Assessment Objective

Determine if:

• the use of the following functions is prohibited or restricted: [Assignment: functions].
• the use of the following ports is prohibited or restricted: [Assignment: ports].
• the use of the following protocols is prohibited or restricted: [Assignment: protocols].
• the use of the following connections is prohibited or restricted: [Assignment: connections].
• the use of the following services is prohibited or restricted: [Assignment: services].
• the system is reviewed [Assignment: frequency] to identify unnecessary or nonsecure functions, ports, protocols, connections, and services.
• unnecessary or nonsecure functions, ports, protocols, connections, and services are disabled or removed.
• the system is configured to provide only mission-essential capabilities.

Assessment Methods

Examine

• configuration management policy and procedures
• procedures for least functionality in the system
• configuration management plan
• system design documentation
• system configuration settings
• system component inventory
• common secure configuration checklists
• documented reviews of functions, ports, protocols, and services
• change control records
• system audit records
• system security plan
• other relevant documents or records

Interview

• personnel with configuration management responsibilities
• personnel with responsibilities for reviewing functions, ports, protocols, and services
• personnel with information security responsibilities
• system developers
• system administrators

Test

• processes for prohibiting or restricting functions, ports, protocols, and services
• processes for reviewing or disabling functions, ports, protocols, and services
• mechanisms for implementing the review and disabling of functions, ports, protocols, and services
• mechanisms for implementing restrictions on or the prohibition of functions, ports, protocols, and services

Linked Issues

• NIST -

  https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final