Rules of Behavior (03.15.03)_rules-of-behavior

Rules of Behavior (03.15.03) Rules of Behavior

High-Level Description

Family: Planning Framework: NIST SP 800-171 Rev 3 Applicability: Systems processing, storing, or transmitting CUI

Establish rules that describe the responsibilities and expected behavior for system usage and protecting CUI. Provide rules to individuals who require access to the system. Receive a documented acknowledgement from individuals indicating that they have read, understand, and agree to abide by the rules of behavior before authorizing access to CUI and the system. Review and update the rules of behavior [organization-defined].

What to Check

• Verify Rules of Behavior (03.15.03) Rules of Behavior is implemented for CUI systems
• Review SSP documentation for Rules of Behavior (03.15.03)
• Validate CMMC Level 2 assessment objective for Rules of Behavior (03.15.03)
• Confirm POA&M addresses any gaps for Rules of Behavior (03.15.03)

How to Test

Step 1: Review System Security Plan

Examine the SSP for Rules of Behavior (03.15.03) implementation description and responsible parties.

Step 2: Assess Implementation

# Verify security controls protecting CUI
# Check access controls, encryption, monitoring as applicable

# For Linux systems:
ls -la /etc/security/ 2>/dev/null
grep -r "CUI\|controlled" /etc/security/ 2>/dev/null

# For cloud:
# Use cloud-audit-mcp tools to assess posture

Step 3: CMMC Assessment Validation

Verify this requirement passes CMMC Level 2 assessment methodology per SP 800-171A Rev 3.

Tools

Remediation Guide

Requirement Statement

Establish rules that describe the responsibilities and expected behavior for system usage and protecting CUI. Provide rules to individuals who require access to the system. Receive a documented acknowledgement from individuals indicating that they have read, understand, and agree to abide by the rules of behavior before authorizing access to CUI and the system. Review and update the rules of behavior [organization-defined].

Supplemental Guidance

Rules of behavior represent a type of access agreement for system users. Organizations consider rules of behavior for the handling of CUI based on individual user roles and responsibilities and differentiate between rules that apply to privileged users and rules that apply to general users.

Risk Assessment

CWE Categories

References

• NIST SP 800-171 Rev 3
• NIST SP 800-171A Rev 3 (Assessment)
• CMMC Model Overview
• NIST OSCAL Content

Checklist

• SSP documents Rules of Behavior (03.15.03) implementation
• Evidence of operating effectiveness collected
• POA&M addresses any gaps
• CMMC assessment objective met
• Continuous monitoring active