NIST SP 800-171 Rev. 3 3.1.7 — Least Privilege - Privileged Functions

What this control requires

This control prevents non-privileged users from executing privileged functions and mandates logging the execution of such functions. It ensures that only authorized users can perform tasks like system configuration changes, patching, and cryptographic key management, and that all privileged actions are tracked to detect potential misuse or unauthorized access. This control supports the Privileged Function Access Control capability within the Access Control (3.1) family.

In plain English

This control prevents non-privileged users from executing privileged functions and mandates logging the execution of such functions. In practice, this means you can prove you access management-level controls on a defined cadence.

Why it matters

DoD contractors and their subcontractors must implement all 100 SP 800-171 requirements to keep CUI handling contracts. Gaps are scored against the SPRS scoring methodology; below a 110-point starting score, each unmet requirement deducts points and a below-threshold score can disqualify a bid.

This control is rated critical in the source catalogue. Treat gaps here as production incidents in the risk register, not housekeeping.

What an auditor looks for

A C3PAO conducting a CMMC Level 2 assessment uses NIST SP 800-171A objectives. They expect a System Security Plan (SSP), Plan of Action & Milestones (POA&M) for any gaps, and objective evidence (configurations, ticket records, training records) for every requirement.

Within Access Control, the assessor will trace your implementation back to the catalogue reference (Requirement 3.1.7) and look for objective evidence on the latest two assessment cycles.

How to implement

1. Write a short policy stating intent, scope and named owner.
2. Encode it as a platform guardrail — SCP, Azure Policy initiative, Organisation Policy, or repository policy.
3. Wire a monitoring signal that catches drift (CSPM rule, SIEM rule, scheduled query, Workspace alert) and ticket it.
4. Review on a documented cadence and capture the review in the risk register or compliance tracker.

Operational checklist

• Access. Document the trigger, the owner and the cadence.
• Least. Document the trigger, the owner and the cadence.
• Access Control. Document the trigger, the owner and the cadence.
• Configuration. Document the trigger, the owner and the cadence.
• Authorized. Document the trigger, the owner and the cadence.
• Scope: management, privilege, configuration, access control.

Evidence to collect

• Identity Scan. IAM / IdP exports — Entra ID, Okta, IAM Identity Center, Workspace directory — showing accounts, roles, MFA state and last sign-in.

Identity analytics (Okta, SailPoint, Access Analyzer) demonstrates least-privilege. Focus: Least Privilege - Privileged Functions.

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.

• NIST SP 800-53 Rev. 5 AC-6(6) — Privileged Access By Non-Organizational Users
• ISO/IEC 27001:2022 A.8.2 — Privileged access rights
• CIS Controls v8 6.7 — Centralize Access Control
• BSI C5:2020 PS-04 — Physical site access control
• SOC 2 (2017 TSC) CC6.2 — Access Provisioning

Related controls in NIST SP 800-171 Rev. 3

• Requirement 3.1.6 — Least Privilege - Privileged Accounts
• Requirement 3.1.8 — Unsuccessful Logon Attempts
• Requirement 3.1.12 — Remote Access
• Requirement 3.1.11 — Session Termination
• Requirement 3.1.22 — Publicly Accessible Content
• Requirement 3.3.1 — Event Logging

References

• NIST Computer Security Resource Center — NIST SP 800-171 Rev. 3
• Catalogue identifier: Requirement 3.1.7

Topics: identity accesslogging monitoringprivileged accessidentity managementaccess reviewkey management