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CVE-2020-36327

8.8 · HIGH

Bundler 1.16.0 through 2.2.9 and 2.2.11 through 2.2.16 sometimes chooses a dependency source based on the highest gem version number, which means that a rogue gem found at a public source may be ch…

Published Apr 29, 2021EPSS 6.31%

Overview

CVE-2020-36327 is a high-severity vulnerability. It was published on April 29, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Bundler 1.16.0 through 2.2.9 and 2.2.11 through 2.2.16 sometimes chooses a dependency source based on the highest gem version number, which means that a rogue gem found at a public source may be chosen, even if the intended choice was a private gem that is a dependency of another private gem that is explicitly depended on by the application. NOTE: it is not correct to use CVE-2021-24105 for every "Dependency Confusion" issue in every product.

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

Refbundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.htmlGitHubgithub.com/rubygems/rubygems/issues/3982Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/Refmensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/Refmsrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105Refwww.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/Refbundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.htmlGitHubgithub.com/rubygems/rubygems/issues/3982Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/Refmensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-36327?

CVE-2020-36327 is a high-severity vulnerability. It was published on April 29, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2020-36327?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2020-36327?

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-2020-36327?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-36327 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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