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CVE-2023-40012

5.9 · MEDIUM

uthenticode is a small cross-platform library for partially verifying Authenticode digital signatures.

Published Aug 9, 2023CWE-325EPSS 0.25%

Overview

CVE-2023-40012 is a medium-severity vulnerability. It was published on August 9, 2023 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

uthenticode is a small cross-platform library for partially verifying Authenticode digital signatures. Versions of uthenticode prior to the 2.x series did not check Extended Key Usages in certificates, in violation of the Authenticode X.509 certificate profile. As a result, a malicious user could produce a "signed" PE file that uthenticode would verify and consider valid using an X.509 certificate that isn't entitled to produce code signatures (e.g., a SSL certificate). By design, uthenticode does not perform full-chain validation. However, the absence of EKU validation was an unintended oversight. The 2.0.0 release series includes EKU checks. There are no workarounds to this vulnerability.

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/trailofbits/uthenticode/commit/caeb1eb62412605f71bd96ce9bb9420644b6db53GitHubgithub.com/trailofbits/uthenticode/pull/78GitHubgithub.com/trailofbits/uthenticode/security/advisories/GHSA-gm2f-j4rj-6xqjGitHubgithub.com/trailofbits/uthenticode/commit/caeb1eb62412605f71bd96ce9bb9420644b6db53GitHubgithub.com/trailofbits/uthenticode/pull/78GitHubgithub.com/trailofbits/uthenticode/security/advisories/GHSA-gm2f-j4rj-6xqj

How CyberStrike helps

Frequently asked questions

What is CVE-2023-40012?

CVE-2023-40012 is a medium-severity vulnerability. It was published on August 9, 2023 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2023-40012?

This vulnerability has a CVSS 3.1 base score of 5.9, 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-2023-40012?

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-2023-40012?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-40012 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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