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Security Advisories: GSA_kwCzR0hTQS12ajYyLWc2M3YtZjhtZs0Wig

Validity check missing in Frontier


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.


Patch PR:

For more information

If you have any questions or comments about this advisory:

Special thanks

Special thanks to @librelois, @nanocryk and the Moonbeam team for reporting and fixing this security vulnerability.

Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 2 years ago
Updated: about 1 year ago

CVSS Score: 5.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Identifiers: GHSA-vj62-g63v-f8mf, CVE-2021-41138
References: Repository:
Blast Radius: 1.0

Affected Packages

Dependent packages: 0
Dependent repositories: 0
Downloads: 629 total
Affected Version Ranges: <= 0.1.0
No known fixed version
All affected versions: 0.0.0, 0.0.1, 0.0.2, 0.0.3, 0.1.0