CVE-2020-2050

PAN-OS: Authentication bypass vulnerability in GlobalProtect SSL VPN client certificate verification

Severity Score

8.2

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An authentication bypass vulnerability exists in the GlobalProtect SSL VPN component of Palo Alto Networks PAN-OS software that allows an attacker to bypass all client certificate checks with an invalid certificate. A remote attacker can successfully authenticate as any user and gain access to restricted VPN network resources when the gateway or portal is configured to rely entirely on certificate-based authentication. Impacted features that use SSL VPN with client certificate verification are: GlobalProtect Gateway, GlobalProtect Portal, GlobalProtect Clientless VPN In configurations where client certificate verification is used in conjunction with other authentication methods, the protections added by the certificate check are ignored as a result of this issue. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.17; PAN-OS 9.0 versions earlier than PAN-OS 9.0.11; PAN-OS 9.1 versions earlier than PAN-OS 9.1.5; PAN-OS 10.0 versions earlier than PAN-OS 10.0.1.

Se presenta una vulnerabilidad de omisión de autenticación en el componente GlobalProtect SSL VPN del software PAN-OS de Palo Alto Networks, que permite a un atacante omitir todas las comprobaciones de certificados de clientes con un certificado no válido. Un atacante remoto puede autenticarse con éxito como cualquier usuario y conseguir acceso a los recursos de red VPN restringidos cuando la puerta de enlace o el portal están configurados para depender completamente de la autenticación basada en certificados. Las características afectadas que usan SSL VPN con verificación de certificado de cliente son: GlobalProtect Gateway, GlobalProtect Portal, GlobalProtect Clientless VPN. En configuraciones donde la verificación de certificado de cliente es usada en conjunto con otros métodos de autenticación, las protecciones agregadas por la verificación de certificado son ignoradas como resultado de este problema. Este problema afecta: versiones PAN-OS 8.1 anteriores a PAN-OS 8.1.17; versiones PAN-OS 9.0 anteriores a PAN-OS 9.0.11; versiones PAN-OS 9.1 anteriores a PAN-OS 9.1.5; versiones PAN-OS 10.0 anteriores a PAN-OS 10.0.1

*Credits: This issue was found by Nicholas Newsom of Palo Alto Networks during internal security review.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-12-04 CVE Reserved
2020-11-12 CVE Published
2024-07-29 EPSS Updated
2024-09-17 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-285: Improper Authorization
CWE-287: Improper Authentication

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://security.paloaltonetworks.com/CVE-2020-2050	2020-11-24

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Paloaltonetworks Search vendor "Paloaltonetworks"		Pan-os Search vendor "Paloaltonetworks" for product "Pan-os"				>= 8.1.0 < 8.1.17 Search vendor "Paloaltonetworks" for product "Pan-os" and version " >= 8.1.0 < 8.1.17"		-		Affected
Paloaltonetworks Search vendor "Paloaltonetworks"		Pan-os Search vendor "Paloaltonetworks" for product "Pan-os"				>= 9.0.0 < 9.0.11 Search vendor "Paloaltonetworks" for product "Pan-os" and version " >= 9.0.0 < 9.0.11"		-		Affected
Paloaltonetworks Search vendor "Paloaltonetworks"		Pan-os Search vendor "Paloaltonetworks" for product "Pan-os"				>= 9.1.0 < 9.1.5 Search vendor "Paloaltonetworks" for product "Pan-os" and version " >= 9.1.0 < 9.1.5"		-		Affected
Paloaltonetworks Search vendor "Paloaltonetworks"		Pan-os Search vendor "Paloaltonetworks" for product "Pan-os"				>= 10.0.0 < 10.0.1 Search vendor "Paloaltonetworks" for product "Pan-os" and version " >= 10.0.0 < 10.0.1"		-		Affected