Detections
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SPLK-CL-000430 - Splunk Enterprise must use TLS 1.2 and SHA-2 or higher cryptographic algorithms.
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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.
Solution
Edit the following files in the $SPLUNK_HOME/etc/system/local folder:inputs.conf: Fix is applicable to the indexer, which may be a separate machine in a distributed environment.
If the following lines do not exist, then 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 is applicable to the forwarder which is always a separate machine in the environment.
If the following lines do not exist, then 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
If the following lines do not exist, then 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 is applicable to search head or deployment server, which may be a separate machine in a distributed environment.
If the following lines do not exist, then 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 /etc/openldap folder:
ldap.conf
Check for the following lines, set to 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
Note: Splunk Enterprise must operate in FIPS mode to limit the algorithms allowed.
See Also
Item Details
References: CAT|I, CCI|CCI-000803, Rule-ID|SV-251689r1082345_rule, STIG-ID|SPLK-CL-000430, Vuln-ID|V-251689
Plugin: Unix
Control ID: 5b9e54da1735312e7f61a9f562cfd13946d37b5a79fcb929111fbd652ae9c3c1