undermybelt Performing Power Grid Cybersecurity Assessment
When to Use
- When conducting periodic cybersecurity assessments of power grid facilities per NERC CIP requirements
- When assessing substation automation systems using IEC 61850 GOOSE and MMS protocols
- When evaluating the security of an Energy Management System (EMS) or SCADA control center
- When assessing synchrophasor (PMU) networks and wide-area monitoring systems
- When preparing for regional entity compliance audits or internal security reviews
Do not use for non-BES systems below NERC registration thresholds, for general OT assessment without power grid specifics (see ot-net-sec-assssm), or for physical security assessment of generation facilities without cyber scope.
Prerequisites
- Understanding of electric power grid architecture (generation, transmission, distribution)
- Familiarity with NERC CIP standards and BES Cyber System categorization
- Knowledge of power grid protocols (IEC 61850, IEC 60870-5-104, DNP3, ICCP/TASE.2)
- Passive monitoring tools for substation network traffic analysis
- Access to EMS/SCADA architecture documentation and network diagrams
Workflow
Step 1: Map Power Grid Cyber Architecture
Identify and document all cyber systems supporting grid operations including EMS, SCADA, substation automation, and communication infrastructure.
# Power Grid Cyber Architecture Assessment
facility_type: "Regional Transmission Organization Control Center"
ems_systems:
primary_ems:
vendor: "GE Grid Solutions"
product: "EMS/SCADA (formerly XA/21)"
functions:
- "State estimation"
- "Automatic generation control (AGC)"
- "Security-constrained economic dispatch"
- "Contingency analysis"
protocols:
- "ICCP/TASE.2 (inter-control center)"
- "DNP3 (substation RTU polling)"
- "IEC 60870-5-104 (substation polling)"
backup_control_center:
location: "Geographically diverse backup site"
sync_method: "Real-time database mirroring"
switchover_time: "< 5 minutes"
substation_automation:
count: 145
system_types:
- vendor: "ABB"
product: "RTU560"
protocol: "DNP3 over TCP/IP"
count: 85
- vendor: "SEL"
product: "SEL-3530 RTAC"
protocol: "IEC 61850 MMS + GOOSE"
count: 40
- vendor: "Siemens"
product: "SICAM A8000"
protocol: "IEC 60870-5-104"
count: 20
communications:
primary: "MPLS WAN (carrier-provided)"
backup: "Licensed microwave radio"
last_mile: "Fiber optic to substation"
synchrophasor_network:
pmu_count: 75
pdc: "GE PDC (Phasor Data Concentrator)"
communication: "IEEE C37.118.2 over dedicated network"
data_rate: "30-60 samples per second"
Step 2: Assess Substation Automation Security
Evaluate IEC 61850-based substation automation for protocol security, access controls, and network segmentation.
#!/usr/bin/env python3
"""Power Grid Substation Security Assessor.
Evaluates security of IEC 61850-based substation automation
systems including GOOSE messaging, MMS client/server, and
network architecture.
"""
import json
import sys
from dataclasses import dataclass, field, asdict
from datetime import datetime
@dataclass
class SubstationFinding:
finding_id: str
severity: str
category: str
title: str
description: str
affected_systems: list
nerc_cip_ref: str
iec_62351_ref: str
remediation: str
class SubstationAssessment:
"""Assesses cybersecurity of substation automation systems."""
def __init__(self, substation_name):
self.name = substation_name
self.findings = []
self.counter = 1
def assess_iec61850_security(self, config):
"""Assess IEC 61850 protocol security."""
# GOOSE message authentication
if not config.get("goose_authentication"):
self.findings.append(SubstationFinding(
finding_id=f"SUB-{self.counter:03d}",
severity="critical",
category="Protocol Security",
title="IEC 61850 GOOSE Messages Lack Authentication",
description=(
"GOOSE messages used for protection signaling between IEDs "
"are not authenticated. An attacker on the station bus could "
"inject false trip/close commands to circuit breakers."
),
affected_systems=config.get("goose_publishers", []),
nerc_cip_ref="CIP-005-7 R1.5 - ESP internal communications",
iec_62351_ref="IEC 62351-6 - GOOSE/SV authentication",
remediation=(
"Implement IEC 62351-6 GOOSE authentication using digital "
"signatures. Deploy VLAN isolation for GOOSE traffic as interim."
),
))
self.counter += 1
# MMS service access control
if not config.get("mms_authentication"):
self.findings.append(SubstationFinding(
finding_id=f"SUB-{self.counter:03d}",
severity="high",
category="Protocol Security",
title="MMS Client Connections Lack Authentication",
description=(
"MMS (Manufacturing Message Specification) connections to IEDs "
"do not require client authentication. Any device on the station "
"bus can read/write IED configuration and operate breakers."
),
affected_systems=config.get("mms_servers", []),
nerc_cip_ref="CIP-007-6 R5 - System Access Controls",
iec_62351_ref="IEC 62351-4 - MMS security profiles",
remediation="Enable TLS for MMS connections per IEC 62351-4.",
))
self.counter += 1
# Station bus segmentation
if not config.get("station_bus_segmented"):
self.findings.append(SubstationFinding(
finding_id=f"SUB-{self.counter:03d}",
severity="high",
category="Network Architecture",
title="Flat Station Bus Network Without Segmentation",
description=(
"Station bus connects all IEDs, HMI, engineering access, "
"and WAN gateway on a single VLAN without segmentation."
),
affected_systems=["All station bus devices"],
nerc_cip_ref="CIP-005-7 R1 - ESP boundary",
iec_62351_ref="IEC 62351-10 - Security architecture",
remediation=(
"Segment station bus into VLANs: protection IEDs, "
"measurement IEDs, station HMI, and WAN gateway."
),
))
self.counter += 1
def assess_remote_access(self, config):
"""Assess remote access security for substations."""
if config.get("direct_vendor_access"):
self.findings.append(SubstationFinding(
finding_id=f"SUB-{self.counter:03d}",
severity="critical",
category="Remote Access",
title="Direct Vendor Remote Access to Substation Without MFA",
description=(
"Vendor support has direct VPN access to substation network "
"without traversing an intermediate system or requiring MFA."
),
affected_systems=["Substation WAN gateway"],
nerc_cip_ref="CIP-005-7 R2 - Remote Access Management",
iec_62351_ref="IEC 62351-8 - Role-based access control",
remediation=(
"Route vendor access through corporate jump server with MFA. "
"Implement session recording per CIP-005-7 R2.4."
),
))
self.counter += 1
def generate_report(self):
"""Generate substation assessment report."""
report = []
report.append("=" * 70)
report.append(f"SUBSTATION CYBERSECURITY ASSESSMENT: {self.name}")
report.append(f"Date: {datetime.now().isoformat()}")
report.append("=" * 70)
for sev in ["critical", "high", "medium", "low"]:
findings = [f for f in self.findings if f.severity == sev]
if findings:
report.append(f"\n--- {sev.upper()} ({len(findings)}) ---")
for f in findings:
report.append(f" [{f.finding_id}] {f.title}")
report.append(f" {f.description[:100]}...")
report.append(f" NERC CIP: {f.nerc_cip_ref}")
report.append(f" Remediation: {f.remediation[:80]}...")
return "\n".join(report)
if __name__ == "__main__":
assessment = SubstationAssessment("Substation Alpha - 345kV")
assessment.assess_iec61850_security({
"goose_authentication": False,
"mms_authentication": False,
"station_bus_segmented": False,
"goose_publishers": ["SEL-411L-01", "SEL-411L-02", "SEL-487E-01"],
"mms_servers": ["SEL-3530-RTAC", "ABB-REF615-01"],
})
assessment.assess_remote_access({
"direct_vendor_access": True,
})
print(assessment.generate_report())
Key Concepts
| Term | Definition |
|---|---|
| IEC 61850 | International standard for communication networks and systems in substations, using GOOSE for protection signaling and MMS for SCADA data |
| GOOSE | Generic Object Oriented Substation Event - multicast protocol for fast peer-to-peer protection signaling between IEDs (< 4ms trip time) |
| MMS | Manufacturing Message Specification - client/server protocol for reading/writing IED data and operating circuit breakers |
| IEC 62351 | Security standard series for power system communication protocols providing authentication and encryption for IEC 61850, DNP3, and IEC 104 |
| ICCP/TASE.2 | Inter-Control Center Communications Protocol for data exchange between control centers of different utilities |
| Synchrophasor (PMU) | Phasor Measurement Unit providing time-synchronized voltage/current measurements at 30-60 samples/second for wide-area monitoring |
Tools & Systems
- Dragos Platform: OT security platform with specific threat intelligence on power grid-targeting groups (ELECTRUM, KAMACITE)
- SEL-3620 Ethernet Security Gateway: Substation security device providing encryption, access control, and intrusion detection
- GRIDsure: Power grid cybersecurity assessment framework by Idaho National Laboratory
- Wireshark with IEC 61850 Dissector: Protocol analysis for GOOSE and MMS traffic in substations
Output Format
Power Grid Cybersecurity Assessment Report
=============================================
Facility: [Name and Type]
NERC Registration: [Entity ID]
BES Impact Rating: [High/Medium/Low]
SUBSTATION FINDINGS: [N]
EMS/SCADA FINDINGS: [N]
COMMUNICATION FINDINGS: [N]
NERC CIP COMPLIANCE:
CIP-002: [Status]
CIP-005: [Status]
CIP-007: [Status]