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Forescout must be configured to apply dynamic ACLs that restrict the use of ports when non-entity endpoints are connected using MAC Authentication Bypass (MAB). This is required for compliance with C2C Step 4.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-233327FORE-NC-000190SV-233327r1113800_ruleCCI-001958medium
Description
MAB is only one way of connecting non-entity endpoints, and can be defeated by spoofing the MAC address of an assumed authorized device. By adding the device to the MAR, the device can then gain access to the network. NPE devices that can support PKI or an allowed authentication type must use PKI. MAB may be used for NPE that cannot support an approved device authentication. Non-entity endpoints include Internet of Things (IoT) devices, VoIP phone, and printer.
STIGDate
Forescout Network Access Control Security Technical Implementation Guide2025-06-12

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 4 hops (5) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

IAC-01.2Authenticate, Authorize and Audit (AAA)
1.00
IAC-02Identification & Authentication for Organizational Users
1.00
IAC-03Identification & Authentication for Non-Organizational Users
1.00
IAC-04Identification & Authentication for Devices
1.00
IAC-05Identification & Authentication for Third-Party Technology Assets, Applications and/or Services (TAAS)
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (31) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-17(10)Authenticate Remote Commands
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(11)Usage Conditions
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-7Unsuccessful Logon Attempts
1.00
CM-6Configuration Settings
1.00
CM-7Least Functionality
1.00
CM-7(9)Prohibiting The Use of Unauthorized Hardware
1.00
IA-11Re-authentication
1.00

+21 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.5.1
1.00
3.5.2
1.00
CCI1 mapping
CCI-001958
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (3) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

PR.AA-01
1.00
PR.AA-03
1.00
PR.AA-05
0.50

Who does this work

7 NICE work roles and 5 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-233327r1113800_chk)

If DOD is not at C2C Step 4 or higher, this is not a finding. Verify Forescout applies dynamic ACLs (or VLAN restrictions) that restrict the use of ports when nonentity endpoints are connected using MAC Address Repository (MAR). If the NAC does not apply dynamic ACLs (or VLAN restrictions) that restrict the use of ports when nonentity endpoints are connected using MAR, this is a finding.

Fix Text (F-36487r1113799_fix)

Use the Forescout Administrator UI to configure the policy which identifies nonentity endpoints to complete a control action when a device is added to the MAR. 1. Log on to Forescout UI. 2. In the Policy tab, locate the Authentication and Authorization policy set. 3. Select a policy that identifies nonentity endpoints. Highlight the policy, then select "Edit". 4. From the Sub-Rules section, ensure that when a device is added to the MAR, the policy also applies one of the following actions: -Access Port ACL. -Endpoint Address ACL. -WLAN Role. -VLAN Change.