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CVE-2021-41138

5.3 · MEDIUM

Frontier is Substrate's Ethereum compatibility layer.

Published Oct 13, 2021CWE-20EPSS 1.38%

Overview

CVE-2021-41138 is a medium-severity vulnerability. It was published on October 13, 2021 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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`.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/paritytech/frontier/commit/146bb48849e5393004be5c88beefe76fdf009abaGitHubgithub.com/paritytech/frontier/pull/497GitHubgithub.com/paritytech/frontier/security/advisories/GHSA-vj62-g63v-f8mfGitHubgithub.com/paritytech/frontier/commit/146bb48849e5393004be5c88beefe76fdf009abaGitHubgithub.com/paritytech/frontier/pull/497GitHubgithub.com/paritytech/frontier/security/advisories/GHSA-vj62-g63v-f8mf

How CyberStrike helps

Frequently asked questions

What is CVE-2021-41138?

CVE-2021-41138 is a medium-severity vulnerability. It was published on October 13, 2021 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2021-41138?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-41138?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-41138?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-41138 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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