:warning: THIS IS A EXPERIMENTAL DETECTION

This detection has been marked experimental by the Splunk Threat Research team. This means we have not been able to test, simulate, or build datasets for this detection. Use at your own risk. This analytic is NOT supported.

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Description

This search will enumerate all Splunk Accounts with administrative rights on this instance. It deliberately ignores the default admin account since this is assumed to be present. This search may help in a detection the Cross-Site Scripting Attack listed: In Splunk Enterprise versions below 8.1.13, 8.2.10, and 9.0.4, a View allows for Cross-Site Scripting in an XML View through the 'layoutPanel' attribute in the 'module' tag. The vulnerability affects instances with Splunk Web enabled.

  • Type: Hunting

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

  • Last Updated: 2023-02-07
  • Author: Rod Soto
  • ID: 401d689c-8596-4c6b-a710-7b6fdca296d3

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1189 Drive-by Compromise Initial Access
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 3
  • CIS 5
  • CIS 16
CVE
ID Summary CVSS
CVE-2023-22933 In Splunk Enterprise versions below 8.1.13, 8.2.10, and 9.0.4, a View allows for Cross-Site Scripting (XSS) in an extensible mark-up language (XML) View through the ‘layoutPanel’ attribute in the ‘module’ tag’. The vulnerability affects instances with Splunk Web enabled. None 


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| rest splunk_server=local /services/authentication/users 
|search capabilities=admin* OR imported_capabilities=admin* title!=admin 
| table title roles capabilities splunk_server 
| `splunk_list_all_nonstandard_admin_accounts_filter`

Macros

The SPL above uses the following Macros:

:information_source: splunk_list_all_nonstandard_admin_accounts_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.

  • capabilities
  • splunk_server
  • title

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. If there have been admin account, in addition to the standard admin account, intentionally created on this server, then edit the filter macro to exclude them.

Known False Positives

It is not possible to discern from the user table whether or not users with admin rights have been created intentionally, accidentally, or as a result of exploitation. Each user with these rights should be investigated and, if legitimate, added to the filter macro above. If a user is not believed to be legitimate, then further investigation should take place.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
25.0 50 50 Potential stored XSS 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