Weight not properly refunded after EVM execution
Moderate severity
GitHub Reviewed
Published
Sep 23, 2022
in
polkadot-evm/frontier
•
Updated Jan 27, 2023
Description
Published to the GitHub Advisory Database
Sep 23, 2022
Reviewed
Sep 23, 2022
Published by the National Vulnerability Database
Sep 24, 2022
Last updated
Jan 27, 2023
Impact
Previously, the worst case weight was always accounted as the block weight for all cases. In case of large EVM gas refunds, this can lead to block spamming attacks -- the adversary can construct blocks with transactions that have large amount of refunds or unused gases with reverts, and as a result inflate up the chain gas prices. This issue is fixed by properly refund unused weights after each EVM execution.
The impact of this issue is limited in that the spamming attack would still be costly for any adversary, and it has no ability to alter any chain state.
Patches
The issue is fixed in polkadot-evm/frontier#851
Workarounds
None.
References
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References