title: PAN-OS: OS Command Injection in Simple Certificate Enrollment Protocol (SCEP)
description: 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. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20-h1; PAN-OS 9.0 versions earlier than PAN-OS 9.0.14-h3; PAN-OS 9.1 versions earlier than PAN-OS 9.1.11-h2; PAN-OS 10.0 versions earlier than PAN-OS 10.0.8; PAN-OS 10.1 versions earlier than PAN-OS 10.1.3. Prisma Access customers with Prisma Access 2.1 Preferred and Prisma Access 2.1 Innovation firewalls are impacted by this issue.
problem types: CWE-78 OS Command Injection
affected:
{
product: PAN-OS
vendor: Palo Alto Networks
versions:
changes: [at: 8.1.20-h1, status: unaffected], lessThan: 8.1.20-h1, status: affected, version: 8.1, versionType: custom
changes: [at: 9.0.14-h3, status: unaffected], lessThan: 9.0.14-h3, status: affected, version: 9.0, versionType: custom
changes: [at: 9.1.11-h2, status: unaffected], lessThan: 9.1.11-h2, status: affected, version: 9.1, versionType: custom
changes: [at: 10.0.8, status: unaffected], lessThan: 10.0.8, status: affected, version: 10.0, versionType: custom
changes: [at: 10.1.3, status: unaffected], lessThan: 10.1.3, status: affected, version: 10.1, versionType: custom
}
{
product: Prisma Access
vendor: Palo Alto Networks
versions:
status: affected, version: 2.1 Preferred
status: affected, version: 2.1 Innovation
lessThan: 2.2*, status: unaffected, version: all, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 8.1
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]
exploits: Palo Alto Networks is not aware of any malicious exploitation of this issue at time of publication. However, we expect exploits for this issue to become publicly available.
solutions: This issue is fixed in PAN-OS 8.1.20-h1, PAN-OS 9.0.14-h3, PAN-OS 9.1.11-h2, PAN-OS 10.0.8, PAN-OS 10.1.3, and all later PAN-OS versions.
workarounds: 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.