rvierdiiev - Missing checks for whether Arbitrum Sequencer is active

[sherlock-admin]

rvierdiiev

medium

Missing checks for whether Arbitrum Sequencer is active

Summary

PriceOracle doesn't check whether the Arbitrum Sequencer is active when using prices from chainlink oracle.

Vulnerability Detail

Iron Bank protocol is going to launch on arbitrum network.
PriceOracle is using chainlink oracle in order to get prices. Chainlink recommends to check if arbitrum sequencer is active in order to get fresh prices. Otherwise stale prices can be fetched.

Impact

PriceOracle can calculate prices incorrectly which can cause bad debt for a protocol.

Code Snippet

https://github.com/sherlock-audit/2023-05-ironbank/blob/main/ib-v2/src/protocol/oracle/PriceOracle.sol#L66-L72

Tool used

Manual Review

Recommendation

Check that sequencer is not down.

Duplicate of #440