Title

When connecting with endpoints, Forescout must validate certificates used for Transport Layer Security (TLS) functions by performing RFC 5280-compliant certification path validation. (Cat I impact)

Discussion

A certificate's certification path is the path from the end entity certificate to a trusted root certification authority (CA). Certification path validation is necessary for a relying party to make an informed decision regarding acceptance of an end entity certificate. NAC must be configured for only Certificate Signing. The NAC must interact with TLS-compliant lookups and verification in exchange with endpoints in Extensible Authentication Protocol (EAP) transactions where TLS is supported within the EAP type. Certification path validation includes checks such as certificate issuer trust, time validity, and revocation status for each certificate in the certification path. Revocation status information for CA and subject certificates in a certification path is commonly provided via certificate revocation lists (CRLs) or online certificate status protocol (OCSP) responses.

Check Content

1. Log on using the CLIAdmin credentials established upon initial configuration. 2. Verify FIPS mode by typing the command 'fstool version'. To configure TLS: 1. Log on to the Forescout UI. 2. Select Tools >> Option >> HPS Inspection Engine >> SecureConnector. 3. In the Client-Server Connection, check the Minimum Supported TLS Version is set to TLS version 1.2. If the NAC does not perform RFC 5280-compliant certification path validation for validating certificates used for TLS functions when connecting with endpoints, this is a finding.

Fix Text

To configure FIPS Mode: 1. Log on using the CLIAdmin credentials established upon initial configuration. 2. To enable FIPS mode, type 'fstool fips'. A prompt will be generated alerting the user FIPS 140-2 will be enabled. Type "Yes" for FIPS to accept this prompt. To configure TLS: 1. Log on to the Forescout management tool. 2. Select Tools >> Option >> HPS Inspection Engine >> SecureConnector. 3. In the Client-Server Connection, set the Minimum Supported TLS Version to TLS version 1.2.

Additional Identifiers

Rule ID: SV-233340r615860_rule

Vulnerability ID: V-233340

Group Title: SRG-NET-000580-NAC-002530

Expert Comments

CCIs tied to check.

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