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Description

This search will check the TLS validation is properly configured on the search head it is run from as well as its search peers after Splunk version 9. Other components such as additional search heads or anything this rest command cannot be distributed to will need to be manually checked.

  • Type: Hunting
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2022-05-26
  • Author: Lou Stella, Splunk
  • ID: 3c162281-7edb-4ebc-b9a4-5087aaf28fa7

Annotations

ATT&CK
ID Technique Tactic
T1587.003 Digital Certificates Resource Development
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 3
  • CIS 5
  • CIS 16
CVE
ID Summary CVSS
CVE-2022-32153 Splunk Enterprise peers in Splunk Enterprise versions before 9.0 and Splunk Cloud Platform versions before 8.2.2203 did not validate the TLS certificates during Splunk-to-Splunk communications by default. Splunk peer communications configured properly with valid certificates were not vulnerable. However, an attacker with administrator credentials could add a peer without a valid certificate and connections from misconfigured nodes without valid certificates did not fail by default. For Splunk Enterprise, update to Splunk Enterprise version 9.0 and Configure TLS host name validation for Splunk-to-Splunk communications (https://docs.splunk.com/Documentation/Splunk/9.0.0/Security/EnableTLSCertHostnameValidation) to enable the remediation. 6.8
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| rest /services/server/info 
| table splunk_server version server_roles 
| join splunk_server [
| rest /servicesNS/nobody/search/configs/conf-server/ search="sslConfig"
| table splunk_server sslVerifyServerCert sslVerifyServerName serverCert] 
| fillnull value="Not Set" 
| rename sslVerifyServerCert as "Server.conf:SslConfig:sslVerifyServerCert", sslVerifyServerName as "Server.conf:SslConfig:sslVerifyServerName", serverCert as "Server.conf:SslConfig:serverCert" 
| `splunk_digital_certificates_infrastructure_version_filter`

Macros

The SPL above uses the following Macros:

:information_source: splunk_digital_certificates_infrastructure_version_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

  • none

How To Implement

The user running this search is required to have a permission allowing them to dispatch REST requests to indexers (the dispatch_rest_to_indexers capability) in some architectures. Splunk SOAR customers can find a SOAR workbook that walks an analyst through the process of running these hunting searches in the references list of this detection. In order to use this workbook, a user will need to run a curl command to post the file to their SOAR instance such as “curl -u username:password https://soar.instance.name/rest/rest/workbook_template -d @splunk_psa_0622.json”. A user should then create an empty container or case, attach the workbook, and begin working through the tasks.

Known False Positives

No known at this time.

Associated Analytic story

RBA

Risk Score Impact Confidence Message
50.0 50 100 $splunk_server$ may not be properly validating TLS Certificates

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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