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AUSCERT External Security Bulletin Redistribution
PAN-OS: Improper SAML SSO authorization of shared local users
14 May 2020
AusCERT Security Bulletin Summary
Product: PAN OS
Publisher: Palo Alto
Operating System: Network Appliance
Impact/Access: Unauthorised Access -- Existing Account
CVE Names: CVE-2020-1998
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Palo Alto Networks Security Advisories / CVE-2020-1998
CVE-2020-1998 PAN-OS: Improper SAML SSO authorization of shared local users
Severity 5.4 . MEDIUM
Attack Vector NETWORK
Attack Complexity LOW
Privileges Required LOW
User Interaction NONE
Confidentiality Impact LOW
Integrity Impact LOW
Availability Impact NONE
An improper authorization vulnerability in PAN-OS that mistakenly uses the
permissions of local linux users instead of the intended SAML permissions of
the account when the username is shared for the purposes of SSO authentication.
This can result in authentication bypass and unintended resource access for the
This issue affects:
PAN-OS 7.1 versions earlier than 7.1.26;
All versions 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;
PAN-OS 9.1 versions earlier than 9.1.1.
Versions Affected Unaffected
9.1 < 9.1.1 >= 9.1.1
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: 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)
This issue is fixed in PAN-OS 7.1.26, PAN-OS 8.1.13, PAN-OS 9.0.6, PAN-OS
9.1.1, 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
The impact of this vulnerability can be mitigated by removing shared usernames
between local linux users and SAML enabled users.
Palo Alto Networks would like to thank Maurice Lok-Hin 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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