CVE-2021-41179 Two-Factor Authentication not enforced for pages marked as public

2021-10-2522:00:13

CWE-304

GitHub_M

www.cve.org

cve-2021-41179; two-factor authentication; nextcloud; publicpage; nextcloud talk; security update; upgrade required

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

7.6

Confidence

High

EPSS

0.001

Percentile

43.0%

JSON

Nextcloud is an open-source, self-hosted productivity platform. Prior to Nextcloud Server versions 20.0.13, 21.0.5, and 22.2.0, the Two-Factor Authentication wasn’t enforced for pages marked as public. Any page marked as @PublicPage could thus be accessed with a valid user session that isn’t authenticated. This particularly affects the Nextcloud Talk application, as this could be leveraged to gain access to any private chat channel without going through the Two-Factor flow. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.

CNA Affected

[
  {
    "product": "security-advisories",
    "vendor": "nextcloud",
    "versions": [
      {
        "status": "affected",
        "version": "< 20.0.13"
      },
      {
        "status": "affected",
        "version": ">= 21.0.0, < 21.0.5"
      },
      {
        "status": "affected",
        "version": "< 22.2.0"
      }
    ]
  }
]