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Description

This hunting search provides information on detecting a vulnerability In Splunk Enterprise versions lower than 8.1.14, 8.2.12, 9.0.6, and 9.1.1, an attacker can use the printf SPL function to perform a denial of service against the Splunk Enterprise instance.

  • Type: Hunting

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

  • Last Updated: 2023-08-30
  • Author: Rod Soto, Eric McGinnis, Splunk
  • ID: 78b48d08-075c-4eac-bd07-e364c3780867

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1499.004 Application or System Exploitation Impact
Kill Chain Phase
  • Actions On Objectives
NIST
  • DE.AE
CIS20
  • CIS 10
CVE
ID Summary CVSS
CVE-2023-40594 In Splunk Enterprise versions lower than 8.2.12, 9.0.6, and 9.1.1, an attacker can use the printf SPL function to perform a denial of service (DoS) against the Splunk Enterprise instance. None 


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`audit_searches` "*makeresults * eval * fieldformat *printf*" user!="splunk_system_user" search!="*audit_searches*" 
| stats count by user splunk_server host search 
| convert ctime(*time) 
|`splunk_dos_via_printf_search_function_filter`

Macros

The SPL above uses the following Macros:

:information_source: splunk_dos_via_printf_search_function_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.

  • user
  • splunk_server
  • host
  • search

How To Implement

This search requires the ability to search internal indexes.

Known False Positives

This search may produces false positives, analyst most focuse in the use of printf conversion function of eval to craft an expression that splunkd cannot interpret correctly causing it to crash.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
100.0 100 100 Possible denial of service attack against $host$

: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