CVE-2021-41138 Information

Description

Frontier is Substrate’s Ethereum compatibility layer. In 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. The issue is patched in commit 146bb48849e5393004be5c88beefe76fdf009aba.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Reference

https://github.com/paritytech/frontier/commit/146bb48849e5393004be5c88beefe76fdf009aba https://github.com/paritytech/frontier/pull/497 https://github.com/paritytech/frontier/security/advisories/GHSA-vj62-g63v-f8mf

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

5.3