Penetration Testing for Manufacturing Companies

Introduction

Manufacturing companies are undergoing a fundamental transformation. The convergence of operational technology (OT) and information technology (IT) has created unprecedented efficiency gains—but also unprecedented security risks. Systems that once operated in isolation are now connected to corporate networks, cloud platforms, and the internet.

This connectivity exposes manufacturers to attacks that can disrupt production, steal intellectual property, and even endanger worker safety. The ransomware attack on Colonial Pipeline demonstrated how operational disruptions can cascade through entire supply chains. For manufacturers, similar attacks can halt production lines, corrupt quality control systems, and compromise proprietary manufacturing processes.

Traditional IT security assessments often miss the unique vulnerabilities in manufacturing environments. Industrial control systems, SCADA networks, and IoT devices require specialized testing approaches that understand both cyber risks and physical safety considerations.

This guide covers everything manufacturing companies need to know about penetration testing: OT/IT convergence security, industrial control system assessment, supply chain protection, and strategies for securing intellectual property in connected manufacturing environments.

Why Manufacturing Faces Unique Security Challenges

OT/IT Convergence Risks

The blending of operational and information technology creates new attack surfaces:

• Legacy OT systems: Designed for reliability, not security, often running decades-old software
• Increased connectivity: Previously air-gapped systems now connected for monitoring and analytics
• Protocol vulnerabilities: Industrial protocols like Modbus, DNP3, and OPC lack authentication
• Patching constraints: Production systems can't be easily updated without downtime

Intellectual Property Exposure

Manufacturing IP is highly valuable and frequently targeted:

• Product designs: CAD files, specifications, and engineering documents
• Process knowledge: Manufacturing methods, quality parameters, and formulations
• Supply chain data: Vendor relationships, pricing, and logistics information
• Customer data: Order information, specifications, and business relationships

Supply Chain Complexity

Modern manufacturing involves extensive third-party relationships:

• Supplier integrations: EDI connections, vendor portals, and just-in-time systems
• Customer connections: Order management, shipping, and quality systems
• Service providers: Equipment vendors with remote access for maintenance
• Contract manufacturers: Shared production data and quality systems

Safety Implications

Unlike most industries, manufacturing security failures can cause physical harm:

• Equipment manipulation: Attackers could alter machine parameters
• Quality system compromise: Tampering with specifications or testing
• Safety system bypass: Disabling protective controls or alarms
• Environmental risks: Releasing hazardous materials or pollutants

Regulatory and Customer Requirements

Industry-Specific Standards

Manufacturing security testing should address applicable frameworks:

• NIST Cybersecurity Framework: Widely adopted baseline for manufacturing security
• IEC 62443: Industrial automation and control systems security
• ISO 27001: Information security management systems
• CMMC: For manufacturers in the defense supply chain
• FDA 21 CFR Part 11: For pharmaceutical and medical device manufacturers

Automotive Industry Requirements

Manufacturers in automotive supply chains face specific mandates:

• TISAX: Trusted Information Security Assessment Exchange for automotive
• IATF 16949: Quality management with cybersecurity components
• OEM requirements: Direct security mandates from automakers

Customer Security Requirements

Large customers increasingly mandate supplier security:

• Security questionnaires: Detailed assessments of security practices
• Right to audit: Contractual provisions for customer security reviews
• Incident notification: Requirements to report security events
• Third-party assessments: Independent verification of security controls

Common Vulnerabilities in Manufacturing Environments

1. OT Network Segmentation Failures

The boundary between IT and OT is often inadequately protected:

• Flat network architectures: Corporate and production networks interconnected
• Jump server weaknesses: Compromised IT systems enabling OT access
• Historian server exposure: Data collection systems bridging network segments
• Remote access gaps: VPN or remote desktop exposing production systems

Example scenario: A production historian server is accessible from the corporate network with default or weak credentials, providing attackers a path from a compromised workstation to production-adjacent systems.

2. Industrial Control System Vulnerabilities

ICS and SCADA systems have inherent security weaknesses:

• Unauthenticated protocols: Modbus, DNP3, and others lack security features
• Default credentials: HMIs and PLCs with unchanged factory passwords
• Unpatched systems: Controllers running vulnerable firmware
• Insecure remote access: Vendor maintenance connections without adequate controls

3. Engineering Workstation Compromise

Systems used for programming and configuration are high-value targets:

• Inadequate protection: Engineering PCs without endpoint security
• USB and removable media: Attack vectors for air-gapped networks
• Development tool vulnerabilities: Exploitable software used for PLC programming
• Source code exposure: Project files containing production logic

4. Supply Chain Integration Weaknesses

Connections to suppliers and customers create exposure:

• EDI system vulnerabilities: Insecure electronic data interchange
• Supplier portal weaknesses: Authentication and access control gaps
• Third-party remote access: Vendor maintenance connections
• Cloud-based supply chain platforms: SaaS security and integration risks

5. Intellectual Property Protection Gaps

Proprietary information is often inadequately protected:

• CAD/CAM system access controls: Over-permissive access to designs
• Document management weaknesses: Inadequate protection of technical documents
• Email data leakage: Designs and specifications shared insecurely
• Backup exposure: Unencrypted backups containing IP

Building a Manufacturing Penetration Testing Program

Defining OT Testing Boundaries

Testing in manufacturing environments requires careful scoping:

Safe to test:

• IT networks and business systems
• Engineering workstations (with proper coordination)
• Network infrastructure and segmentation
• Historian and data collection systems
• Remote access infrastructure

Requires special consideration:

• Connections to production networks (observation and passive testing)
• Industrial protocols (non-disruptive assessment)
• Safety systems (typically exclude from active testing)
• Live production environments (test on staging or during downtime)

Testing Frequency and Scope

Manufacturing companies should establish testing cadences:

OT Security Assessment Methodology

Testing industrial environments requires specialized approaches:

1. Asset discovery: Identify all connected devices, protocols, and communications
2. Architecture review: Evaluate network segmentation and trust boundaries
3. Protocol analysis: Assess industrial protocol security (passive capture)
4. Access control testing: Validate authentication and authorization
5. Remote access assessment: Test vendor and employee remote connections
6. IT/OT boundary testing: Attempt to traverse from corporate to production
7. Configuration review: Evaluate ICS device security settings

Safety Considerations

Manufacturing penetration testing must prioritize safety:

• Coordination with operations: Schedule testing to avoid production impact
• Read-only OT assessment: Passive observation rather than active exploitation
• Emergency procedures: Clear escalation and rollback plans
• Safety system exclusions: Never test live safety or protective systems
• Change management: Follow plant change control processes

Protecting Intellectual Property

IP Asset Identification

Understand what needs protection:

• Product designs: CAD files, engineering drawings, specifications
• Process documentation: Manufacturing procedures, quality parameters
• Software and firmware: Proprietary code for products and equipment
• Business information: Customer data, pricing, supply chain details

Security Testing for IP Protection

Testing should validate IP security controls:

• Access control verification: Who can access sensitive design files?
• Data exfiltration testing: Can users extract large volumes of IP?
• Email and collaboration security: Are designs shared securely?
• Backup and archive protection: Is historical IP adequately secured?
• Third-party access: Can vendors or partners access unrelated IP?

Manufacturing Penetration Testing Checklist

Before your next security assessment, verify:

• OT/IT network segmentation validated
• Industrial protocol security assessed (passive/non-disruptive)
• Remote access infrastructure tested (VPN, vendor access)
• Engineering workstation security evaluated
• Historian and data collection system access controls validated
• Supply chain integration security assessed
• IP protection controls tested (CAD, documents, designs)
• Cloud and IIoT platform security evaluated
• Incident detection capabilities validated for OT environments
• Testing coordination completed with operations
• Safety systems appropriately excluded from active testing
• Findings mapped to applicable compliance frameworks

The Cost of Inadequate Security Testing

Manufacturing security failures carry industry-specific consequences:

• Production disruption: Ransomware and attacks can halt manufacturing
• Safety incidents: Compromised systems can endanger workers
• IP theft: Lost competitive advantage from stolen designs and processes
• Supply chain impact: Your breach affects customer operations
• Quality system compromise: Tampered specifications affect product safety
• Regulatory penalties: FDA, automotive, and other sector-specific consequences

The Norsk Hydro ransomware attack cost over $70 million and forced the company to revert to manual operations. Triton malware demonstrated that attackers can target safety systems in industrial environments.

Conclusion

Manufacturing companies face security challenges that span traditional IT systems, operational technology, and the increasingly blurred boundary between them. Annual IT-focused assessments miss critical vulnerabilities in industrial control systems, OT networks, and supply chain integrations.

Effective security testing for manufacturers requires understanding the unique constraints of production environments—safety considerations, availability requirements, and legacy system limitations—while still validating that critical controls are working. Testing programs should address IP protection, OT/IT segmentation, and supply chain security alongside traditional application and network assessment.

RedVeil's AI-powered penetration testing helps manufacturing companies validate OT/IT security boundaries and protect intellectual property with on-demand testing designed for the constraints of production environments.

Start testing your manufacturing environment today.