Decide and limit how outside systems and services connect to yours.
What it actually means
Verify and control or limit connections to and use of external systems — partner networks, personal devices, third-party cloud services. Define which external systems may connect and how, and restrict the rest. This is also a Level 1 (FCI) requirement.
Pass or fail — an assessor needs a "yes" to each
- Have you defined which external systems may connect to or be used with your systems?
- Are unapproved external connections restricted?
What to have ready
- Policy on external-system connections
- Configuration restricting external connections (tenant rules, firewall, conditional access)
Where teams trip up
- Unmanaged personal devices freely accessing CUI systems
- No stance on third-party cloud usage
Also a Level 1 (FCI) requirement.
See where this control puts your score
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More in Access Control (3.1)
3.1.1 — Limit who (and what) can get in3.1.2 — Limit what users can do3.1.3 — Control the flow of CUI3.1.4 — Separate duties3.1.5 — Least privilege (especially for admins)3.1.6 — Use non-privileged accounts for routine work3.1.7 — Restrict and log privileged functions3.1.8 — Limit failed logons3.1.9 — Show privacy and security notices3.1.10 — Lock idle screens3.1.11 — End sessions automatically3.1.12 — Monitor and control remote access3.1.13 — Encrypt remote access sessions3.1.14 — Funnel remote access through managed points3.1.15 — Authorize privileged remote actions3.1.16 — Authorize wireless access first3.1.17 — Protect wireless with authentication + encryption3.1.18 — Control mobile device connections3.1.19 — Encrypt CUI on mobile devices3.1.21 — Limit portable storage on external systems3.1.22 — Control what goes on public systems