Vulnerability Monitor

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CVE-2020-36327

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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 8.8, indicating it can be exploited remotely over the network with relatively low complexity though user interaction is required and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 3 products from bundler, from fedoraproject, from microsoft organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-04-29T03:15:08.710

Last Modified

2024-11-21T05:29:17.540

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 8.8 (HIGH)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:C/I:C/A:C

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

8.6

Impact Score

10.0

Weaknesses

Type: Primary
NVD-CWE-noinfo

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	bundler	bundler	< 2.2.10	Yes
Application	bundler	bundler	≤ 2.2.16	Yes
Operating System	fedoraproject	fedora	34	Yes
Application	microsoft	package_manager_configurations	-	Yes

References

https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html Vendor Advisory ([email protected])
https://github.com/rubygems/rubygems/issues/3982 Exploit, Issue Tracking, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/ ([email protected])
https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/ Third Party Advisory ([email protected])
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105 Patch, Vendor Advisory ([email protected])
https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/ Exploit, Third Party Advisory ([email protected])
https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/rubygems/rubygems/issues/3982 Exploit, Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/ (af854a3a-2127-422b-91ae-364da2661108)
https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105 Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/ Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For bundler's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.