Detections
Analytics

Palo Alto Networks PAN-OS 8.1.x < 8.1.17 / 9.0.x < 9.0.11 / 9.1.x < 9.1.5 / 10.0.x < 10.0.1 Authentication Bypass Vulnerability

high Nessus Plugin ID 142875

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Synopsis

The remote PAN-OS host is affected by an authentication bypass vulnerability

Description

The version of Palo Alto Networks PAN-OS running on the remote host is 8.1.x prior to 8.1.17 or 9.0.x prior to 9.0.11 or 9.1.x prior to 9.1.5 or 10.0.x prior to 10.0.1. It is, therefore, affected by a vulnerability.

 - 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. (CVE-2020-2050)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to PAN-OS 8.1.17 / 9.0.11 / 9.1.5 / 10.0.1 or later

See Also

https://security.paloaltonetworks.com/CVE-2020-2050

https://cwe.mitre.org/data/definitions/285.html

Plugin Details

Severity: High

ID: 142875

File Name: palo_alto_CVE-2020-2050.nasl

Version: 1.5

Type: combined

Published: 11/13/2020

Updated: 2/19/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.2

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2020-2050

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:paloaltonetworks:pan-os

Required KB Items: Host/Palo_Alto/Firewall/Version, Host/Palo_Alto/Firewall/Full_Version, Host/Palo_Alto/Firewall/Source

Exploit Ease: No known exploits are available

Patch Publication Date: 11/11/2020

Vulnerability Publication Date: 11/11/2020

Reference Information

CVE: CVE-2020-2050

CWE: 285

IAVA: 2020-A-0522-S