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

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.

Affected products

Vendor	Product	Affected	Fixed
nextcloud	security-advisories	< 20.0.13, >= 21.0.0, < 21.0.5, < 22.2.0	—

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

SUSE

Security tracker ↗

Release	Package	Fixed in	Advisory
SUSE Package Hub 15 SP3	nextcloud	20.0.14-bp153.2.9.1	openSUSE-SU-2021:1602-1
SUSE Package Hub 15 SP2	nextcloud	20.0.14-bp153.2.9.1	openSUSE-SU-2021:1602-1
SUSE Package Hub 15 SP1	nextcloud	20.0.14-bp153.2.9.1	openSUSE-SU-2021:1602-1

Show 1 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
SUSE Package Hub 12	nextcloud	20.0.14-bp153.2.9.1	openSUSE-SU-2021:1602-1

openSUSE