network-disconnect-03-13-09-network-disconnect

name	Network Disconnect (03.13.09)_network-disconnect
description	Network Disconnect
category	configuration
version	3.0
author	cyberstrike-official
tags	["nist","sp800-171","rev3","network disconnect (03-13-09)","family-03.13","cui-protection","cmmc"]
tech_stack	["aws","azure","gcp","linux","windows","network"]
cwe_ids	["CWE-311"]
chains_with	[]
prerequisites	[]
severity_boost	{}

Network Disconnect (03.13.09) Network Disconnect

High-Level Description

Family: System and Communications Protection Framework: NIST SP 800-171 Rev 3 Applicability: Systems processing, storing, or transmitting CUI

Network Disconnect

What to Check

• Verify Network Disconnect (03.13.09) Network Disconnect is implemented for CUI systems
• Review SSP documentation for Network Disconnect (03.13.09)
• Validate CMMC Level 2 assessment objective for Network Disconnect (03.13.09)
• Confirm POA&M addresses any gaps for Network Disconnect (03.13.09)

How to Test

Step 1: Review System Security Plan

Examine the SSP for Network Disconnect (03.13.09) 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

Implement Network Disconnect per NIST SP 800-171 Rev 3.

Supplemental Guidance

This requirement applies to internal and external networks. Terminating network connections associated with communications sessions includes deallocating TCP/IP addresses or port pairs at the operating system level or deallocating networking assignments at the application level if multiple application sessions are using a single network connection. Time periods of inactivity may be established by organizations and include time periods by type of network access or for specific network accesses.

Risk Assessment