Splunk Enterprise must use TLS 1.2 and SHA-2 or higher cryptographic algorithms.

Without cryptographic integrity protections, information can be altered by unauthorized users without detection. To protect the integrity of the authenticator and authentication mechanism used for the cryptographic module used by the network device, the application, operating system, or protocol must be configured to use one of the following hash functions for hashing the password or other authenticator in accordance with SP 800-131Ar1: SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/224, SHA-512/256, SHA3-224, SHA3-256, SHA3-384, and SHA3-512. Splunk Enterprise, by default, is compliant with this requirement. But since the settings can be overridden, the check and fix text in this requirement is necessary.

In the Splunk installation folder, check the following files in the $SPLUNK_HOME/etc/system/local folder: (Note that these files may exist in one of the following folders or its subfolders: $SPLUNK_HOME/etc/apps/ $SPLUNK_HOME/etc/slave-apps/) inputs.conf Check for the following lines; if they do not exist, the settings are compliant. If they exist, they must match the settings below: sslVersions = tls1.2 cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM- SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA- AES128-SHA256:ECDHE-RSA-AES128-SHA256 ecdhCurves = prime256v1, secp384r1, secp521r1 outputs.conf Check for the following lines; if they do not exist, the settings are compliant. If they exist, they must match the settings below: sslVersions = tls1.2 cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM- SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA- AES128-SHA256:ECDHE-RSA-AES128-SHA256 ecdhCurves = prime256v1, secp384r1, secp521r1 server.conf Check for the following lines; if they do not exist, the settings are compliant. If they exist, they must match the settings below: sslVersions = tls1.2 sslVersionsForClient = tls1.2 cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM- SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA- AES128-SHA256:ECDHE-RSA-AES128-SHA256:AES256-GCM-SHA384:AES128-GCM-SHA256:AES128-SHA256 ecdhCurves = prime256v1, secp384r1, secp521r1 web.conf Check for the following lines; if they do not exist, the settings are compliant. If they exist, they must match the settings below: sslVersions = tls1.2 cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM- SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA- AES128-SHA256:ECDHE-RSA-AES128-SHA256 ecdhCurves = prime256v1, secp384r1, secp521r1 Check the following file in the $SPLUNK_HOME/etc/openldap folder: ldap.conf Check for the following lines; they must match the settings below: #TLS_PROTOCOL_MIN: 3.1 for TLSv1.0, 3.2 for TLSv1.1, 3.3 for TLSv1.2. TLS_PROTOCOL_MIN 3.3 TLS_CIPHER_SUITE ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM- SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA- AES128-SHA256:ECDHE-RSA-AES128-SHA256 If any of the above settings do not match, this is a finding.

In the Splunk installation folder, check the following files in the $SPLUNK_HOME/etc/system/local folder: (Note that these files may exist in one of the following folders or its subfolders: $SPLUNK_HOME/etc/apps/ $SPLUNK_HOME/etc/slave-apps/) inputs.conf Check for the following lines; if they do not exist, the settings are compliant. If they exist, they must match the settings below or be removed: sslVersions = tls1.2 cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM- SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA- AES128-SHA256:ECDHE-RSA-AES128-SHA256 ecdhCurves = prime256v1, secp384r1, secp521r1 outputs.conf Check for the following lines; if they do not exist, the settings are compliant. If they exist, they must match the settings below or be removed: sslVersions = tls1.2 cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM- SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA- AES128-SHA256:ECDHE-RSA-AES128-SHA256 ecdhCurves = prime256v1, secp384r1, secp521r1 server.conf Check for the following lines; if they do not exist, the settings are compliant. If they exist, they must match the settings below or be removed: sslVersions = tls1.2 sslVersionsForClient = tls1.2 cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM- SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA- AES128-SHA256:ECDHE-RSA-AES128-SHA256:AES256-GCM-SHA384:AES128-GCM-SHA256:AES128-SHA256 ecdhCurves = prime256v1, secp384r1, secp521r1 web.conf Check for the following lines; if they do not exist, the settings are compliant. If they exist, they must match the settings below or be removed: sslVersions = tls1.2 cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM- SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA- AES128-SHA256:ECDHE-RSA-AES128-SHA256 ecdhCurves = prime256v1, secp384r1, secp521r1 Check the following file in the $SPLUNK_HOME/etc/openldap folder: ldap.conf Check for the following lines; they must match the settings below: #TLS_PROTOCOL_MIN: 3.1 for TLSv1.0, 3.2 for TLSv1.1, 3.3 for TLSv1.2. TLS_PROTOCOL_MIN 3.3 TLS_CIPHER_SUITE ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM- SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA- AES128-SHA256:ECDHE-RSA-AES128-SHA256