performing-power-grid-cybersecurity-assessment

What this skill does

# 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 performing-ot-network-security-assessment), 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.

```yaml
# 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.

```python
#!/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):
        """Ge