Bug 2063895 (CVE-2021-41241)

Summary:	CVE-2021-41241 nextcloud: groupfolders advanced permissions is not obeyed for subfolders
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ce, james.hogarth
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	nextcloud 20.0.14, nextcloud 21.0.6, nextcloud 22.2.1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-03-14 22:32:03 UTC	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:	2063896
Bug Blocks:

Description Marian Rehak 2022-03-14 15:19:37 UTC

The groupfolders application for Nextcloud allows sharing a folder with a group of people. In addition, it allows setting "advanced permissions" on subfolders, for example, a user could be granted access to the groupfolder but not specific subfolders. Due to a lacking permission check in affected versions, a user could still access these subfolders by copying the groupfolder to another location. Users unable to upgrade should disable the "groupfolders" application in the admin settings.

Reference:

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m4wp-r357-4q94
https://github.com/nextcloud/server/pull/29362
https://github.com/nextcloud/groupfolders/issues/1692

Comment 1 Marian Rehak 2022-03-14 15:19:52 UTC

Created nextcloud tracking bugs for this issue:

Affects: fedora-all [bug 2063896]

Comment 2 Product Security DevOps Team 2022-03-14 22:32:01 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.