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AUSCERT External Security Bulletin Redistribution
PAN-OS: Temporary file race condition vulnerability leads to
local privilege escalation
18 May 2020
AusCERT Security Bulletin Summary
Publisher: Palo Alto
Operating System: Network Appliance
Impact/Access: Root Compromise -- Existing Account
Increased Privileges -- Existing Account
Reduced Security -- Existing Account
CVE Names: CVE-2020-2016
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Palo Alto Networks Security Advisories / CVE-2020-2016
CVE-2020-2016 PAN-OS: Temporary file race condition vulnerability in PAN-OS
leads to local privilege escalation
Severity 7 . HIGH
Attack Vector LOCAL
Attack Complexity HIGH
Privileges Required LOW
User Interaction NONE
Confidentiality Impact HIGH
Integrity Impact HIGH
Availability Impact HIGH
A race condition due to insecure creation of a file in a temporary directory
vulnerability in PAN-OS allows for root privilege escalation from a limited
linux user account.
This allows an attacker who has escaped the restricted shell as a low privilege
administrator, possibly by exploiting another vulnerability, to escalate
privileges to become root user.
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 versions of PAN-OS 8.0.
Versions Affected Unaffected
9.2 >= 9.2.0
9.1 >= 9.1.0
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: 7 (CVSS:3.1/AV:L/AC:H/PR:L/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, PAN-OS
9.1.0, PAN-OS 9.2.0, 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
This issue affects the management interface of PAN-OS and is strongly mitigated
by following best practices for securing the PAN-OS management interface.
Please review the Best Practices for Securing Administrative Access in the
PAN-OS technical documentation, available at: https://docs.paloaltonetworks.com
Palo Alto Networks thanks the UK's National Cyber Security Centre (NCSC) for
discovering and reporting this issue.
Palo Alto Networks thanks the NCC Group for finding this issue independently
during a contracted PAN-OS security assessment.
2020-05-13 Initial publication
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