PAN-OS: Management web interface denial-of-service (DoS) through unauthenticated file upload

An uncontrolled resource consumption vulnerability in Palo Alto Networks PAN-OS allows for a remote unauthenticated user to upload temporary files through the management web interface that are not properly deleted after the request is finished. It is possible for an attacker to disrupt the availability of the management web interface by repeatedly uploading files until available disk space is exhausted.

Work around:
Until PAN-OS software is upgraded to a fixed version, enabling signatures for Unique Threat ID 59957 on traffic destined for the GlobalProtect portal, gateway, or VPN will block attacks against CVE-2020-2039.

This issue impacts the PAN-OS management web interface but you can mitigate the impact of this issue by following best practices for securing the PAN-OS management web interface. Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation, available at https://docs.paloaltonetworks.com/best-practices.