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SC-4(2) SC · System and Communications Protection

Multilevel or Periods Processing

LOW MODERATE HIGH
1 Overlay 0 Related Controls
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Requirements NIST SOURCE

Prevent unauthorized information transfer via shared resources in accordance with [procedures] when system processing explicitly switches between different information classification levels or security categories.

Discussion (NIST Supplemental Guidance)

Changes in processing levels can occur during multilevel or periods processing with information at different classification levels or security categories. It can also occur during serial reuse of hardware components at different classification levels. Organization-defined procedures can include approved sanitization processes for electronically stored information.

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-4(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. procedures to prevent unauthorized information transfer via shared resources are defined;
  2. unauthorized information transfer via shared resources is prevented in accordance with <SC-04(02)_ODP procedures> when system processing explicitly switches between different information classification levels or security categories.

Examine

[SELECT FROM: System and communications protection policy; procedures addressing information protection in shared system resources; 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: Mechanisms preventing the unauthorized transfer of information via shared system resources].

Overlays

Showing the OT/ICS overlay for the parent control SC-4 — see the SC-4(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

  • Base control: Included (matches standard baseline)

HIGH

  • Base control: Included (matches standard baseline)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for SC-4(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 security plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation

Testing

  • Mechanisms preventing the unauthorized transfer of information via shared system resources

Other Records

  • procedures addressing information protection in shared system resources
  • system audit records
  • other relevant documents or records