highFront-running / MEVEVM-Solidity
Biconomy: Theft of funds under relaying the transaction
- Payout
- $0
- Protocol
- Biconomy
- Disclosed
- Mar 3, 2023
- Source
- code4rena
In Biconomy's SmartAccount contract, relayed transactions compute gas refunds using an assumed average gas cost of 8 gas per calldata byte. An attacker can front-run legitimate relayed transactions and append zero-padded trailing bytes to the calldata. Because …
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References
- https://github.com/code-423n4/2023-01-biconomy-findings/issues/489
- https://github.com/code-423n4/2023-01-biconomy-findings
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