SA-8(31)

Requirement

Implement the security design principle of secure system modification in [Assignment: organization-defined systems or system components].

Discussion

The principle of secure system modification states that system modification maintains system security with respect to the security requirements and risk tolerance of stakeholders. Upgrades or modifications to systems can transform secure systems into systems that are not secure. The procedures for system modification ensure that if the system is to maintain its trustworthiness, the same rigor that was applied to its initial development is applied to any system changes. Because modifications can affect the ability of the system to maintain its secure state, a careful security analysis of the modification is needed prior to its implementation and deployment. This principle parallels the principle of secure evolvability.

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: System and services acquisition policy; configuration management policy and procedures; procedures addressing the security design principle of secure system modification used in the specification, design, development, implementation, and modification of the system; system design documentation; system configuration settings and associated documentation; change control records; 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 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 secure system modification in system specification, design, development, implementation, and modification; mechanisms supporting the application of the security design principle of secure system modification in system specification, design, development, implementation, and modification; mechanisms that enforce security policies; organizational processes for managing change configuration; mechanisms supporting configuration control].

ID	Assessment Objectives
SA-08(31)	<SA-08(31)_ODP systems or system components> implement the security design principle of secure system modification.

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