mediumInteger overflow/underflowEVM-Solidity
zkSync: Operator can steal all gas provided by ANY user for `L1→L2` transactions
- Payout
- $0
- Protocol
- zkSync
- Disclosed
- Feb 29, 2024
- Source
- code4rena
zkSync's bootloader computes the gas refund returned to a user for an L1→L2 transaction in `processL1Tx`. The refund is assembled by adding the operator-controlled `refundGas`, selected via `max()`, to the unused `reservedGas` using a raw Yul `add` that has no …
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References
- https://github.com/code-423n4/2023-10-zksync-findings/issues/255
- https://github.com/code-423n4/2023-10-zksync-findings
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