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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (6.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 6.31% probability · 93th percentile
- CISA KEV
- Not listed
- Affected
- bundler/bundler · fedoraproject/fedora · microsoft/package manager configurations
- Source
- cve@mitre.org
References
- https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.htmlVendor Advisory
- https://github.com/rubygems/rubygems/issues/3982Exploit, Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/
- https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/Third Party Advisory
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105Patch, Vendor Advisory
- https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/Exploit, Third Party Advisory
- https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.htmlVendor Advisory
- https://github.com/rubygems/rubygems/issues/3982Exploit, Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/
- https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/Third Party Advisory
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105Patch, Vendor Advisory
- https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.