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AUSCERT External Security Bulletin Redistribution
ESB-2020.1719
Spoofed Kerberos key distribution center authentication bypass
14 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: PAN-OS
Publisher: Palo Alto
Operating System: Network Appliance
Impact/Access: Root Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-2002
Original Bulletin:
https://securityadvisories.paloaltonetworks.com/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
bypass
047910
Severity 8.1 . HIGH
Attack Vector NETWORK
Attack Complexity HIGH
Privileges Required NONE
User Interaction NONE
Scope UNCHANGED
Confidentiality Impact HIGH
Integrity Impact HIGH
Availability Impact HIGH
NVD JSON
Published: 2020-05-13
Updated: 2020-05-13
Ref#: PAN-118957
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;
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.
Product Status
PAN-OS
Versions Affected Unaffected
9.0 < 9.0.6 >= 9.0.6
8.1 < 8.1.13 >= 8.1.13
8.0 8.0.*
7.1 < 7.1.26 >= 7.1.26
Severity: HIGH
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)
Solution
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
.
Acknowledgements
Palo Alto Networks would like to thank Yoav Iellin, Yaron Kassner, and Rotem
Zach from Silverfort for discovering and reporting this issue.
Timeline
2020-05-13 Initial publication
Terms of usePrivacyProduct Security Assurance and Vulnerability Disclosure
Policy Report vulnerabilitiesManage subscriptions
(C) 2020 Palo Alto Networks, Inc. All rights reserved.
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