Palo Alto Networks PAN-OS Reflected Amplification Denial-of-Service Vulnerability (CVE-2022-0028)

A remote attacker, without authentication, can achieve partial data exposure, complete denial of service or system unavailability. Federal agencies are required to remediate by 2022-09-12 under CISA BOD 22-01.

This is a Software Vulnerability (CWE-406) (CWE-406) vulnerability in Palo Alto Networks PAN-OS. A PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks. The DoS attack would appear to originate from a Palo Alto Networks PA-Series (hardware), VM-Series (virtual) and CN-Series (container) firewall against an attacker-specified target. To be misused by an external attacker, the firewall configuration must have a URL filtering profile with one or more blocked categories assigned to a source zone that has an external facing interface. This configuration is not typical for URL filtering and, if set, is likely unintended by the administrator. If exploited, this issue would not impact the confidentiality, integrity, or availability of our products. However, the resulting denial-of-service (DoS) attack may help obfuscate the identity of the attacker and implicate the firewall as the source of the attack. We have taken prompt action to address this issue in our PAN-OS software. All software updates for this issue are expected to be released no later than the week of August 15, 2022. This issue does not impact Panorama M-Series or Panorama virtual appliances. This issue has been resolved for all Cloud NGFW and Prisma Access customers and no additional action is required from them. Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.

Probably yes if any of these apply:

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2022-08-22 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2022-09-12.