Vulnerability Details : 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.

Published 2021-04-29 03:15:09

Updated 2022-04-05 18:06:12

Source MITRE

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2020-36327

Probability of exploitation activity in the next 30 days: 0.84%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 80 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2020-36327

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
9.3	HIGH	AV:N/AC:M/Au:N/C:C/I:C/A:C	8.6	10.0	nvd@nist.gov
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete
8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	2.8	5.9	nvd@nist.gov
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: High Availability: High

References for CVE-2020-36327

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/

Mailing List;Third Party Advisory

CVEs referencing this url
https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html

Bundler: A more secure bundler: We fixed our source priorities.
Vendor Advisory
https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/

RubyGems dependency confusion attack side of things - Closer to Code
Third Party Advisory
https://github.com/rubygems/rubygems/issues/3982

Global vs block gem server source priority doesn't work as expected · Issue #3982 · rubygems/rubygems · GitHub
Exploit;Issue Tracking;Third Party Advisory
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105

CVE-2021-24105 - Security Update Guide - Microsoft - Package Managers Configurations Remote Code Execution Vulnerability
Patch;Vendor Advisory
https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/

Bundler is Still Vulnerable to Dependency Confusion Attacks (CVE⁠-⁠2020⁠-⁠36327) | zofrex.com
Exploit;Third Party Advisory

Products affected by CVE-2020-36327

Microsoft » Package Manager Configurations » Version: N/A
cpe:2.3:a:microsoft:package_manager_configurations:-:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Matching versions
Bundler » Bundler » For Ruby
Versions from including (>=) 2.2.11 and up to, including, (<=) 2.2.16
cpe:2.3:a:bundler:bundler:*:*:*:*:*:ruby:*:*
Matching versions
Bundler » Bundler » For Ruby
Versions from including (>=) 1.16.0 and before (<) 2.2.10
cpe:2.3:a:bundler:bundler:*:*:*:*:*:ruby:*:*
Matching versions