CVE-2020-2039 PAN-OS: Management web interface denial-of-service (DoS) through unauthenticated file upload
Description
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.
This issue impacts:
PAN-OS 8.1 versions earlier than PAN-OS 8.1.16;
PAN-OS 9.0 versions earlier than PAN-OS 9.0.10;
PAN-OS 9.1 versions earlier than PAN-OS 9.1.4;
PAN-OS 10.0 versions earlier than PAN-OS 10.0.1.
Product Status
| Versions | Affected | Unaffected |
|---|---|---|
| PAN-OS 10.0 | < 10.0.1 | >= 10.0.1 |
| PAN-OS 9.1 | < 9.1.4 | >= 9.1.4 |
| PAN-OS 9.0 | < 9.0.10 | >= 9.0.10 |
| PAN-OS 8.1 | < 8.1.16 | >= 8.1.16 |
Severity: MEDIUM
CVSSv3.1 Base Score: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Exploitation Status
Palo Alto Networks is not aware of any malicious attempts to exploit this vulnerability.
Palo Alto Networks is aware of publicly available information that may help construct proof of concept exploits for these issues.
Weakness Type
CWE-400 Uncontrolled Resource Consumption
Solution
This issue is fixed in PAN-OS 8.1.16, PAN-OS 9.0.10, PAN-OS 9.1.4, PAN-OS 10.0.1, and all later PAN-OS versions.
Workarounds and Mitigations
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.