CVE-2021-41241

Advanced permissions is not respected for subfolders in Nextcloud server

CVSS 4.3 MEDIUMEPSS 0.8%CWE-863

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.3EPSS 0.8%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

08 Mar 2022Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

nextcloud · security-advisories

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References

https://github.com/nextcloud/groupfolders/issues/1692 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m4wp-r357-4q94 https://github.com/nextcloud/server/pull/29362 https://security.gentoo.org/glsa/202208-17