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Description

In Splunk Enterprise versions below 8.1.13, 8.2.10, and 9.0.4, a cross-site request forgery in the Splunk Secure Gateway (SSG) app in the kvstore_client endpoint allows for updating SSG KV store collections via a GET request. SSG is a Splunk Built app included by default with Splunk Enterprise. The vulnerability affects instances with SSG and Splunk Web enabled. This hunting search provides information on affected server specific method and post data that may reveal exploitation of this vulnerability.

  • Type: TTP

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

  • Last Updated: 2023-02-14
  • Author: Rod Soto
  • ID: 4742d5f7-ce00-45ce-9c79-5e98b43b4410

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1189 Drive-by Compromise Initial Access
Kill Chain Phase
  • Delivery
NIST
  • DE.CM
CIS20
  • CIS 10
CVE
ID Summary CVSS
CVE-2023-22942 In Splunk Enterprise versions below 8.1.13, 8.2.10, and 9.0.4, a cross-site request forgery in the Splunk Secure Gateway (SSG) app in the ‘kvstore_client’ REST endpoint lets a potential attacker update SSG App Key Value Store (KV store) collections using an HTTP GET request. SSG is a Splunk-built app that comes with Splunk Enterprise. The vulnerability affects instances with SSG and Splunk Web enabled. None 


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`splunkda` uri_path="/en-US/splunkd/__raw/services/ssg/kvstore_client" method="GET" delete_field_value="spacebridge_server" status="200"  
| table  splunk_server status uri delete_field_value method post_data  
| `splunk_csrf_in_the_ssg_kvstore_client_endpoint_filter`

Macros

The SPL above uses the following Macros:

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

Required fields

List of fields required to use this analytic.

  • splunk_server
  • status
  • uri
  • delete_field_value
  • method
  • post_data

How To Implement

Requires access to internal index.

Known False Positives

This hunting search only applies to the affected versions and setup mentioned in the description of this search, it does not extract payload so it requires manual investigation after executing search. This search will produce false positives.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
25.0 50 50 Potential CSRF exploitation attempt from $host$

: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

source | version: 1