Submission Details
Severity:
No checks to see whether Arbitrum sequencer is down.
Summary
When utilizing Chainlink in L2 chains like Arbitrum, it's important to ensure that the prices provided are not falsely perceived as fresh, even when the sequencer is down. This vulnerability could potentially be exploited by malicious actors to gain an unfair advantage.
Vulnerability Details
No checks for Arbitrum sequencer in OracleLib
function staleCheckLatestRoundData(AggregatorV3Interface priceFeed)
public
view
returns (uint80, int256, uint256, uint256, uint80)
{
(uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound) =
priceFeed.latestRoundData();
uint256 secondsSince = block.timestamp - updatedAt;
if (secondsSince > TIMEOUT) revert OracleLib__StalePrice();
return (roundId, answer, startedAt, updatedAt, answeredInRound);
}
Impact
could potentially be exploited by malicious actors to gain an unfair advantage.
Tools Used
Manual review
Recommendations
Check the Chainlink docs: https://docs.chain.link/data-feeds/l2-sequencer-feeds#example-code
Prize pool breakdown
Total prize
15,000 USDC
nSLOC
23664 USDC / LOC
14,000 USDC
1,000 USDC
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