# MP-3_media-marking

> Mark system media indicating the distribution limitations, handling caveats, and applicable security markings (if any) of the information;

- Skill: `cyberstrikeus/mp-3-media-marking` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/mp-3-media-marking`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/mp-3-media-marking/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/mp-3-media-marking

---


# MP-3 Media Marking

## High-Level Description

**Family:** Media Protection (MP)
**Framework:** NIST SP 800-53 Rev 5

Security marking refers to the application or use of human-readable security attributes. Digital media includes diskettes, magnetic tapes, external or removable hard disk drives (e.g., solid state, magnetic), flash drives, compact discs, and digital versatile discs. Non-digital media includes paper and microfilm. Controlled unclassified information is defined by the National Archives and Records Administration along with the appropriate safeguarding and dissemination requirements for such information and is codified in [32 CFR 2002](#91f992fb-f668-4c91-a50f-0f05b95ccee3) . Security markings are generally not required for media that contains information determined by organizations to be in the public domain or to be publicly releasable. Some organizations may require markings for public information indicating that the information is publicly releasable. System media marking reflects applicable laws, executive orders, directives, policies, regulations, standards, and guidelines.

## What to Check

- [ ] Verify MP-3 Media Marking is documented in SSP
- [ ] Validate all 2 control requirements are implemented
- [ ] Confirm control is operating effectively
- [ ] Review evidence of continuous monitoring for MP-3

## How to Test

### Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for MP-3 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 |
| ------------- | --------------------------------- | ----- |
| Manual Review | Documentation and interview-based | N/A   |

## Remediation Guide

### Control Statement

Mark system media indicating the distribution limitations, handling caveats, and applicable security markings (if any) of the information; and
Exempt [organization-defined] from marking if the media remain within [organization-defined].

### Implementation Guidance

Security marking refers to the application or use of human-readable security attributes. Digital media includes diskettes, magnetic tapes, external or removable hard disk drives (e.g., solid state, magnetic), flash drives, compact discs, and digital versatile discs. Non-digital media includes paper and microfilm. Controlled unclassified information is defined by the National Archives and Records Administration along with the appropriate safeguarding and dissemination requirements for such information and is codified in [32 CFR 2002](#91f992fb-f668-4c91-a50f-0f05b95ccee3) . Security markings are generally not required for media that contains information determined by organizations to be in the public domain or to be publicly releasable. Some organizations may require markings for public information indicating that the information is publicly releasable. System media marking reflects applicable laws, executive orders, directives, policies, regulations, standards, and guidelines.

## Risk Assessment

| Finding                            | Severity | Impact                      |
| ---------------------------------- | -------- | --------------------------- |
| MP-3 Media Marking not implemented | Medium   | Media Protection            |
| MP-3 partially implemented         | Low      | Incomplete Media Protection |

## CWE Categories

| CWE ID | Title                 |
| ------ | --------------------- |
| N/A    | No direct CWE mapping |

## References

- [NIST SP 800-53 Rev 5 - MP-3](https://csrc.nist.gov/projects/cprt/catalog#/cprt/framework/version/SP_800_53_5_1_1/home?element=mp-3)
- [NIST SP 800-53A Rev 5 (Assessment Procedures)](https://csrc.nist.gov/pubs/sp/800/53/a/r5/final)
- [NIST SP 800-53 Rev 5 Full Catalog](https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final)

## Checklist

- [ ] Control documented in SSP
- [ ] Implementation evidence collected
- [ ] Operating effectiveness validated
- [ ] Continuous monitoring in place
- [ ] Related controls (AC-16, CP-9, MP-5, PE-22, SI-12) reviewed