Bug 2035260 (CVE-2021-43809)

Summary:	CVE-2021-43809 rubygem-bundler: unexpected code execution in Gemfiles
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	besser82, caswilli, gtucker, jaruga, jvasik, kaycoth, mo, rblanco, ruby-maint, shreyankg, s, sthirugn, strzibny, vkrizan, vmugicag, vondruch, vsroka
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	rubygem-bundler 2.2.33	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2035261, 2035355, 2214203, 2214204, 2214205
Bug Blocks:	2035262

Description Marian Rehak 2021-12-23 12:27:27 UTC

Crafted directory containing a `Gemfile` file that declares a dependency that is located in a Git repository can lead to Arbitrary Code Execution, which could potentially lead to the takeover of the system. However, the exploitability is very low, because it requires a lot of user interaction.

Upstream Advisory:

https://github.com/rubygems/rubygems/commit/a4f2f8ac17e6ce81c689527a8b6f14381060d95f
https://github.com/rubygems/rubygems/security/advisories/GHSA-fj7f-vq84-fh43

Comment 1 Marian Rehak 2021-12-23 12:27:42 UTC

Created rubygem-bundler tracking bugs for this issue:

Affects: fedora-all [bug 2035261]

Comment 5 Jun Aruga 2022-01-03 12:08:53 UTC

Just for your information. Here is a upstream ticket about this CVE.

Ruby 2.6.9, bundler 1.17.2 and CVE-2021-43809
https://bugs.ruby-lang.org/issues/18431

Comment 6 Vít Ondruch 2022-02-21 11:03:42 UTC

@Marian it seems you have linked wrong commit. The correct reference (also referenced in Bundler changelog [2]) should be [1].



[1]: https://github.com/rubygems/rubygems/pull/5142
[2]: https://github.com/rubygems/rubygems/commit/0fad1ccfe9dd7a3c5b82c1496df3c2b4842870d3

Comment 15 errata-xmlrpc 2025-05-14 02:14:03 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:7539 https://access.redhat.com/errata/RHSA-2025:7539