CVE-2021-41241 Advanced permissions is not respected for subfolders in Nextcloud server

2022-03-0818:25:10

CWE-863

GitHub_M

www.cve.org

4.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

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

5.4 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

33.2%

JSON

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.

CNA Affected

[
  {
    "product": "security-advisories",
    "vendor": "nextcloud",
    "versions": [
      {
        "status": "affected",
        "version": "< 20.0.14"
      },
      {
        "status": "affected",
        "version": ">= 21.0.0, < 21.0.6"
      },
      {
        "status": "affected",
        "version": ">= 22.2.0, < 22.2.1"
      }
    ]
  }
]