title: PAN-OS: Spoofed Kerberos key distribution center authentication bypass
description: An authentication bypass by spoofing vulnerability exists in the authentication daemon and User-ID components of Palo Alto Networks PAN-OS by failing to verify the integrity of the Kerberos key distribution center (KDC) before authenticating users. This affects all forms of authentication that use a Kerberos authentication profile. A man-in-the-middle type of attacker with the ability to intercept communication between PAN-OS and KDC can login to PAN-OS as an administrator. This issue affects: PAN-OS 7.1 versions earlier than 7.1.26; PAN-OS 8.1 versions earlier than 8.1.13; PAN-OS 9.0 versions earlier than 9.0.6; All version of PAN-OS 8.0.
problem types: CWE-290 Authentication Bypass by Spoofing
affected:
{
product: PAN-OS
vendor: Palo Alto Networks
versions:
status: affected, version: 8.0.*
changes: [at: 8.1.13, status: unaffected], lessThan: 8.1.13, status: affected, version: 8.1, versionType: custom
changes: [at: 9.0.6, status: unaffected], lessThan: 9.0.6, status: affected, version: 9.0, versionType: custom
changes: [at: 7.1.26, status: unaffected], lessThan: 7.1.26, status: affected, version: 7.1, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 8.1
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]
solutions: This issue is fixed in PAN-OS 7.1.26, PAN-OS 8.1.13, PAN-OS 9.0.6, and all later PAN-OS versions.
PAN-OS 8.0 is now end-of-life as of October 31, 2019, and is no longer covered by our Product Security Assurance policies.
workarounds: Ensure that PAN-OS communicates to Kerberos server over a secured network with access restricted to trusted users.
Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation, available at: https://docs.paloaltonetworks.com.