SA-8(5)

Requirement

Implement the security design principle of efficiently mediated access in [Assignment: organization-defined systems or system components].

Discussion

The principle of efficiently mediated access states that policy enforcement mechanisms utilize the least common mechanism available while satisfying stakeholder requirements within expressed constraints. The mediation of access to system resources (i.e., CPU, memory, devices, communication ports, services, infrastructure, data, and information) is often the predominant security function of secure systems. It also enables the realization of protections for the capability provided to stakeholders by the system. Mediation of resource access can result in performance bottlenecks if the system is not designed correctly. For example, by using hardware mechanisms, efficiently mediated access can be achieved. Once access to a low-level resource such as memory has been obtained, hardware protection mechanisms can ensure that out-of-bounds access does not occur.

Title

Security and Privacy Engineering Principles | Efficiently Mediated Access
Family

System and Services Acquisition
NIST 800-53B Baseline(s)

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: System and services acquisition policy; procedures addressing the security design principle of efficiently mediated access used in the specification, design, development, implementation, and modification of the system; system design documentation; security and privacy requirements and specifications for the system; system security and privacy architecture; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with acquisition/contracting responsibilities; organizational personnel with the responsibility for determining system security and privacy requirements; organizational personnel with system specification, design, development, implementation, and modification responsibilities; system developers; organizational personnel with information security responsibilities].

Test

[SELECT FROM: Organizational processes for applying the security design principle of efficiently mediated access in system specification, design, development, implementation, and modification; mechanisms supporting the application of the security design principle of efficiently mediated access in system specification, design, development, implementation, and modification].

ID	Assessment Objectives
SA-08(05)	<SA-08(05)_ODP systems or system components> implement the security design principle of efficiently mediated access.

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