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AC-1: ACCESS CONTROL POLICY AND PROCEDURES

  • ICS Control Baselines:
  • Low
  • Moderate
  • High

The organization:

    • a. Develops, documents, and disseminates to [Assignment: organization-defined personnel or roles]:
      1. An access control policy that addresses purpose, scope, roles, responsibilities, management commitment, coordination among organizational entities, and compliance; and
      2. Procedures to facilitate the implementation of the access control policy and associated access controls; and
    • b. Reviews and updates the current:
      1. Access control policy [Assignment: organization-defined frequency]; and
      2. Access control procedures [Assignment: organization-defined frequency].

SUPPLEMENTAL GUIDANCE

This control addresses the establishment of policy and procedures for the effective implementation of selected security controls and control enhancements in the AC family. Policy and procedures reflect applicable federal laws, Executive Orders, directives, regulations, policies, standards, and guidance. Security program policies and procedures at the organization level may make the need for system-specific policies and procedures unnecessary. The policy can be included as part of the general information security policy for organizations or conversely, can be represented by multiple policies reflecting the complex nature of certain organizations. The procedures can be established for the security program in general and for particular information systems, if needed. The organizational risk management strategy is a key factor in establishing policy and procedures.

ICS SUPPLEMENTAL GUIDANCE

The policy specifically addresses the unique properties and requirements of ICS and the relationship to non-ICS systems. ICS access by vendors and maintenance staff can occur over a very large facility footprint or geographic area and into unobserved spaces such as mechanical/electrical rooms, ceilings, floors, field substations, switch and valve vaults, and pump stations.

CONTROL ENHANCEMENTS

NO CONTROL ENHANCEMENTS

REFERENCES:

  • NIST Special Publication 800-82
  • NIST Special Publication 800-12
  • NIST Special Publication 800-82 | GUIDE TO INDUSTRIAL CONTROL SYSTEMS (ICS) SECURITY
  • NIST Special Publication 800-100