact
An attacker can create games with an extreme high number of turns, thereby rendering the contract unusable or funds to be locked.
Tools Used
Foundry
VS Code
Recommendations
Implement a reasonable upper limit on the number of turns.
Add a gas limit check in the
createGameWithEthfunction.Lastly, you should consider gas usage when creating a multi-turn game.
Rewards breakdown
nSLOC
349This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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