CVE-2020-36327

high-risk
Published 2021-04-29

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.

Do I need to act?

!
24.7% chance of exploitation in next 30 days
EPSS score — higher than 75% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (3)

Bundler

Affected Vendors

Microsoft Fedoraproject Bundler

References (12)

Vendor Advisory https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-pri...
Exploit https://github.com/rubygems/rubygems/issues/3982
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Third Party Advisory https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/
Patch https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105
Exploit https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confu...
Vendor Advisory https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-pri...
Exploit https://github.com/rubygems/rubygems/issues/3982
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Third Party Advisory https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/
Patch https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105
Exploit https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confu...
54
/ 100
high-risk
Severity 30/34 · Critical
Exploitability 15/34 · Moderate
Exposure 9/34 · Low