CISA Warns of Active Exploitation of Palo Alto Networks’ PAN-OS Vulnerability

The U.S. Cybersecurity and Infrastructure Security Agency (CISA)
on Monday added^[1]
a security flaw impacting Palo Alto Networks PAN-OS to its Known Exploited Vulnerabilities
Catalog^[2], based on evidence of
active exploitation.

The high-severity vulnerability, tracked as CVE-2022-0028^[3]
(CVSS score: 8.6), is a URL filtering policy misconfiguration that
could allow an unauthenticated, remote attacker to carry out
reflected and amplified TCP denial-of-service (DoS) attacks.

“If exploited, this issue would not impact the confidentiality,
integrity, or availability of our products,” Palo Alto Networks
said in an alert. “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.

The weakness impacts the following product versions and has been
addressed as part of updates released this month –

• PAN-OS 10.2 (version < 10.2.2-h2)
• PAN-OS 10.1 (version < 10.1.6-h6)
• PAN-OS 10.0 (version < 10.0.11-h1)
• PAN-OS 9.1 (version < 9.1.14-h4)
• PAN-OS 9.0 (version < 9.0.16-h3), and
• PAN-OS 8.1 (version < 8.1.23-h1)

The networking equipment maker said it discovered the
vulnerability after being notified that susceptible firewall
appliances from different vendors, including Palo Alto Networks,
were being used as part of an attempted reflected denial-of-service
(RDoS) attack.

In light of active exploitation, customers of affected products
are advised to apply the relevant patches to mitigate potential
threats. Federal Civilian Executive Branch (FCEB) agencies are
mandated to update to the latest version by September 12, 2022.