Bug 2018288 (CVE-2021-41179) - CVE-2021-41179 nextcloud: two-factor authentication not enforced for pages marked as public
Summary: CVE-2021-41179 nextcloud: two-factor authentication not enforced for pages ma...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-41179
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2018289
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-10-28 17:57 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-10-28 20:07 UTC (History)
2 users (show)

Fixed In Version:
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Last Closed: 2021-10-28 20:07:58 UTC
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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.
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