AC-19(4)

AC-19(4): Restrictions for Classified Information

(a): Prohibit the use of unclassified mobile devices in facilities containing systems processing, storing, or transmitting classified information unless specifically permitted by the authorizing official; and

(b): Enforce the following restrictions on individuals permitted by the authorizing official to use unclassified mobile devices in facilities containing systems processing, storing, or transmitting classified information:
- (1): Connection of unclassified mobile devices to classified systems is prohibited;
- (2): Connection of unclassified mobile devices to unclassified systems requires approval from the authorizing official;
- (3): Use of internal or external modems or wireless interfaces within the unclassified mobile devices is prohibited; and
- (4): Unclassified mobile devices and the information stored on those devices are subject to random reviews and inspections by [security officials responsible for the review and inspection of unclassified mobile devices and the information stored on those devices are defined;] , and if classified information is found, the incident handling policy is followed.

(c): Restrict the connection of classified mobile devices to classified systems in accordance with [security policies restricting the connection of classified mobile devices to classified systems are defined;].

None.

Overlays
Classified, Int-A, Int-B, Int-C

CSF Categories
None

The controls below (if any) were marked by NIST as being related to AC-19(4).

Control	Description
CM-8	a: Develop and document an inventory of system components that: 1: Accurately reflects the system; 2: Includes all components within the system; 3: Does not include duplicate accounting of components or components assigned to any other system; 4: Is at the level of granularity deemed necessary for tracking and reporting; and 5: Includes the following information to achieve system component accountability: [information deemed necessary to achieve effective system component accountability is defined;] ; and b: Review and update the system component inventory [frequency at which to review and update the system component inventory is defined;].
IR-4	a: Implement an incident handling capability for incidents that is consistent with the incident response plan and includes preparation, detection and analysis, containment, eradication, and recovery; b: Coordinate incident handling activities with contingency planning activities; c: Incorporate lessons learned from ongoing incident handling activities into incident response procedures, training, and testing, and implement the resulting changes accordingly; and d: Ensure the rigor, intensity, scope, and results of incident handling activities are comparable and predictable across the organization.

Control

Description

b: Review and update the system component inventory [frequency at which to review and update the system component inventory is defined;].

a: Implement an incident handling capability for incidents that is consistent with the incident response plan and includes preparation, detection and analysis, containment, eradication, and recovery;

b: Coordinate incident handling activities with contingency planning activities;

c: Incorporate lessons learned from ongoing incident handling activities into incident response procedures, training, and testing, and implement the resulting changes accordingly; and

d: Ensure the rigor, intensity, scope, and results of incident handling activities are comparable and predictable across the organization.

The controls below (if any) add on to the requirements of AC-19(4).

Control	Description
No controls

The CCIs below are tied to AC-19(4).

CCI	Definition
CCI-001330	Prohibit the use of unclassified mobile devices in facilities containing systems processing, storing, or transmitting classified information unless specifically permitted by the authorizing official.
CCI-001331	Prohibit the connection of unclassified mobile devices to classified systems.
CCI-001332	Connection of unclassified mobile devices to unclassified systems requires approval from the authorizing official.
CCI-001333	Use of internal or external modems or wireless interfaces within the unclassified mobile devices is prohibited.
CCI-001334	Require unclassified mobile devices used in facilities containing systems processing, storing, or transmitting classified information and the information stored on those devices be subject to random reviews and inspections by organization-defined security officials.
CCI-001335	Defines security officials to perform reviews and inspections of unclassified mobile devices in facilities containing systems processing, storing, or transmitting classified information.
CCI-001458	If classified information is found on mobile devices, the incident handling policy is to be followed.
CCI-002327	Defines the security policies which restrict the connection of classified mobile devices to classified systems.
CCI-002328	Restrict the connection of classified mobile devices to classified systems in accordance with organization-defined security policies.