AC-19 Access Control for Mobile Devices

Baselines

Guidance

A mobile device is a computing device that has a small form factor such that it can easily be carried by a single individual; is designed to operate without a physical connection; possesses local, non-removable or removable data storage; and includes a self-contained power source. Mobile device functionality may also include voice communication capabilities, on-board sensors that allow the device to capture information, and/or built-in features for synchronizing local data with remote locations. Examples include smart phones and tablets. Mobile devices are typically associated with a single individual. The processing, storage, and transmission capability of the mobile device may be comparable to or merely a subset of notebook/desktop systems, depending on the nature and intended purpose of the device. Protection and control of mobile devices is behavior or policy-based and requires users to take physical action to protect and control such devices when outside of controlled areas. Controlled areas are spaces for which organizations provide physical or procedural controls to meet the requirements established for protecting information and systems.

Due to the large variety of mobile devices with different characteristics and capabilities, organizational restrictions may vary for the different classes or types of such devices. Usage restrictions and specific implementation guidance for mobile devices include configuration management, device identification and authentication, implementation of mandatory protective software, scanning devices for malicious code, updating virus protection software, scanning for critical software updates and patches, conducting primary operating system (and possibly other resident software) integrity checks, and disabling unnecessary hardware.

Usage restrictions and authorization to connect may vary among organizational systems. For example, the organization may authorize the connection of mobile devices to its network and impose a set of usage restrictions, while a system owner may withhold authorization for mobile device connection to specific applications or impose additional usage restrictions before allowing mobile device connections to a system. Adequate security for mobile devices goes beyond the requirements specified in AC-19 . Many safeguards for mobile devices are reflected in other controls. AC-20 addresses mobile devices that are not organization-controlled.

References 2

• SP 800-114 Souppaya MP, Scarfone KA (2016) User's Guide to Telework and Bring Your Own Device (BYOD) Security. (National Institute of Standards and Technology, Gaithersburg, MD), NIST Special Publication (SP) 800-114, Rev. 1.
• SP 800-124 Souppaya MP, Scarfone KA (2013) Guidelines for Managing the Security of Mobile Devices in the Enterprise. (National Institute of Standards and Technology, Gaithersburg, MD), NIST Special Publication (SP) 800-124, Rev. 1.

Control Enhancements 5

• AC-19(01) Use of Writable and Portable Storage Devices
• AC-19(02) Use of Personally Owned Portable Storage Devices
• AC-19(03) Use of Portable Storage Devices with No Identifiable Owner
• AC-19(04) Restrictions for Classified Information L M H P
• AC-19(05) Full Device or Container-based Encryption L M H P

Related controls 22

• AC-03 Access Enforcement L M H P
• AC-04 Information Flow Enforcement L M H P
• AC-07 Unsuccessful Logon Attempts L M H P
• AC-11 Device Lock L M H P
• AC-17 Remote Access L M H P
• AC-18 Wireless Access L M H P
• AC-20 Use of External Systems L M H P
• CA-09 Internal System Connections L M H P
• CM-02 Baseline Configuration L M H P
• CM-06 Configuration Settings L M H P
• IA-02 Identification and Authentication (Organizational Users) L M H P
• IA-03 Device Identification and Authentication L M H P
• MP-02 Media Access L M H P
• MP-04 Media Storage L M H P
• MP-05 Media Transport L M H P
• MP-07 Media Use L M H P
• PL-04 Rules of Behavior L M H P
• SC-07 Boundary Protection L M H P
• SC-34 Non-modifiable Executable Programs L M H P
• SC-43 Usage Restrictions L M H P
• SI-03 Malicious Code Protection L M H P
• SI-04 System Monitoring L M H P