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CVE-2023-40165

7.4 · HIGH

rubygems.org is the Ruby community's primary gem (library) hosting service.

Published Aug 17, 2023CWE-20EPSS 0.46%

Overview

CVE-2023-40165 is a high-severity vulnerability. It was published on August 17, 2023 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

rubygems.org is the Ruby community's primary gem (library) hosting service. Insufficient input validation allowed malicious actors to replace any uploaded gem version that had a platform, version number, or gem name matching `/-\d/`, permanently replacing the legitimate upload in the canonical gem storage bucket, and triggering an immediate CDN purge so that the malicious gem would be served immediately. The maintainers have checked all gems matching the `/-\d/` pattern and can confirm that no unexpected `.gem`s were found. As a result, we believe this vulnerability was _not_ exploited. The easiest way to ensure that a user's applications were not exploited by this vulnerability is to check that all of your downloaded .gems have a checksum that matches the checksum recorded in the RubyGems.org database. RubyGems contributor Maciej Mensfeld wrote a tool to automatically check that all downloaded .gem files match the checksums recorded in the RubyGems.org database. You can use it by runn

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/rubygems/rubygems.org/commit/7e19c19247ddf5885a915710afc60ec6663d8502GitHubgithub.com/rubygems/rubygems.org/security/advisories/GHSA-rxcq-2m4f-94wmGitHubgithub.com/rubygems/rubygems.org/commit/7e19c19247ddf5885a915710afc60ec6663d8502GitHubgithub.com/rubygems/rubygems.org/security/advisories/GHSA-rxcq-2m4f-94wm

How CyberStrike helps

Frequently asked questions

What is CVE-2023-40165?

CVE-2023-40165 is a high-severity vulnerability. It was published on August 17, 2023 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2023-40165?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-40165?

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-2023-40165?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-40165 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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