Bug 1981494 (CVE-2021-3547)

Summary:	CVE-2021-3547 openvpn: possible certificate authentication bypass with --verify-x509-name
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	dazo, huzaifas, klember, steve
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:	2021-07-12 17:14:20 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:	1981495, 1981496
Bug Blocks:

Description Guilherme de Almeida Suckevicz 2021-07-12 16:58:02 UTC

OpenVPN 3 Core Library version 3.6 and 3.6.1 allows a man-in-the-middle attacker to bypass the certificate authentication by issuing an unrelated server certificate using the same hostname found in the verify-x509-name option in a client configuration.

Reference:
https://community.openvpn.net/openvpn/wiki/CVE-2021-3547

Comment 1 Guilherme de Almeida Suckevicz 2021-07-12 16:58:26 UTC

Created openvpn tracking bugs for this issue:

Affects: epel-all [bug 1981496]
Affects: fedora-all [bug 1981495]

Comment 2 David Sommerseth 2021-07-12 17:02:01 UTC

This does NOT affect the 'openvpn' package.  This is an issue which hits the 'openvpn3-linux' project, which currently only has Fedora Copr repos: https://copr.fedorainfracloud.org/coprs/dsommers/openvpn3/

This issue was resolved with v14_beta which was released 2021-07-08.
https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg22622.html