| name | SC-7(26)_classified-national-security-system-connections |
| description | Prohibit the direct connection of a classified national security system to an external network without the use of [organization-defined]. |
| category | configuration |
| version | 5.2.0 |
| author | cyberstrike-official |
| tags | ["nist","sp800-53","rev5","sc-7-26","sc","enhancement"] |
| tech_stack | ["aws","azure","gcp","linux","windows","network"] |
| cwe_ids | ["CWE-311"] |
| chains_with | [] |
| prerequisites | ["SC-7"] |
| severity_boost | {} |
SC-7(26) Classified National Security System Connections
Enhancement of: SC-7
High-Level Description
Family: System and Communications Protection (SC)
Framework: NIST SP 800-53 Rev 5
A direct connection is a dedicated physical or virtual connection between two or more systems. Organizations typically do not have complete control over external networks, including the Internet. Boundary protection devices (e.g., firewalls, gateways, and routers) mediate communications and information flows between classified national security systems and external networks. In addition, approved boundary protection devices (typically managed interface or cross-domain systems) provide information flow enforcement from systems to external networks.
What to Check
How to Test
Step 1: Review Documentation
Examine the System Security Plan (SSP) and related artifacts for SC-7(26) 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
| Tool | Purpose | Usage |
|---|
| cloud-audit-mcp | Check encryption and network controls | cloud_audit_encryption |
| nmap | Network scanning | nmap -sV --script ssl-enum-ciphers |
Remediation Guide
Control Statement
Prohibit the direct connection of a classified national security system to an external network without the use of [organization-defined].
