Incorrect gas limit and gas refund
Days in Operation:
Whitehat zb3 submitted the bug to Immunefi. It was reported as a high severity report due to being classified as a “theft of yield” — user rewards were affected but funds not drained. zb3 received a bounty of $40K for this find from the Cronos team, followed by a swift bug fix from the team.
The vulnerability is the related to the gas management. Since gas costs are not deducted, it’s possible to specify an arbitrary gas limit and then get “refunded” gas that wasn’t deducted in the first place, as the EthGasConsumeDecorator handler didn’t run because the ExtensionOptionsEthereumTx was missing.
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