SC-10_network-disconnect

SC-10 Network Disconnect

High-Level Description

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

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

What to Check

• Verify SC-10 Network Disconnect is documented in SSP
• Confirm control is operating effectively
• Review evidence of continuous monitoring for SC-10

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for SC-10 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

Terminate the network connection associated with a communications session at the end of the session or after [organization-defined] of inactivity.

Implementation Guidance

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

Risk Assessment

CWE Categories

References

• NIST SP 800-53 Rev 5 - SC-10
• 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 (AC-17, SC-23) reviewed