SC-31(3)_measure-bandwidth-in-operational-environments

SC-31(3) Measure Bandwidth in Operational Environments

Enhancement of: SC-31

High-Level Description

Family: System and Communications Protection (SC) Framework: NIST SP 800-53 Rev 5

Measuring covert channel bandwidth in specified operational environments helps organizations determine how much information can be covertly leaked before such leakage adversely affects mission or business functions. Covert channel bandwidth may be significantly different when measured in settings that are independent of the specific environments of operation, including laboratories or system development environments.

What to Check

• Verify SC-31(3) Measure Bandwidth in Operational Environments is documented in SSP
• Confirm control is operating effectively
• Review evidence of continuous monitoring for SC-31(3)
• Verify enhancement builds upon base control SC-31

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for SC-31(3) implementation details. Verify the organization has documented how this control is satisfied.

Step 2: Validate Implementation

# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly

# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/null

Step 3: Test Operating Effectiveness

Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.

Tools

Remediation Guide

Control Statement

Measure the bandwidth of [organization-defined] in the operational environment of the system.

Implementation Guidance

Measuring covert channel bandwidth in specified operational environments helps organizations determine how much information can be covertly leaked before such leakage adversely affects mission or business functions. Covert channel bandwidth may be significantly different when measured in settings that are independent of the specific environments of operation, including laboratories or system development environments.

Risk Assessment

CWE Categories

References

• NIST SP 800-53 Rev 5 - SC-31(3)
• NIST SP 800-53A Rev 5 (Assessment Procedures)
• NIST SP 800-53 Rev 5 Full Catalog

Checklist

• Control documented in SSP
• Implementation evidence collected
• Operating effectiveness validated
• Continuous monitoring in place
• Related controls (none) reviewed