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ID:

ethereum-alarm-clock-1227

Date:

Status:

Incident Count:

October 19, 2022

Verified

1

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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:

114,661

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Recovered:

-

Rewards:

Ticker:

USD

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Key Indicators

Platform:

Type:

Category:

Method:

Data Sources:

Ethereum

Dapp

Infrastructure & Tools

Contract Vulnerabilities

Extended Method:

Price arbitrage (gas fees)

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Days in Operation:

0

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Supremacy reported a vulnerability in Ethereum Alarm Clock allowing exploiter to steal $260k in gas fees, or a net profit of $114k after initial costs.

The Ethereum Alarm Clock enables users to schedule future transactions by pre-determining the receiver address, sent amount and desired time of transaction. Users must have the required Ether on hand to complete the transaction and need to pay the gas fees upfront.

According to Supremacy, the cancel function calculates the Transaction Fee (gas used * gas price) to be spent with the "gas used" over 85000 and transfers it to the caller (https://twitter.com/Supremacy_CA/status/1582789436995010560/photo/1).

But in fact, the hacker does not need to use more than 85000 gas, only 70355 is enough, the actual tx fee paid < the Transaction Fee returned by the cancel function, where the difference is the hacker profit (https://twitter.com/Supremacy_CA/status/1582789445492752384/photo/1)

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