Medium severity · published Mar 8, 2022
CVE-2021-41241
Nextcloud server is a self hosted system designed to provide cloud style services
4.3
CVSS
0.8%
EPSS
No
On KEV
Description
Nextcloud server is a self hosted system designed to provide cloud style services. 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. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. Users unable to upgrade should disable the "groupfolders" application in the admin settings.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
before 20.0.14; 21.0.0 before 21.0.6; 22.2.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-41241
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-41241
Issue Tracking
https://github.com/nextcloud/groupfolders/issues/1692
Issue Tracking
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m4wp-r357-4q94
Patch
https://github.com/nextcloud/server/pull/29362
Third Party Advisory
https://security.gentoo.org/glsa/202208-17
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