Validity check missing in Frontier
ImpactIn the newly introduced signed Frontier-specific extrinsic for `pallet-ethereum`, a large part of transaction validation logic was only called in transaction pool validation, but not in block execution. Malicious validators can take advantage of this to put invalid transactions into a block.The attack is limited in that the signature is always validated, and the majority of the validation is done again in the subsequent `pallet-evm` execution logic. However, do note that a chain ID replay attack was possible. In addition, spamming attacks are of main concerns, while they are limited by Substrate block size limits and other factors.PatchesThe issue is patched in commit 146bb48849e5393004be5c88beefe76fdf009aba.ReferencesPatch PR: https://github.com/paritytech/frontier/pull/495For more informationIf you have any questions or comments about this advisory:Open an issue in [Frontier repo](https://github.com/paritytech/frontier/issues)Special thanksSpecial thanks to @librelois, @nanocryk and the Moonbeam team for reporting and fixing this security vulnerability.