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ID:

cronos-1116

Date:

Status:

Incident Count:

December 12, 2021

Near-Miss

2

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REKT

Contributor:

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web3rekt.com

KYC By:

KYC:

None

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Audit By:

Audits:

None

Loss Amount:

-

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Recovered:

-

Rewards:

40,000

Currency:

USD

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Key Indicators

Platform:

Type:

Category:

Method:

Data Sources:

Cronos

Network

Chain

Near-Miss

Extended Method:

Incorrect gas limit and gas refund

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Days in Operation:

440

(1.21 Years)

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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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