NIST 800-171 3.8.2 (MP.L2-3.8.2): Media Access
Limit access to CUI on system media to authorized users.
CMMC Level 2 practice MP.L2-3.8.2
What 3.8.2 means in practice
Only authorized users can get to CUI on media, either because the physical media is controlled (locked storage, check-out logs) or because it is encrypted so only authorized people can read it. Where 3.8.1 is about keeping the media itself safe, this requirement is about who can read what is on it.
SPRS points and the CMMC POA&M
- CMMC Level 2 practice
- MP.L2-3.8.2
- SPRS points
- 3 points. When it is not met, the DoD Assessment Methodology subtracts 3 from the score of 110.
- CMMC POA&M
- Not allowed. It is worth 3 points, and 32 CFR 170.21(a)(2)(ii) admits only requirements worth 1 point, with one exception: 3.13.11 when encryption is used but not FIPS validated.
Sources: NIST SP 800-171 DoD Assessment Methodology, version 1.2.1 (June 24, 2020), Annex A; 32 CFR 170.21, Plan of Action and Milestones requirements.
What an assessor checks for 3.8.2
NIST SP 800-171A gives one determination statement for 3.8.2.
Determine if access to CUI on system media is limited to authorized users.
NIST SP 800-171A (June 2018), assessment objectives for 3.8.2
Evidence that shows 3.8.2 is met
- Access lists for media storage areas.
- Media check-out and return logs.
- Encryption of removable media, with keys held by authorized users.
How PolicyCortex gathers the evidence
No PolicyCortex collector reads the evidence for 3.8.2. Your team provides the evidence listed above.
Meet the requirement once. Keep the evidence current.
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