AC-19(4)_restrictions-for-classified-information
DevOps & SecurityAC-19(4)_restrictions-for-classified-information is an Agent Skill for devops & security published in the CyberStrikeus/CyberStrike repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.
Prohibit the use of unclassified mobile devices in facilities containing systems processing, storing, or transmitting classified information unless...
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Inspect the Agent Skill at https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/NIST/SP800-53_rev5/AC_access-control/AC-19(4)_restrictions-for-classified-information/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/ac-19-4-restrictions-for-classified-information, but wait for my approval before writing files or running scripts.
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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
- Verify AC-19(4) Restrictions for Classified Information is documented in SSP
- Validate all 5 control requirements are implemented
- Confirm control is operating effectively
- Review evidence of continuous monitoring for AC-19(4)
- Verify enhancement builds upon base control AC-19
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].
Implementation Guidance
None.
Risk Assessment
| Finding | Severity | Impact |
|---|---|---|
| AC-19(4) Restrictions for Classified Information not implemented | High | Access Control |
| AC-19(4) partially implemented | Medium | Incomplete Access Control |
CWE Categories
| CWE ID | Title |
|---|---|
| CWE-284 | Improper Access Control |
References
- NIST SP 800-53 Rev 5 - AC-19(4)
- 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 (CM-8, IR-4) reviewed