Bug 2189666 (CVE-2023-28847)

Summary:	CVE-2023-28847 nextcloud: brute forcing password verification
Product:	[Other] Security Response	Reporter:	Chess Hazlett <chazlett>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	Keywords:	Security
Target Milestone:	---
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:	2023-04-26 01:40:39 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2189667, 2189668
Bug Blocks:

Description Chess Hazlett 2023-04-25 20:45:36 UTC

Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform. In Nextcloud Server 24.0.0 prior to 24.0.11 and 25.0.0 prior to 25.0.5; as well as Nextcloud Server Enterprise 23.0.0 prior to 23.0.12.6, 24.0.0 prior to 24.0.11, and 25.0.0 prior to 25.0.5; an attacker is not restricted in verifying passwords of share links so they can just start brute forcing the password. Nextcloud Server 24.0.11 and 25.0.5 and Nextcloud Enterprise Server 23.0.12.6, 24.0.11, and 25.0.5 contain a fix for this issue. No known workarounds are available.

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r5wf-xj97-3w7w
https://hackerone.com/reports/1894653
https://github.com/nextcloud/server/pull/35057

Comment 1 Chess Hazlett 2023-04-25 20:45:54 UTC

Created nextcloud tracking bugs for this issue:

Affects: epel-8 [bug 2189667]
Affects: fedora-all [bug 2189668]

Comment 2 Product Security DevOps Team 2023-04-26 01:40:37 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.