| name | AC-19(4)_restrictions-for-classified-information |
| description | Prohibit the use of unclassified mobile devices in facilities containing systems processing, storing, or transmitting classified information unless... |
| category | authorization |
| version | 5.2.0 |
| author | cyberstrike-official |
| tags | ["nist","sp800-53","rev5","ac-19-4","ac","enhancement"] |
| tech_stack | ["aws","azure","gcp","linux","windows"] |
| cwe_ids | ["CWE-284"] |
| chains_with | ["CM-8","IR-4"] |
| prerequisites | ["AC-19"] |
| severity_boost | {"CM-8":"Chain with CM-8 for comprehensive security coverage","IR-4":"Chain with IR-4 for comprehensive security coverage"} |
AC-19(4) Restrictions for Classified Information
Enhancement of: AC-19
High-Level Description
Family: Access Control (AC)
Framework: NIST SP 800-53 Rev 5
None.
What to Check
How to Test
Step 1: Review Documentation
Examine the System Security Plan (SSP) and related artifacts for AC-19(4) 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 IAM policies and access controls | cloud_audit_iam_policies |
| hackbrowser-mcp | Test web application access controls | browser_auth_test |
Remediation Guide
Control Statement
Prohibit the use of unclassified mobile devices in facilities containing systems processing, storing, or transmitting classified information unless specifically permitted by the authorizing official; and
Enforce the following restrictions on individuals permitted by the authorizing official to use unclassified mobile devices in facilities containing systems processing, storing, or transmitting classified information:
Connection of unclassified mobile devices to classified systems is prohibited;
Connection of unclassified mobile devices to unclassified systems requires approval from the authorizing official;
Use of internal or external modems or wireless interfaces within the unclassified mobile devices is prohibited; and
Unclassified mobile devices and the information stored on those devices are subject to random reviews and inspections by [organization-defined] , and if classified information is found, the incident handling policy is followed.
Restrict the connection of classified mobile devices to classified systems in accordance with [organization-defined].
