CVE-2021-41179 Information

Description

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.

CVSS Vector

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

Reference

https://github.com/nextcloud/server/pull/28725 https://hackerone.com/reports/1322865 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7hvh-rc6f-px23

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5