CVE-2020-2050

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

Description

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.

Remediation

Solution:

  • This issue is fixed in PAN-OS 8.1.17, PAN-OS 9.0.11, PAN-OS 9.1.5, PAN-OS 10.0.1, and all later PAN-OS versions.

Workaround:

  • This issue can be mitigated by configuring GlobalProtect SSL VPN to require gateway and portal users to authenticate with their credentials. Other authentication methods are not impacted by this issue.

Categories

8.2
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.10%
Vendor Advisory paloaltonetworks.com
Affected: Palo Alto Networks PAN-OS
Published at:
Updated at:

References

Link Tags
https://security.paloaltonetworks.com/CVE-2020-2050 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-2050?
CVE-2020-2050 has been scored as a high severity vulnerability.
How to fix CVE-2020-2050?
To fix CVE-2020-2050: This issue is fixed in PAN-OS 8.1.17, PAN-OS 9.0.11, PAN-OS 9.1.5, PAN-OS 10.0.1, and all later PAN-OS versions.
Is CVE-2020-2050 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-2050 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-2050?
CVE-2020-2050 affects Palo Alto Networks PAN-OS.
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