Revision 1.0 — 2026-07-15
This hunt seeks evidence of abuse of three vulnerabilities disclosed in Siemens advisory SSA-104023 affecting Palo Alto Networks PAN-OS running on RUGGEDCOM APE1808 application processing engines: an OS command injection allowing root-level command execution (CVE-2026-0273), a missing-authorization privilege escalation to root via the command line interface (CVE-2026-0272), and a stored cross-site scripting flaw in the web management interface (CVE-2026-0266). All three require authenticated administrator access, so the hunt is oriented toward detecting misuse of administrative access to the firewall, root-level activity on the appliance, and post-compromise pivoting across the IT/OT boundary that the device enforces.
The environment in scope is the management plane of every RUGGEDCOM APE1808 hosting a PAN-OS Virtual NGFW, the administrative workstations and jump hosts used to reach those devices, and the OT-adjacent Windows hosts and industrial network segments that sit behind the firewall. Because the APE1808 firewall is not itself a CrowdStrike-managed endpoint, endpoint telemetry is applied to the administrative workstations and jump hosts that connect to the management interface and to the OT-adjacent hosts that would be reached during a pivot; PAN-OS system, configuration, and traffic logs forwarded to the SIEM provide device-side visibility.
The time window for the hunt is the 60 days preceding execution, extended to the earliest available PAN-OS configuration log if a suspicious change is identified, to capture any administrative activity predating the advisory publication date of 2026-07-14. All hostnames, IP ranges, subnets, and notification handles in this plan are generic placeholders and must be replaced with environment-specific values before execution. No production or client-identifying data is embedded in this document.
Hypothesis 1: An adversary holding authenticated administrator credentials has abused CVE-2026-0273 or CVE-2026-0272 to execute commands as root on an APE1808 PAN-OS instance, observable as anomalous CLI configuration activity in PAN-OS logs and unexpected management-plane sessions from administrative workstations.
MITRE ATT&CK: Privilege Escalation | T1068 — Exploitation for Privilege Escalation | The missing-authorization and command-injection flaws let an authenticated admin obtain root on the appliance.
MITRE ATT&CK: Execution | T1059 — Command and Scripting Interpreter | Root-level arbitrary command execution is reached through the PAN-OS CLI.
Collection Queries
CrowdStrike Falcon CQL — management-plane sessions from administrative workstations to the firewall management subnet:
#event_simpleName = "NetworkConnectIP4"
| in(RemotePort, values=["22","443"])
| cidr(RemoteAddressIP4, subnet=["10.10.20.0/24"])
| join(query=