Red Team Security Analysis and Threat Modeling – Siemens Spectrum Power

Red Team Security Analysis and Threat Modeling – Siemens Spectrum Power

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1. Understand the Security Model

Security Triad: Availability, Integrity, Confidentiality

SCADA/EMS systems prioritize availability, which implies:

  • Systems may prioritize uptime over strict security.
  • Explore denial of service (DoS) vectors, which often cause operational disruption and panic.
  • Security patching may be delayed due to fear of downtime — this opens the door to known unpatched CVEs.

2. Infrastructure Clues to Explore

“VPN connections should terminate in the DMZ zone”

  • DMZ placement may enable:
    • Poor segmentation → risk of lateral movement.
    • Misconfigured firewall rules → potential internal access.
    • Split tunneling misuse → external access to internal services.

“Connection via proprietary protocols to Purdue Level 2 (OT) DCS systems”

  • Proprietary protocols often lack proper scrutiny:
    • Poor encryption or authentication.
    • Under-monitored by modern EDR/XDR solutions.
    • Excellent candidates for fuzzing, MITM, and protocol abuse.

“Encrypted transmission via SSL”

  • Older SSL versions (2.0/3.0/TLS 1.0) are vulnerable:
    • Perform cipher suite enumeration.
    • Attempt downgrade attacks or known vulnerabilities like Heartbleed, POODLE, etc.

3. Potential Control Weaknesses from the Requirements List

OC-23: “Identification of local accounts not centrally managed”

  • Implies existence of orphaned local accounts:
    • Excellent targets for persistence.
    • Attack with brute force, password spraying, or pass-the-hash.

OC-25: “Accounts must be centrally managed by an IdP”

  • Central IdP (e.g., SSO, SAML, OAuth2) introduces new attack surface:
    • Test for SSO misconfigurations, JWT tampering, and token replay.

OC-61: “Sensitive information must not be used in test environments without treatment”

  • High likelihood of prod data in dev/test:
    • Likely less protected and monitored.
    • Critical for data exfiltration testing.

4. Operational Weaknesses to Test

OC-15: “Audit event logs must be immutable”

  • Is log immutability enforced with WORM, cryptographic signing, or SIEM retention?
  • Test for log tampering post-compromise.

OC-187: “Credential management procedure”

  • Are password policies enforced in practice?
  • Evaluate password reuse, weak passwords, and rotation failures.

OC-189: “Change management procedure”

  • Simulate insider or admin-level activity.
  • Deploy unauthorized changes or scripts to test detection and response.

5. Artifact Recon: Logs, Backups, and Recovery

“Backups should be stored offline…”

  • Are backups truly offline?
    • Probe for network-accessible shares.
    • Simulate ransomware or file deletion scenarios.

“All platforms must be hardened”

  • Validate hardening consistency across dev/stage/prod.
    • Check for default services, open ports, and missing banners.

6. Red Team Engagement Planning

🔧 Recon / OSINT Phase

  • Enumerate DMZ assets via Shodan, Censys.
  • Identify OT protocols (e.g., S7comm, MODBUS).
  • Capture SSL certificates and evaluate TLS configurations.

🎯 Attack Planning

  • Simulate phishing targeting SCADA engineers and operators.
  • Perform lateral movement from DMZ to SCADA/IdP zones.
  • Abuse local accounts or service accounts.
  • Exfiltrate test environment data containing production PII.

🛠 Tools

  • BloodHound — Graph-based identity attack paths.
  • Responder, NTLMRelayx — SMB/LDAP relay attacks.
  • Impacket, CrackMapExec, SharpHound — Active Directory abuse.
  • Nmap NSE, modscan, S7comm-reader — OT protocol targeting.

PART 1: Threat Modeling Map (STRIDE-Based)

Category Threat Target Asset Possible Weakness Red Team Focus
Spoofing Identity impersonation IdP, SSO tokens Weak or misconfigured identity federation JWT tampering, token replay
Tampering Log manipulation Centralized log repository Weak log integrity or immutability Modify or delete logs post-exploit
Repudiation Undetectable actions Admin actions, test data use Weak audit trail or lack of alerting Simulate insider threat
Information Disclosure Sensitive data leak Test/backup environments Prod data reused in test Exfiltrate test data
Denial of Service System unavailability SCADA/EMS, VPN Security deprioritized over availability DoS on DMZ, VPN endpoints
Elevation of Privilege Lateral escalation Local accounts, OT protocols Orphaned accounts, poor segmentation Privilege escalation to SCADA systems

PART 2: Red Team Checklist / Playbook

🔍 Pre-Engagement Recon

  • DMZ asset discovery (VPN, Web, SSH, etc.)
  • SSL/TLS analysis for weak cipher suites
  • Shodan fingerprinting of SCADA interfaces
  • OT protocol endpoint detection

🔐 Credential & Identity Targeting

  • IdP enumeration (AD FS, Okta, etc.)
  • JWT/SAML token fuzzing
  • Local account discovery (OC-23)
  • Password spraying or brute force attempts

↔️ Lateral Movement

  • Firewall rule abuse (DMZ → Internal)
  • Pivot to Purdue Level 2
  • Shared service account exploitation
  • Test backup credentials from dev/stage

📦 Data Exfiltration / Access

  • Test environments with real PII (OC-61)
  • Backup share crawling (OC-68)
  • Covert exfiltration via DNS/HTTPS

🕳 Persistence & Defense Evasion

  • Deploy stealthy scripts
  • Tamper with logs (OC-15)
  • Modify configs for long-term access

💥 Disruption / Impact Testing

  • DoS VPNs and monitoring nodes
  • Attempt ransomware simulation
  • Validate business continuity resilience

PART 3: Simulated Attack Paths

🚨 Path 1: DMZ to Internal Lateral Movement

Initial Access (Phishing / VPN) → DMZ Jump Host → Weak Firewall Segmentation → Internal AD Join → Service Account Compromise → Access to SCADA/OT via proprietary protocol tunnel

📤 Path 2: Sensitive Data Exfil from Test Environments`

Dev Environment Web Server (via Shodan) → Directory Traversal or RCE Exploit → Discover reused prod data (OC-61 fail) → Archive & exfil via DNS or HTTPS → Clear logs (OC-15 bypass attempt)

🎭 Path 3: Identity Provider Exploitation`

Public-Facing IdP Login Portal → Token Replay or JWT Injection (OC-25 weakness) → Admin Panel Access → Privilege Escalation → Local Account Discovery (OC-23) → Dump secrets / Pivot to internal infrastructure

💾 Path 4: Backup Compromise and Persistence`

DevOps Share / NFS / SMB Backup Share → Mount + Discover Archive Files → Inject Reverse Shell or Malicious Script → Persistence on Backup System → Trigger During Scheduled Restore / Backup Cycle

MITRE ATT&CK Tactic Alignment

Step Tactic Technique Example
Initial Access (Phishing) Initial Access [T1078], [T1566]
DMZ Jump Host Execution [T1059]
Weak Firewall Segmentation Defense Evasion [T1562.004]
Internal AD Join Persistence [T1136.002]
Service Account Compromise Credential Access [T1003]
SCADA/OT Access Impact [T1499], [T1485]

Vulnerabilities

CVE ID Producto(s) Afectado(s) Descripción Fuente Max CVSS EPSS Score Publicado Actualizado CISA KEV Estado de Explotación
CVE-2024-29119 Spectrum Power 7 (< V24Q3) Varios binarios SUID propiedad de root podrían permitir a un atacante local autenticado escalar privilegios. Siemens AG 8.5 0.02% 2024-11-12 2024-11-15 No —
CVE-2023-44120 Spectrum Power 7 (< V23Q4) La configuración de sudo permite a un atacante autenticado ejecutar entradas como root, lo que puede permitir ejecución de código arbitrario. Siemens AG 7.8 0.03% 2024-01-09 2024-01-16 No —
CVE-2023-38557 Spectrum Power 7 (< V23Q3) Script de actualización con permisos indebidos permite a atacante local inyectar código y escalar privilegios. Siemens AG 8.2 0.03% 2023-09-14 2023-09-21 No —
CVE-2022-26476 Spectrum Power 4, 7, MGMS (usando Shared HIS) Un atacante no autenticado puede acceder a Shared HIS con credenciales por defecto, logrando acceso administrativo. Siemens AG 8.8 0.14% 2022-06-14 2022-06-22 No —
CVE-2021-45046 Log4j 2.15.0 (Apache) Bypass parcial del fix anterior (CVE-2021-44228), permitiendo ejecución remota/local de código en configuraciones específicas mediante JNDI Lookup. Apache Software Foundation 9.0 94.31% 2021-12-14 2025-03-12 2023-05-01 Conocido / Público / Ransomware
CVE-2021-44228 Log4j2 2.0-beta9–2.15.0 (excepto ciertas versiones) Permite ejecución remota de código a través de JNDI y mensajes de log manipulados. Exploit muy conocido y ampliamente utilizado en ataques con ransomware. Apache Software Foundation 10.0 94.38% 2021-12-10 2025-02-04 2021-12-10 Conocido / Público / Ransomware
CVE-2019-10933 Spectrum Power 3, 4, 5, 7 (Corporate UI) Vulnerabilidad XSS que requiere que el usuario acceda a un enlace malicioso. No es necesario estar autenticado para que el ataque funcione. Siemens AG 6.1 0.32% 2019-07-11 2019-08-13 No No hay explotación pública conocida

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