Rules of Behavior (03.15.03)_rules-of-behavior

DevOps & Security

Establish rules that describe the responsibilities and expected behavior for system usage and protecting CUI.

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/NIST/SP800-171_rev3/03.15_planning/Rules%20of%20Behavior%20(03.15.03)_rules-of-behavior/SKILL.md

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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

Tool	Purpose	Usage
cloud-audit-mcp	Assess cloud CUI environment	`cloud_audit_*` tools
Manual Review	SSP and POA&M review	Documentation analysis

Remediation Guide

Requirement Statement

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

Finding	Severity	Impact
Rules of Behavior (03.15.03) Rules of Behavior not implemented	Medium	CUI Protection - Planning
Rules of Behavior (03.15.03) partially implemented (POA&M)	Low	CMMC certification risk

CWE Categories

CWE ID	Title
N/A	No direct CWE mapping

References

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