Bug 1977201 (CVE-2021-22915)

Summary:	CVE-2021-22915 nextcloud: lack of inclusion of IPv6 subnets in rate-limiting considerations allows brute force attacks
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
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:	nextcloud 19.0.11, nextcloud 20.0.10, nextcloud 21.0.2	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-06-29 10:42:12 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:	1977202
Bug Blocks:

Description Marian Rehak 2021-06-29 08:04:02 UTC

Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion of IPv6 subnets in rate-limiting considerations. This could potentially result in an attacker bypassing rate-limit controls such as the Nextcloud brute-force protection.

References:

https://nextcloud.com/security/advisory/?id=NC-SA-2021-009
https://hackerone.com/reports/1154003

Comment 1 Marian Rehak 2021-06-29 08:04:52 UTC

Created nextcloud tracking bugs for this issue:

Affects: fedora-all [bug 1977202]

Comment 2 Product Security DevOps Team 2021-06-29 10:42:12 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.