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AUSCERT External Security Bulletin Redistribution
Spoofed Kerberos key distribution center authentication bypass
14 May 2020
AusCERT Security Bulletin Summary
Publisher: Palo Alto
Operating System: Network Appliance
Impact/Access: Root Compromise -- Remote/Unauthenticated
CVE Names: CVE-2020-2002
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Palo Alto Networks Security Advisories / CVE-2020-2002
CVE-2020-2002 PAN-OS: Spoofed Kerberos key distribution center authentication
Severity 8.1 . HIGH
Attack Vector NETWORK
Attack Complexity HIGH
Privileges Required NONE
User Interaction NONE
Confidentiality Impact HIGH
Integrity Impact HIGH
Availability Impact HIGH
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;
All version of PAN-OS 8.0;
PAN-OS 8.1 versions earlier than 8.1.13;
PAN-OS 9.0 versions earlier than 9.0.6.
Versions Affected Unaffected
9.0 < 9.0.6 >= 9.0.6
8.1 < 8.1.13 >= 8.1.13
7.1 < 7.1.26 >= 7.1.26
CVSSv3.1 Base Score: 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
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 and Mitigations
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
Palo Alto Networks would like to thank Yoav Iellin, Yaron Kassner, and Rotem
Zach from Silverfort for discovering and reporting this issue.
2020-05-13 Initial publication
Policy Report vulnerabilitiesManage subscriptions
(C) 2020 Palo Alto Networks, Inc. All rights reserved.
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