3.4.5

Requirement

Define, document, approve, and enforce physical and logical access restrictions associated with changes to the system.

Discussion

Changes to the hardware, software, or firmware components of the system or the operational procedures related to the system can have potentially significant effects on the security of the system. Therefore, organizations permit only qualified and authorized individuals to access the system for the purpose of initiating changes. Access restrictions include physical and logical access controls, software libraries, workflow automation, media libraries, abstract layers (i.e., changes implemented into external interfaces rather than directly into the system), and change windows (i.e., changes occur only during specified times).

NIST 800-171A r3 Assessment Guidance

Examine

[SELECT FROM: configuration management policy and procedures; procedures for access restrictions for system changes; configuration management plan; system design documentation; system architecture; system configuration settings; logical access approvals; physical access approvals; access credentials; change control records; system audit records; system security plan; other relevant documents or records]
Interview

[SELECT FROM: processes for managing access restrictions for system changes; mechanisms for supporting, implementing, or enforcing access restrictions associated with system changes]
Test

[SELECT FROM: personnel with logical access control responsibilities; personnel with physical access control responsibilities; personnel with information security responsibilities; system administrators]

ID	Assessment Objectives
A.03.04.05[01]	physical access restrictions associated with changes to the system are defined and documented.
A.03.04.05[02]	physical access restrictions associated with changes to the system are approved.
A.03.04.05[03]	physical access restrictions associated with changes to the system are enforced.
A.03.04.05[04]	logical access restrictions associated with changes to the system are defined and documented.
A.03.04.05[05]	logical access restrictions associated with changes to the system are approved.
A.03.04.05[06]	logical access restrictions associated with changes to the system are enforced.

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