Forescout Network Access Control Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-NET-000015-NAC-000020
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SRG-NET-000015-NAC-000030
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Endpoint policy assessment must proceed after the endpoint attempting access has been identified using an approved identification method such as IP address. This is required for compliance with C2C Step 2.
Automated policy assessments must reflect the organization's current security policy so entry control decisions will happen only where remote endpoints meet the organization's security requirements...Rule High Severity -
SRG-NET-000015-NAC-000040
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SRG-NET-000015-NAC-000060
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If a device requesting access fails Forescout policy assessment, Forescout must communicate with other components and the switch to either terminate the session or isolate the device from the trusted network for remediation. This is required for compliance with C2C Step 3.
Endpoints with identified security flaws and weaknesses endanger the network and other devices on it. Isolation or termination prevents traffic from flowing with traffic from endpoints that have be...Rule High Severity -
SRG-NET-000015-NAC-000070
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SRG-NET-000015-NAC-000080
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Forescout must be configured so that all client machines are assessed by Forescout with exceptions that are allowed to bypass Forescout based on account or account type, as approved by the information system security manager (ISSM) and documented in the System Security Plan (SSP). This is required for compliance with C2C Step 1.
The NAC gateway provides the policy enforcement allowing or denying the endpoint to the network. Unauthorized endpoints that bypass this control present a risk to the organization's data and networ...Rule High Severity -
SRG-NET-000015-NAC-000090
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SRG-NET-000015-NAC-000110
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When devices fail the policy assessment, Forescout must create a record with sufficient detail suitable for forwarding to a remediation server for automated remediation or sending to the user for manual remediation. This is required for compliance with C2C Step 3.
Notifications sent to the user and/or network administrator informing them of remediation requirements will ensure that action is taken.Rule Medium Severity -
SRG-NET-000015-NAC-000120
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Forescout must place client machines on a blacklist or terminate network communications on devices when critical security issues are found that put the network at risk. This is required for compliance with C2C Step 4.
Devices that are found to have critical security issues place the network at risk if they are allowed to continue communications. Policy actions should be in place to terminate or restrict network ...Rule High Severity -
SRG-NET-000015-NAC-000130
Group -
SRG-NET-000321-NAC-001210
Group -
Forescout must enforce the revocation of endpoint access authorizations when devices are removed from an authorization group. This is required for compliance with C2C Step 4.
Ensuring the conditions that are configured in policy have proper time limits set to reflect changes will allow for proper access. This will help to validate that authorized individuals have proper...Rule Medium Severity -
SRG-NET-000322-NAC-001220
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SRG-NET-000322-NAC-001230
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Forescout must deny or restrict access for endpoints that fail critical endpoint security checks. This is required for compliance with C2C Step 4.
Devices that do not meet minimum-security configuration requirements pose a risk to the DOD network and information assets. Endpoint devices must be disconnected or given limited access as designa...Rule Medium Severity -
SRG-NET-000334-NAC-001350
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Forescout must off-load log records onto a different system. This is required for compliance with C2C Step 1.
Having a separate, secure location for log records is essential to the preservation of logs as required by policy.Rule Medium Severity -
SRG-NET-000335-NAC-001360
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Forescout must generate a critical alert to be sent to the Information System Security Officer (ISSO) and Systems Administrator (SA) (at a minimum) in the event of an audit processing failure. This is required for compliance with C2C Step 1.
Ensuring that a security solution alerts in the event of misconfiguration or error is imperative to ensuring that proper auditing is being conducted. Having the ability to immediately notify an adm...Rule Medium Severity -
SRG-NET-000343-NAC-001460
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SRG-NET-000343-NAC-001470
Group -
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.
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 ac...Rule Medium Severity -
SRG-NET-000273-NAC-000970
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Forescout must reveal error messages only to the Information System Security Officer (ISSO), Information System Security Manager (ISSM), and System Administrator (SA). This is required for compliance with C2C Step 1.
Ensuring the proper amount of information is provided to the Security Management staff is imperative to ensure role based access control. Only those individuals that need to know about a security e...Rule Medium Severity -
SRG-NET-000088-NAC-000440
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Forescout must configure TCP for the syslog protocol to allow for detection by the central event server if communications is lost. This is required for compliance with C2C Step 1.
It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without this notification, the security personnel may be unaware of an ...Rule Medium Severity -
SRG-NET-000343-NAC-001480
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SRG-NET-000517-NAC-002370
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For TLS connections, Forescout must automatically terminate the session when a client certificate is requested and the client does not have a suitable certificate. This is required for compliance with C2C Step 1.
In accordance with NIST SP 800-52, the TLS server must terminate the connection with a fatal “handshake failure” alert when a client certificate is requested and the client does not have a suitable...Rule Medium Severity -
SRG-NET-000062-NAC-000340
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SRG-NET-000320-NAC-001200
Group -
Communications between Forescout endpoint agent and the switch must transmit access authorization information via a protected path using a cryptographic mechanism. This is required for compliance with C2C Step 1.
Forescout solution assesses the compliance posture of each client and returns an access decision based on configured security policy. The communications associated with this traffic must be protect...Rule Medium Severity -
SRG-NET-000492-NAC-002110
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Forescout must generate a log record when the client machine fails policy assessment because required security software is missing or has been deleted. This is required for compliance with C2C Step 1.
Generating log records with regard to modules and policies is an important part of maintaining proper cyber hygiene. Keeping and maintaining the logs helps to establish, correlate, and investigate ...Rule Medium Severity -
SRG-NET-000336-NAC-001390
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SRG-NET-000512-NAC-002310
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Forescout must perform continuous detection and tracking of endpoint devices attached to the network. This is required for compliance with C2C Step 1.
Continuous scanning capabilities on the NAC provide visibility of devices that are connected to the switch ports. The NAC continuously scans networks and monitors the activity of managed and unmana...Rule Medium Severity -
SRG-NET-000148-NAC-000620
Group -
SRG-NET-000151-NAC-000630
Group -
SRG-NET-000580-NAC-002530
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Forescout must enforce approved access by employing admissions assessment filters that include, at a minimum, device attributes such as type, IP address, resource group, and/or mission conditions as defined in Forescout System Security Plan (SSP). This is required for compliance with C2C Step 4.
Successful authentication must not automatically give an entity access to an asset or security boundary. The lack of authorization-based access control could result in the immediate compromise and ...Rule High Severity -
For endpoints that require automated remediation, Forescout must be configured to logically separate endpoints from the trusted network traffic during remediation. This is required for compliance with C2C Step 4.
Automated and manual procedures for remediation for critical security updates will be managed differently. Continuing to assess and remediate endpoints with risks that could endanger the network co...Rule High Severity -
Forescout must be configured to notify the user before proceeding with remediation of the user's endpoint device when automated remediation is used. This is required for compliance with C2C Step 3.
Connections that bypass established security controls should be allowed only in cases of administrative need. These procedures and use cases must be approved by the Information System Security Mana...Rule Medium Severity -
Forescout appliance must not be configured to implement a DHCP layer 3 method for separation or device authorization. This is required for compliance with C2C Step 2.
Using DHCP, an internal rogue device can still bypass the authentication process, regardless of the policy flow. Older version of the ForeScout may have a setting to support DHCP for NAC authorizat...Rule High Severity -
Forescout must be configured so client machines do not communicate with other network devices in the DMZ or subnet except as needed to perform a client assessment or to identify itself. This is required for compliance with C2C Step 2.
Devices not compliant with DOD secure configuration policies are vulnerable to attack. While endpoints are undergoing NAC authorization assessment, they must communicate only with the NAC. These de...Rule Medium Severity
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