CVE-2021-41241
Advanced permissions is not respected for subfolders in Nextcloud server
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.
INFO
Published Date :
March 8, 2022, 7:15 p.m.
Last Modified :
Nov. 21, 2024, 6:25 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Upgrade Nextcloud Server to version 20.0.14, 21.0.6, or 22.2.1.
- If unable to upgrade, disable the "groupfolders" application in the admin settings.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-41241.
| URL | Resource |
|---|---|
| https://github.com/nextcloud/groupfolders/issues/1692 | Issue Tracking Patch Third Party Advisory |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m4wp-r357-4q94 | Issue Tracking Third Party Advisory |
| https://github.com/nextcloud/server/pull/29362 | Patch Third Party Advisory |
| https://security.gentoo.org/glsa/202208-17 | Third Party Advisory |
| https://github.com/nextcloud/groupfolders/issues/1692 | Issue Tracking Patch Third Party Advisory |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m4wp-r357-4q94 | Issue Tracking Third Party Advisory |
| https://github.com/nextcloud/server/pull/29362 | Patch Third Party Advisory |
| https://security.gentoo.org/glsa/202208-17 | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-41241 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-41241
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-41241 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-41241 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/nextcloud/groupfolders/issues/1692 Added Reference https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m4wp-r357-4q94 Added Reference https://github.com/nextcloud/server/pull/29362 Added Reference https://security.gentoo.org/glsa/202208-17 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Oct. 25, 2022
Action Type Old Value New Value Changed Reference Type https://security.gentoo.org/glsa/202208-17 No Types Assigned https://security.gentoo.org/glsa/202208-17 Third Party Advisory -
CVE Modified by [email protected]
Aug. 11, 2022
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/202208-17 [No Types Assigned] -
Reanalysis by [email protected]
Aug. 09, 2022
Action Type Old Value New Value Added CWE NIST CWE-862 -
Initial Analysis by [email protected]
Mar. 14, 2022
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Changed Reference Type https://github.com/nextcloud/groupfolders/issues/1692 No Types Assigned https://github.com/nextcloud/groupfolders/issues/1692 Issue Tracking, Patch, Third Party Advisory Changed Reference Type https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m4wp-r357-4q94 No Types Assigned https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m4wp-r357-4q94 Issue Tracking, Third Party Advisory Changed Reference Type https://github.com/nextcloud/server/pull/29362 No Types Assigned https://github.com/nextcloud/server/pull/29362 Patch, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* versions up to (excluding) 20.0.14 *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* versions from (including) 21.0.0 up to (excluding) 21.0.6 *cpe:2.3:a:nextcloud:nextcloud_server:22.2.0:*:*:*:*:*:*:*
Vulnerability Scoring Details
Base CVSS Score: 4.3
Base CVSS Score: 4
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.28 }} 0.01%
score
0.50897
percentile