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AUSCERT External Security Bulletin Redistribution
ESB-2020.2352
CVE-2020-2031 PAN-OS: Integer underflow in the management interface
9 July 2020
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AusCERT Security Bulletin Summary
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Product: PAN-OS management interface
Publisher: Palo Alto
Operating System: Network Appliance
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-2031
Original Bulletin:
https://securityadvisories.paloaltonetworks.com/CVE-2020-2031
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Palo Alto Networks Security Advisories / CVE-2020-2031
CVE-2020-2031 PAN-OS: Integer underflow in the management interface
047910
Severity 4.9 . MEDIUM
Attack Vector NETWORK
Attack Complexity LOW
Privileges Required HIGH
User Interaction NONE
Scope UNCHANGED
Confidentiality Impact NONE
Integrity Impact NONE
Availability Impact HIGH
NVD JSON
Published 2020-07-08
Updated 2020-07-08
Reference PAN-100000
Discovered internally
Description
An integer underflow vulnerability in the dnsproxyd component of the PAN-OS
management interface allows authenticated administrators to issue a command
from the command line interface that causes the component to stop responding.
Repeated attempts to send this request result in denial of service to all
PAN-OS services by restarting the device and putting it into maintenance mode.
This issue impacts:
PAN-OS 9.1 versions earlier than PAN-OS 9.1.3.
This issue does not impact PAN-OS 8.1, PAN-OS 9.0, or Prisma Access services.
Product Status
PAN-OS
Versions Affected Unaffected
9.1 = 9.1.3
9.0 9.0.*
8.1 8.1.*
Severity: MEDIUM
CVSSv3.1 Base Score: 4.9 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)
Weakness Type
CWE-191 Integer Underflow (Wrap or Wraparound)
Solution
This issue is fixed in PAN-OS 9.1.3 and all later PAN-OS versions.
Workarounds and Mitigations
This issue impacts the PAN-OS management interface but you can mitigate the
impact of this issue 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/best-practices.
Acknowledgments
This issue was discovered by Jin Chen of Palo Alto Networks during internal
security review.
Timeline
2020-07-08 Initial publication
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