# Control system security

Control system security, or automation and control system (ACS) cybersecurity, is the prevention of (intentional or unintentional) interference with the proper operation of industrial automation and control systems. These control systems manage essential services including electricity, petroleum production, water, transportation, manufacturing, and communications. They rely on computers, networks, operating systems, applications, and programmable controllers, each of which could contain security vulnerabilities. The 2010 discovery of the Stuxnet worm demonstrated the vulnerability of these systems to cyber incidents. The United States and other governments have passed cyber-security regulations requiring enhanced protection for control systems operating critical infrastructure.
Control system security is known by several other names such as SCADA security, PCN security, Industrial network security, Industrial control system (ICS) Cybersecurity, Operational Technology (OT) Security, Industrial automation and control systems and Control System Cyber Security.

## Risks

Insecurity of, or vulnerabilities inherent in automation and control systems (ACS) can lead to severe consequences in categories such as safety, loss of life, personal injury, environmental impact, lost production, equipment damage, information theft, and company image.
Guidance to assess, evaluate and mitigate these potential risks is provided through the application of many Governmental, regulatory, industry documents and Global Standards, addressed below.

## Vulnerability of automation and control systems

Automation and Control Systems (ACS) have become far more vulnerable to security incidents due to the following trends.
* Increasing use of Commercial Off-the Shelf Technology (COTS) and protocols. Integration of technology such as MS Windows, SQL, and Ethernet means that these systems may now have the same or similar vulnerabilities as common IT systems.
* Enterprise integration (using plant, corporate and even public networks) means that these (legacy) systems may now be subjected to stresses that they were not designed for.
* Demand for Remote Access - 24x7 access for engineering, operations or technical support increases the attack surface, possibly leading to more insecure or rogue connections.
* Increased awareness and understanding of industrial systems - As more and more people become aware of these systems, the strategy of Security Through Obscurity is no longer viable.
* Although the cyber threats and attack strategies on automation systems are changing rapidly, regulation of industrial control systems for security is rare and is a slow-moving process. The United States, for example, only does so for the nuclear power and the chemical industries.

## Government efforts

The U.S. Government Computer Emergency Readiness Team (US-CERT) originally instituted a control systems security program (CSSP) now the National Cybersecurity and Communications Integration Center (NCCIC) Industrial Control Systems, which has made available a large set of free National Institute of Standards and Technology (NIST) standards documents regarding control system security. The U.S. Government Joint Capability Technology Demonstration (JCTD) known as MOSIACS (More Situational Awareness for Industrial Control Systems) is the initial demonstration of cybersecurity defensive capability for critical infrastructure control systems. MOSAICS addresses the Department of Defense (DOD) operational need for cyber defense capabilities to defend critical infrastructure control systems from cyber attack, such as power, water and wastewater, and safety controls, affect the physical environment. The MOSAICS JCTD prototype will be shared with commercial industry through Industry Days for further research and development, an approach intended to lead to an innovative, game-changing capabilities for cybersecurity for critical infrastructure control systems.

## Automation and Control System Cybersecurity Standards

The international standard for cybersecurity of automation and control systems is the IEC 62443. In addition, multiple national organizations such as the NIST and NERC in the USA released guidelines and requirements for cybersecurity in control systems.

### IEC 62443

The IEC 62443 cybersecurity standards define processes, techniques and requirements for Automation and Control Systems (IACS). The IEC 62443 standards and technical reports are organized into four general categories called General, Policies and Procedures, System, Component, Profiles and Evaluation.
* The first category includes foundational information such as concepts, models and terminology.
* The second category of work products targets the Asset Owner. These address various aspects of creating and maintaining an effective IACS security program.
* The third category includes work products that describe system design guidance and requirements for the secure integration of control systems. Core in this is the zone and conduit design model.
* The fourth category includes work products that describe the specific product development and technical requirements of control system products.
* The fifth category provides profiles for industry-specific cybersecurity requirements according to IEC 62443-1-5.
* The sixth category defines assessment methodologies that ensure that assessment results are consistent and reproducible.

### NERC

The most widely recognized and latest NERC security standard is NERC 1300, which is a modification/update of NERC 1200. The latest version of NERC 1300 is called CIP-002-3 through CIP-009-3, with CIP referring to Critical Infrastructure Protection. These standards are used to secure bulk electric systems although NERC has created standards within other areas. The bulk electric system standards also provide network security administration while still supporting best-practice industry processes.

### NIST

Although it is not a standard, the NIST Cybersecurity Framework (NIST CSF) provides a high-level taxonomy of cybersecurity outcomes and a methodology to assess and manage those outcomes. It is intended to help private sector organizations that provide critical infrastructure with guidance on how to protect it.
NIST Special Publication 800-82 Rev. 2 "Guide to Industrial Control System (ICS) Security" describes how to secure multiple types of Industrial Control Systems against cyber attacks while considering the performance, reliability, and safety requirements specific to ICS.

## Control system security certifications

Certifications for control system security have been established by several global Certification Bodies. Most of the schemes are based on the IEC 62443 and describe test methods, surveillance audit policy, public documentation policies, and other specific aspects of their program.