Smart Meter Gateway (SMGWA) Penetration Testing

The German Metering Point Operation Act (Messstellenbetriebsgesetz, MsbG) and BSI Technical Guideline TR-03109-6 define binding security requirements for the Smart Meter Gateway (SMGW) and its administration environment. Gateway administrators (GWA) and metering point operators (MPO) must demonstrate regular security assessments of their systems – including penetration tests of the gateway administration and the connected back-end systems.

TR-03109-6 specifies detailed security profiles for the SMGW itself, for the WAN interface, for the Home Area Network (HAN) interface and for the local metrological network (LMN) interface. An SMGWA penetration test verifies whether the implemented security controls comply with the TR’s requirements and whether real-world attack vectors exist that were not anticipated in the specification.

Blackfort Technology has deep expertise in the security architecture of smart-metering infrastructures. We perform penetration tests that not only cover the normative requirements of TR-03109-6 but also go beyond the minimum, ensuring genuine resilience against current attack techniques.

A full SMGWA penetration test covers several testing areas: the WAN communications infrastructure between SMGW and gateway administrator is examined for weaknesses in TLS configuration, certificate validation and protocol implementation. The gateway administration portal and its management APIs are tested for authentication weaknesses, authorisation flaws and injection vulnerabilities.

For the connection of grid operators and energy suppliers (consumer-facing interfaces) we analyse permission concepts and check whether unauthorised metering-data access or manipulation is possible. The SMGW firmware update process is examined for supply-chain attack vectors. Depending on the engagement scope, a hardware-level analysis (JTAG, UART, flash dump) can also be performed.

For evidence to the BSI and regulatory authorities we produce an audit-ready report in the format of the BSI Penetration Testing Guideline. The report classifies all findings according to CVSS v3.1, contains proof-of-concept evidence and prioritised recommendations with concrete remediation steps.

We follow a structured testing process in four phases: reconnaissance & scoping (system inventory, network topology, interface analysis), threat modelling (attacker modelling under BSI IT-Grundschutz and STRIDE), active testing (manual testing and automated scans) and reporting & follow-up (finding assessment, remediation guidance, retest).

For SMGWA environments we use specialised tools: alongside standard pentesting frameworks (Metasploit, Burp Suite Professional) we employ ICS/SCADA-specific scanners and proprietary test scripts for smart-metering protocols. Our testers hold BSI IT-Grundschutz competence as well as OSCP/GPEN certifications.

Tests are performed in a dedicated test environment or in clearly bounded maintenance windows to avoid impact on production. For production-system tests (black box, external) we draft a written test concept upfront and obtain the necessary approvals.

For SMGW manufacturers pursuing BSI certification under Common Criteria (CC) or the SMGW Protection Profile we perform preparatory security evaluations. These evaluations identify weaknesses that would be uncovered in a formal CC evaluation by an accredited IT security lab – earlier in the process and therefore at significantly lower cost.

For gateway administrators who must provide evidence of their security assessments to metering point operators or regulators, we deliver audit-grade test reports. On request we coordinate alignment with the BSI as part of the assessment process.

Blackfort supports you beyond the pentest itself: after critical findings have been remediated we perform a free retest of the resolved weaknesses. For organisations operating SMGWA infrastructure continuously, we recommend an annual penetration testing programme that continuously accounts for the evolving threat landscape.