Cisco ISE NAC Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The Cisco ISE must send an alert to the system administrator, at a minimum, when endpoints fail the policy assessment checks for organization-defined infractions. This is required for compliance with C2C Step 3.
Failing the Cisco ISE assessment, means that an unauthorized machine has attempted to access the secure network. Without generating log records that are specific to the security and mission needs o...Rule Medium Severity -
SRG-NET-000335-NAC-001360
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The Cisco ISE must generate a critical alert to be sent to the ISSO and SA (at a minimum) in the event of an audit processing failure. 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 an alert, security personnel may be unaware of an impending fai...Rule Medium Severity -
SRG-NET-000335-NAC-001370
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The Cisco ISE must provide an alert to, at a minimum, the SA and ISSO of all audit failure events where the detection and/or prevention function is unable to write events to either local storage or the centralized server. This is required for compliance with C2C Step 1.
Without an alert, security personnel may be unaware of an impending failure of the audit capability and system operation may be adversely affected. Alerts provide organizations with urgent message...Rule Medium Severity -
SRG-NET-000336-NAC-001390
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SRG-NET-000512-NAC-002310
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The Cisco ISE 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 Cisco ISE provide visibility of devices that are connected to the switch ports. The Cisco ISE continuously scans networks and monitors the activity of manage...Rule Medium Severity -
SRG-NET-000148-NAC-000620
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SRG-NET-000343-NAC-001460
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The Cisco ISE must authenticate all endpoint devices before establishing a connection and proceeding with posture assessment. This is required for compliance with C2C Step 4.
Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. However, failure to authenticate an endpoint does not need to result in c...Rule Medium Severity -
SRG-NET-000343-NAC-001470
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The Cisco ISE must be configured to dynamically apply restricted access of endpoints that are granted access using MAC Authentication Bypass (MAB). This is required for compliance with C2C Step 4.
MAB can be defeated by spoofing the MAC address of a valid device. MAB enables port-based access control using the MAC address of the endpoint. A MAB-enabled port can be dynamically enabled or disa...Rule Medium Severity -
SRG-NET-000550-NAC-002470
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SRG-NET-000151-NAC-000630
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Before establishing a local, remote, and/or network connection with any endpoint device, the Cisco ISE must use a bidirectional authentication mechanism configured with a FIPS-validated Advanced Encryption Standard (AES) cipher block algorithm to authenticate with the endpoint device. This is required for compliance with C2C Step 1.
Bidirectional authentication provides stronger safeguards to validate the identity of other devices for connections that are of greater risk. Currently, DoD requires the use of AES for bidirectiona...Rule Medium Severity -
SRG-NET-000512-NAC-002310
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The Cisco ISE must enforce posture status assessment for posture required clients defined in the NAC System Security Plan (SSP). This is required for compliance with C2C Step 3.
Posture assessments can reduce the risk that clients impose on networks by restricting or preventing access of noncompliant clients. If the posture assessment is not enforced, then access of client...Rule High Severity -
SRG-NET-000512-NAC-002310
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The Cisco ISE must have a posture policy for posture required clients defined in the NAC System Security Plan (SSP). This is required for compliance with C2C Step 2.
Posture assessments can reduce the risk that clients impose on networks. The posture policy is the function that can link requirements to applicable clients. Multiple requirements can be associated...Rule High Severity
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