NIST Special Publication 800-171 Revision 2
Date Published: January 28th, 2021
Withdrawn on May 14, 2024. Superseded by SP 800-171 Rev. 3
Author(s): Ron Ross (NIST), Victoria Pillitteri (NIST), Kelley Dempsey (NIST), Mark Riddle (NARA), Gary Guissanie (IDA)
Note: A Class Deviation is in effect as of May 2, 2024 (DEVIATION 2024O0013). The deviation clause requires contractors, who are subject to 252.204-7012, to comply with National Institute of Standards and Technology (NIST) Special Publication (SP) 800-171 Revision 2, instead of the version of NIST SP 800-171 in effect at the time the solicitation is issued or as authorized by the contracting officer. Click Here
AC-3.1.21 Limit use of portable storage devices on external systems.
Control Family: Access Control
Control Type: Derived
SPRS Value: 1
SPRS Supplemental Guidance:
N/A
CMMC Level(s):
AC.L2-3.1.14
Top Ten Failed Requirement:
No
Referenced in:
DFARS 252.204-7012
Derived From: NIST SP 800-53r4
AC-20(2)
NIST Supplemental Guidance:
N/A
Discussion:
Limits on the use of organization-controlled portable storage devices in external systems include complete prohibition of the use of such devices or restrictions on how the devices may be used and under what conditions the devices may be used. Note that while “external” typically refers to outside of the organization’s direct supervision and authority, that is not always the case. Regarding the protection of CUI across an organization, the organization may have systems that process CUI and others that do not. Among the systems that process CUI there are likely access restrictions for CUI that apply between systems. Therefore, from the perspective of a given system, other systems within the organization may be considered “external" to that system.
Upon assessment, assessors must determine if-
3.1.21[a] the use of portable storage devices containing CUI on external systems is
identified and documented.
3.1.21[b] limits on the use of portable storage devices containing CUI on external
systems are defined.
3.1.21[c] the use of portable storage devices containing CUI on external systems is
limited as defined.
Assessors are instructed to-
Examine: [SELECT FROM: Access control policy; procedures addressing the use of external systems; system security plan; system configuration settings and associated documentation; system connection or processing agreements; account management documents; other relevant documents or records].
Interview: [SELECT FROM: Personnel with responsibilities for restricting or prohibiting use of organization-controlled storage devices on external systems; system or network administrators; personnel with information security responsibilities].
Test: [SELECT FROM: Mechanisms implementing restrictions on use of portable storage devices]
Potential Solutions Based on Staffing
1-10 FTE |
10-49 FTE |
50-249 FTE |
250-999 FTE |
1000+ FTE |
|---|---|---|---|---|
| WatchGuard Firebox UTM | WatchGuard Firebox UTM | WatchGuard Firebox UTM | Multiple Options | Multiple Options |
| Netwrix Auditor | Netwrix Auditor | Netwrix Auditor | Netwrix Auditor | Netwrix Auditor |
| Microsoft Intune | Microsoft Intune | Microsoft Intune | Microsoft Intune | Microsoft Intune |
| DISA STIGs | DISA STIGs | Tripwire Enterprise | Tripwire Enterprise | Tripwire Enterprise |
| CIS Benchmarks | CIS Benchmarks | DISA STIGs | DISA STIGs | DISA STIGs |
| CIS SecureSuite | CIS SecureSuite | CIS Benchmarks | CIS Benchmarks | CIS Benchmarks |
| CIS SecureSuite | CIS SecureSuite | CIS SecureSuite |