QID 730283

Date Published: 2021-11-25

QID 730283: Palo Alto Networks (PAN-OS) OS Command Injection in Simple Certificate Enrollment Protocol (SCEP) Vulnerability (PAN-176661)

PAN OS is the software that runs all Palo Alto Networks next-generation firewalls.

An OS command injection vulnerability in the Simple Certificate Enrollment Protocol (SCEP) feature of PAN-OS software allows an unauthenticated network-based attacker with specific knowledge of the firewall configuration to execute arbitrary code with root user privileges. The attacker must have network access to the GlobalProtect interfaces to exploit this issue.
Affected Versions:
PAN-OS 10.1 versions earlier than PAN-OS 10.1.3
PAN-OS 10.0 versions earlier than PAN-OS 10.0.8
PAN-OS 9.1 versions earlier than PAN-OS 9.1.11-h2
PAN-OS 9.0 versions earlier than PAN-OS 9.0.14-h3
PAN-OS 8.1 versions earlier than PAN-OS 8.1.20-h1
QID Detection Logic (Authenticated):
This QID looks for the vulnerable version of PAN-OS

NOTE:This issue is applicable only to GlobalProtect portal and gateway configurations that are configured with a SCEP profile and when the default master key was not changed. You can determine if your configuration has a SCEP profile by selecting 'Device > Certificate Management > SCEP' from the web interface. Note: The SCEP profile does not need to be enabled for the firewall to be at risk; it need only exist in the configuration to be a risk even if disabled. You know you are using the default master key when the master key was not explicitly configured on the firewall. Review the master key configuration by selecting 'Device > Master Key and Diagnostics' from the web interface and change the key if needed.

CVSS V3 rated as Critical - 8.1 severity.

CVSS V2 rated as Critical - 9.3 severity.

Solution

Refer to PAN-176661 for more information about patching this vulnerability.
Workaround:
Changing the master key for the firewall prevents exploitation of this vulnerability. This is a security best practice for both PAN-OS and Prisma Access customers. Documentation for configuring the master key is available at: https://docs.paloaltonetworks.com/pan-os/10-0/pan-os-admin/certificate-management/configure-the-master-key.html. Please note the special requirements for high-availability (HA) and Panorama-managed environments. Additional information is available for Prisma Access customers at: https://docs.paloaltonetworks.com/prisma/prisma-access/innovation/2-1/prisma-access-panorama-admin/prepare-the-prisma-access-infrastructure/get-started-with-prisma-access-overview.html. Remove all configured SCEP profiles from the firewall to completely eliminate any risk of exploitation related to this issue. You can view any existing SCEP profiles configured on the firewall by selecting 'Device > Certificate Management > SCEP' from the web interface. This issue requires the attacker to have network access to the GlobalProtect interface. In addition to these workarounds, you should enable signatures for Unique Threat ID 91526 on traffic destined for GlobalProtect interfaces to further mitigate the risk of attacks against CVE-2021-3060. SSL decryption is not necessary to detect attacks against this issue.

Vendor References

PAN-176661 - security.paloaltonetworks.com/CVE-2021-3060

CVEs related to QID 730283

CVE-2021-3060 |

Software Advisories

Advisory ID	Software	Component	Link
PAN-176661			security.paloaltonetworks.com/CVE-2021-3060

By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].