Bug 1988993 (CVE-2021-32726)

Summary:	CVE-2021-32726 nextcloud: server security bypass
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	ce, james.hogarth
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-08-02 13:07:03 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1988994
Bug Blocks:

Description Dhananjay Arunesh 2021-08-02 08:50:15 UTC

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.

References:
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg

Comment 1 Dhananjay Arunesh 2021-08-02 08:58:17 UTC

Created nextcloud tracking bugs for this issue:

Affects: fedora-all [bug 1988994]

Comment 2 Product Security DevOps Team 2021-08-02 13:07:03 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.