Bug 1185842 – VUL-0: CVE-2020-36327: rubygem-bundler: Bundler 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

Bug 1185842 - (CVE-2020-36327) VUL-0: CVE-2020-36327: rubygem-bundler: Bundler 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

(CVE-2020-36327)
Summary:	VUL-0: CVE-2020-36327: rubygem-bundler: Bundler chooses a dependency source b...

Status:	NEW

Classification:	Novell Products
Product:	SUSE Security Incidents
Classification:	Novell Products
Component:	Incidents
Version:	unspecified
Hardware:	Other Other

Priority:	P2 - High Severity: Major
Target Milestone:	---
Assigned To:	Marcus Rückert
QA Contact:	Security Team bot

URL:	https://smash.suse.de/issue/283259/
Whiteboard:	CVSSv3.1:SUSE:CVE-2020-36327:8.8:(AV:...
Keywords:

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Reported:	2021-05-10 10:50 UTC by Gianluca Gabrielli
Modified:	2022-11-11 09:02 UTC (History)
CC List:	10 users (show)

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Found By:	Security Response Team
Services Priority:
Business Priority:
Blocker:	---
Marketing QA Status:	---
IT Deployment:	---

Flags:	gabriele.sonnu: needinfo? (mrueckert)

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Description Gianluca Gabrielli 2021-05-10 10:50:31 UTC

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.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-36327
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36327
https://github.com/rubygems/rubygems/issues/3982
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105

Comment 1 Gianluca Gabrielli 2021-05-10 10:56:13 UTC

This is the PR [0] where this behavior is fixed, via this patch [1]. Anyway, the PR has been successively reverted by the author with this commit [2].

Let's take this ticket open to track the issue, while wait for upstream to release a proper patch.

[0] https://github.com/rubygems/rubygems/pull/3655
[1] https://github.com/rubygems/rubygems/commit/4346a8bb5d58c5026ad48f18e9da3dcee8c7b198.patch
[2] https://github.com/rubygems/rubygems/commit/8284816a94a8cbd7e7b6cf694b924289e040196a.patch

Comment 2 Gianluca Gabrielli 2021-05-10 10:58:25 UTC

Affected packages:

- SUSE:SLE-15:Update/rubygem-bundler 1.16.1
- openSUSE:Factory/rubygem-bundler   2.2.6