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Submission Details
Severity: medium
Invalid

No check if Arbitrum L2 sequencer is down in Chainlink feeds

ubl4nk

Summary

Using Chainlink in L2 chains such as Arbitrum requires to check if the sequencer is down to avoid prices from looking like they are fresh although they are not.

The bug could be leveraged by malicious actors to take advantage of the sequencer downtime.

Vulnerability Details

There is no check that the sequencer is down in distributeAssets:

function distributeAssets(ILiquidationPoolManager.Asset[] memory _assets, uint256 _collateralRate, uint256 _hundredPC) external payable {
consolidatePendingStakes();
(,int256 priceEurUsd,,,) = Chainlink.AggregatorV3Interface(eurUsd).latestRoundData();
uint256 stakeTotal = getStakeTotal();
uint256 burnEuros;
uint256 nativePurchased;
for (uint256 j = 0; j < holders.length; j++) {
Position memory _position = positions[holders[j]];
uint256 _positionStake = stake(_position);
if (_positionStake > 0) {
for (uint256 i = 0; i < _assets.length; i++) {
ILiquidationPoolManager.Asset memory asset = _assets[i];
if (asset.amount > 0) {
(,int256 assetPriceUsd,,,) = Chainlink.AggregatorV3Interface(asset.token.clAddr).latestRoundData();

Impact

If the sequencer goes down, the oracles may have stale prices, if this happens, then the costInEuros and also the reward will be calculated wrongly.

Tools Used

Manual Review

Recommendations

It is recommended to follow the code example of Chainlink:
https://docs.chain.link/data-feeds/l2-sequencer-feeds#example-code

Updates

Lead Judging Commences

hrishibhat Lead Judge over 1 year ago
Submission Judgement Published
Validated
Assigned finding tags:

Arbitrum-sequncer

hrishibhat Lead Judge over 1 year ago
Submission Judgement Published
Invalidated
Reason: Known issue
Assigned finding tags:

Arbitrum-sequncer

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