Bug 2018288 (CVE-2021-41179)

Summary:	CVE-2021-41179 nextcloud: two-factor authentication not enforced for pages marked as public
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ce, james.hogarth
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Last Closed:	2021-10-28 20:07:58 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Bug Depends On:	2018289
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Description Guilherme de Almeida Suckevicz 2021-10-28 17:57:48 UTC

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.

Reference:
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7hvh-rc6f-px23

Comment 1 Guilherme de Almeida Suckevicz 2021-10-28 17:58:02 UTC

Created nextcloud tracking bugs for this issue:

Affects: fedora-all [bug 2018289]

Comment 2 Product Security DevOps Team 2021-10-28 20:07:58 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.