What this control covers
This control restricts access to Controlled Unclassified Information (CUI) on system media to authorized personnel or roles. It involves physical control of media, including conducting inventories and ensuring secure check-out and return procedures. For digital media, access is further restricted through cryptographic means to prevent unauthorized access to CUI. This control supports the Media Access Management capability within the Media Protection (3.8) family.
Why it matters
Risk is the language an executive team understands; this control connects technical reality to board-level decisions and budget allocation.
How to implement
AWS
Codify the policy intent as SCPs, AWS Config conformance packs, and Security Hub standards so the cloud enforces what the document says.
Azure
Codify in Azure Policy initiatives (built-in regulatory compliance for CIS, ISO 27001, SOC 2, HIPAA) and assign at management-group level.
GCP
Use Cloud Identity (or Workspace) as the IdP and IAM for resource access. Grant roles at the lowest scope (project > folder > org) using Workload Identity Federation for CI/CD and service accounts for workloads — never download service-account keys when avoidable. Enable Policy Intelligence recommenders to right-size privileges and detect dormant identities.
Google Workspace
Enforce 2-Step Verification (preferably hardware keys for admins) for the entire org, set session length to ≤ 12 hours, and disable less-secure-app access. Use Context-Aware Access levels to restrict admin sign-in by IP/device posture. Provision and de-provision users via SCIM from your HRIS so leavers lose access on day one.
GitHub
Require SSO + SCIM from your IdP on the organisation; enforce 2FA org-wide and use fine-grained PATs (or, better, GitHub Apps) instead of classic tokens. Restrict outside collaborators, require signed commits on protected branches, and use OIDC from Actions to short-lived AWS/GCP/Azure credentials rather than stored secrets.
Zoho Mail
Make two-factor authentication mandatory for all users (TOTP, OneAuth, or YubiKey) in Admin Console → Security. Configure SAML SSO against your IdP and disable password-based logins for admins. Use role-based privileges (Admin / Spam Moderator / Mail Account Admin) and review the Login history report monthly for anomalies.
On-premises
Maintain a policy library with a documented review cadence (annual minimum); store in your GRC tool with attestation tracking. Map each policy to controls so an audit pull cites the exact policy clause.
Evidence to collect
identity_scan— See the iCompaas Evidence library for the canonical source for this evidence type.infra_scan— See the iCompaas Evidence library for the canonical source for this evidence type.
Identity analytics (Okta, SailPoint, Access Analyzer) demonstrates least-privilege. Focus: Media Access.
Quick checklist
- Access — Management / Cui
- Information — Management / Cui
- Protection — Management / Cui
- Authorized — Management / Cui
- System — Management / Cui
- Media — Management / Cui
Related articles on this site
- NIST 800-171 3.1.1 Limit information system access to authorized users, processes acting on behalf of authorized users, or devices (including other information systems).
- NIST 800-171 3.8.2 Limit access to CUI on system media to authorized users
- NIST 800-171 3.8.5 Control access to media containing CUI and maintain accountability for media during transport outside of controlled areas.
- CMMC 2.0 AC.1.001 Limit information system access to authorized users, processes acting on behalf of authorized users, or devices (including other information systems)