CVE-2022-0023: PAN-OS: Denial-of-Service (DoS) Vulnerability in DNS Proxy
First published: Wed Apr 13 2022(Updated: )
An improper handling of exceptional conditions vulnerability exists in the DNS proxy feature of Palo Alto Networks PAN-OS software that enables a meddler-in-the-middle (MITM) to send specifically crafted traffic to the firewall that causes the service to restart unexpectedly. Repeated attempts to send this request result in denial-of-service to all PAN-OS services by restarting the device in maintenance mode. This issue does not impact Panorama appliances and Prisma Access customers. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.22; PAN-OS 9.0 versions earlier than PAN-OS 9.0.16; PAN-OS 9.1 versions earlier than PAN-OS 9.1.13; PAN-OS 10.0 versions earlier than PAN-OS 10.0.10; PAN-OS 10.1 versions earlier than PAN-OS 10.1.5. This issue does not impact PAN-OS 10.2.
Credit: psirt@paloaltonetworks.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Paloaltonetworks Pan-os | >=8.1.0<8.1.22 | |
| Paloaltonetworks Pan-os | >=9.0.0<9.0.16 | |
| Paloaltonetworks Pan-os | >=9.1.0<9.1.13 | |
| Paloaltonetworks Pan-os | >=10.0.0<10.0.10 | |
| Paloaltonetworks Pan-os | >=10.1.0<10.1.5 |
Remedy
This issue is fixed in PAN-OS 8.1.22, PAN-OS 9.0.16, PAN-OS 9.1.13, PAN-OS 10.0.10, PAN-OS 10.1.5, and all later PAN-OS versions.
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Reference Links
Frequently Asked Questions
What is CVE-2022-0023?
CVE-2022-0023 is an improper handling of exceptional conditions vulnerability in the DNS proxy feature of Palo Alto Networks PAN-OS software.
How does CVE-2022-0023 affect Palo Alto Networks PAN-OS?
CVE-2022-0023 affects Palo Alto Networks PAN-OS versions 8.1.0 to 8.1.22, 9.0.0 to 9.0.16, 9.1.0 to 9.1.13, 10.0.0 to 10.0.10, and 10.1.0 to 10.1.5.
What is the severity of CVE-2022-0023?
CVE-2022-0023 has a severity rating of medium with a CVSS score of 5.9.
How can an attacker exploit CVE-2022-0023?
An attacker can exploit CVE-2022-0023 by sending specifically crafted traffic to the firewall's DNS proxy feature, causing it to restart unexpectedly.
Is there a fix for CVE-2022-0023?
Yes, Palo Alto Networks has released patches to address the vulnerability. It is recommended to update to the latest version of PAN-OS.
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