CVE-2022-0547

Ubuntu Security Notice USN-6850-1

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more than one of them makes use of deferred authentication replies, which allows an external user to be granted access with only partially correct credentials.

OpenVPN versiones 2.1 hasta v2.4.12 y versión v2.5.6, puede permitir una omisión de autenticación en los complementos de autenticación externa cuando más de uno de ellos hace uso de las respuestas de autenticación diferida, lo que permite que sea concedido acceso a un usuario externo con credenciales sólo parcialmente correctas

It was discovered that OpenVPN incorrectly handled certain configurations with multiple authentication plugins. A remote attacker could possibly use this issue to bypass authentication using incomplete credentials.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2022-02-08 CVE Reserved
2022-03-18 CVE Published
2025-04-23 CVE Updated
2025-06-16 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-287: Improper Authentication
CWE-305: Authentication Bypass by Primary Weakness

CAPEC

References (6)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html	Mailing List

URL	Date	SRC

URL	Date	SRC
https://openvpn.net/community-downloads	2023-11-07

URL	Date	SRC
https://community.openvpn.net/openvpn/wiki/CVE-2022-0547	2023-11-07
https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GFXJ35WKPME4HYNQCQNAJHLCZOJL2SAE	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R36OYC5SJ6FLPVAYJYYT4MOJ2I7MGYFF	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Openvpn Search vendor "Openvpn"		Openvpn Search vendor "Openvpn" for product "Openvpn"				>= 2.1.0 < 2.4.12 Search vendor "Openvpn" for product "Openvpn" and version " >= 2.1.0 < 2.4.12"		-		Affected
Openvpn Search vendor "Openvpn"		Openvpn Search vendor "Openvpn" for product "Openvpn"				>= 2.5.0 < 2.5.6 Search vendor "Openvpn" for product "Openvpn" and version " >= 2.5.0 < 2.5.6"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				36 Search vendor "Fedoraproject" for product "Fedora" and version "36"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected