NIST SP 800-53 Rev. 5 MA-5(2) — Security Clearances For Classified Systems

What this control requires

Control mandates procedures for Maintenance personnel lacking security clearances or U.S. citizenship, requiring escort and supervision, sanitization of volatile storage, and organization-defined alternate controls when sanitization is not feasible. This control supports the Access Control System capability within the Maintenance family.

In plain English

Control mandates procedures for Maintenance personnel lacking security clearances or U.S. In practice, this means you can prove you policy procedures-level controls on a defined cadence.

Why it matters

SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed.

This control is rated high. Auditors expect a named owner, a remediation SLA, and a tooling artefact that evidences continuous operation.

What an auditor looks for

A 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan.

Within Maintenance, the assessor will trace your implementation back to the catalogue reference (Control MA-5(2)) and look for objective evidence on the latest two assessment cycles.

How to implement

Policy Management

Docs. Keep each policy in version-controlled Markdown alongside the code that implements it; ship a signed PDF snapshot at each annual review and link the SHA into the SoA.

Operational checklist

• Policy. Document the trigger, the owner and the cadence.
• Access. Document the trigger, the owner and the cadence.
• Security. Document the trigger, the owner and the cadence.
• Maintenance. Document the trigger, the owner and the cadence.
• Access Control. Document the trigger, the owner and the cadence.
• Scope: procedures, management, access control, organization, system, sanitization, personnel, controls.

Evidence to collect

• Policy Document. A signed and version-controlled policy / standard / procedure document.

Signed policy or standard documents the safeguard. Focus: Security Clearances For Classified Systems.

Common pitfalls

• Policies that no engineer has read; the version in Confluence drifts from the version that's actually being enforced.

How it maps to other frameworks

Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit.

• HIPAA (45 CFR Part 164) 164.310(a)(2)(iv) — Facility Access Controls - Maintain Maintenance Records
• NIST SP 800-171 Rev. 3 3.1.20 — Use of External Systems

Related controls in NIST SP 800-53 Rev. 5

• Control MA-5(1) — Individuals Without Appropriate Access
• Control PS-3(1) — Classified Information
• Control AC-16(6) — Maintenance Of Attribute Association
• Control AC-20 — Use Of External Systems
• Control MA-5 — Maintenance Personnel
• Control MA-6(3) — Automated Support For Predictive Maintenance

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control MA-5(2)

Topics: governance riskpolicy management