SC-51

Requirement
1. Employ hardware-based, write-protect for [Assignment: organization-defined system firmware components]; and
2. Implement specific procedures for [Assignment: organization-defined authorized individuals] to manually disable hardware write-protect for firmware modifications and re-enable the write-protect prior to returning to operational mode.

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: System and communications protection policy; procedures addressing firmware modifications; system design documentation; system configuration settings and associated documentation; system architecture; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: System/network administrators; organizational personnel with information security responsibilities; organizational personnel installing, configuring, and/or maintaining the system; system developers/integrators].

Test

[SELECT FROM: Organizational processes for modifying system firmware; mechanisms supporting and/or implementing hardware-based write-protection for system firmware].

ID	Assessment Objectives
SC-51a.	hardware-based write-protect for <SC-51_ODP[01] system firmware components> is employed;
SC-51b.[01]	specific procedures are implemented for <SC-51_ODP[02] authorized individuals> to manually disable hardware write-protect for firmware modifications;
SC-51b.[02]	specific procedures are implemented for <SC-51_ODP[02] authorized individuals> to re-enable the write-protect prior to returning to operational mode.

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