Zscalerは10月14日(米国時間)、「Technical Analysis of Windows CLFS Zero-Day Vulnerability CVE-2022-37969 – Part 1: Root Cause Analysis」において、Windows共通ログファイルシステム(CLFS: Common Log File System)ドライバに存在した特権昇格の脆弱性に関する詳細な分析結果を伝えた。
Description An authentication bypass vulnerability in the Palo Alto Networks PAN-OS 8.1 web interface allows a network-based attacker with specific knowledge of the target firewall or Panorama appliance to impersonate an existing PAN-OS administrator and perform privileged actions.
Severity:HIGH CVSSv3.1 Base Score:8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
Exploitation Status Palo Alto Networks is not aware of any malicious exploitation of this issue.
Weakness Type CWE-290 Authentication Bypass by Spoofing
Solution This issue is fixed in PAN-OS 8.1.24 and all later PAN-OS versions.
Please note that PAN-OS 8.1 has reached its software end-of-life (EoL) and is supported only on PA-200, PA-500, and PA-5000 Series firewalls and on M-100 appliances and only until each of their respective hardware EoL dates: https://www.paloaltonetworks.com/services/support/end-of-life-announcements/hardware-end-of-life-dates.html.
Workarounds and Mitigations Customers with a Threat Prevention subscription can block known attacks for this vulnerability by enabling Threat ID 92720 (Applications and Threats content update 8630-7638).
To exploit this issue, the attacker must have network access to the PAN-OS web interface. You can mitigate the impact of this issue by following best practices for securing the PAN-OS web interface. Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation at https://docs.paloaltonetworks.com/best-practices/10-1/administrative-access-best-practices/administrative-access-best-practices/deploy-administrative-access-best-practices.