SC-43 has two parts. First, establish usage restrictions and implementation guidelines for the system components you name. Second, authorize, monitor and control the use of those components.
NIST says it applies to all components, including mobile code, mobile devices, wireless access, and peripherals such as copiers, printers and scanners. The basis is the damage a component could do to the system. 800-53 binds federal systems and their contractors. Everyone else can use it as a checklist for acceptable use rules.
What it means in practice
Pick the component types that matter in your environment, write the rule for each, and be able to show how the rule is enforced. A rule that nobody can check is not a control.
Evidence to collect
- An acceptable use or component usage policy listing the types covered.
- Approval records for exceptions.
- Logs or console reports showing monitoring, such as mobile device management inventory or browser extension reports.
Common gaps
Printers and scanners on the network with default settings. Browser extensions and scripts allowed without review. Rules written, but no monitoring.
How to implement it
Start with a table: component type, rule, who approves, how you monitor. Four columns is enough.
Quick check
Does SC-43 stop at laptops and phones?
No. NIST lists mobile code, wireless access and peripherals such as printers and scanners as well.
