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SC-3(2) SC · System and Communications Protection

Access and Flow Control Functions

LOW MODERATE HIGH
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Requirements NIST SOURCE

Isolate security functions enforcing access and information flow control from nonsecurity functions and from other security functions.

Discussion (NIST Supplemental Guidance)

Security function isolation occurs because of implementation. The functions can still be scanned and monitored. Security functions that are potentially isolated from access and flow control enforcement functions include auditing, intrusion detection, and malicious code protection functions.

Implementation Guidance

Engineering Interpretation

Original engineering commentary written for this explorer — not NIST source text and not authoritative guidance.

No engineering interpretation has been authored for SC-3(2) yet. This section is architected to receive it — see the Requirements and Assessment sections above for the authoritative NIST source content in the meantime.

Assessment

NIST SP 800-53A REV 5.2.0

Assessment Objectives

  1. security functions enforcing access control are isolated from non-security functions;
  2. security functions enforcing access control are isolated from other security functions;
  3. security functions enforcing information flow control are isolated from non-security functions;
  4. security functions enforcing information flow control are isolated from other security functions.

Examine

[SELECT FROM: System and communications protection policy; procedures addressing security function isolation; list of critical security functions; system design documentation; system configuration settings and associated documentation; system audit records system security plan; other relevant documents or records].

Interview

[SELECT FROM: System/network administrators; organizational personnel with information security responsibilities; system developer].

Test

[SELECT FROM: Isolation of security functions enforcing access and information flow control].

Overlays

Showing the OT/ICS overlay for the parent control SC-3 — see the SC-3(2) entries within each baseline below.

OT/ICS Overlay SP 800-82r3

NIST SP 800-82r3 Appendix F, Table 22. Blank baseline means the control/control enhancement is not selected in that initial OT baseline.

LOW

Not applicable at this tier.

MODERATE

Not applicable at this tier.

HIGH

  • Base control: Included (matches standard baseline)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for SC-3(2). This section is architected to display, per product: STIG ID, Finding ID, Severity, Title, Description, Check, Fix, CCI, and NIST control mapping — but nothing is populated here until a real DISA STIG/CCI dataset is ingested.

Learn more about STIG/CCI integration →

Evidence

Potential Evidence — Derived

Categorized from the SP 800-53A "Examine"/"Test" artifact list above by keyword — not an authoritative NIST evidence list.

Policy

  • System and communications protection policy
  • system audit records system security plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation

Testing

  • Isolation of security functions enforcing access and information flow control

Other Records

  • procedures addressing security function isolation
  • list of critical security functions
  • other relevant documents or records