Detection: Splunk Disable KVStore via CSRF Enabling Maintenance Mode

Updated Date: 2024-10-16 ID: 34bac267-a89b-4bd7-a072-a48eef1f15b8 Author: Rod Soto Type: TTP Product: Splunk Enterprise Security

Description

In Splunk Enterprise versions below 9.3.1, 9.2.3, and 9.1.6 and Splunk Cloud Platform versions below 9.2.2403.108, 9.1.2312.204, and 9.1.2308.211, a low-privileged user that does not hold the “admin” or “power” Splunk roles could change the maintenance mode state of App Key Value Store (KVStore) through a Cross-Site Request Forgery (CSRF).

Search

1`splunkda` method=GET uri_path IN ("/services*", /"servicesNS*") AND uri_path = "*kvstore/maintenance/change" AND uri_query IN ("*mode=t*", "*mode=1*") 
2| stats count min(_time) as firstTime max(_time) as lastTime by user host uri clientip  
3| `security_content_ctime(firstTime)` 
4| `security_content_ctime(lastTime)`  
5| `splunk_disable_kvstore_via_csrf_enabling_maintenance_mode_filter`

Data Source

Name	Platform	Sourcetype	Source
Splunk	Splunk	`'splunkd_ui_access'`	`'splunkd_ui_access.log'`

Macros Used

Name	Value
security_content_ctime	`convert timeformat="%Y-%m-%dT%H:%M:%S" ctime($field$)`
splunk_disable_kvstore_via_csrf_enabling_maintenance_mode_filter	`search *`

splunk_disable_kvstore_via_csrf_enabling_maintenance_mode_filter is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Annotations

- MITRE ATT&CK

+ Kill Chain Phases

+ NIST

+ CIS

- Threat Actors

ID	Technique	Tactic
T1489	Service Stop	Impact

KillChainPhase.ACTIONS_ON_OBJECTIVES

NistCategory.DE_CM

Cis18Value.CIS_10

Indrik Spider

LAPSUS$

Lazarus Group

Sandworm Team

Wizard Spider

Default Configuration

This detection is configured by default in Splunk Enterprise Security to run with the following settings:

Setting	Value
Disabled	true
Cron Schedule	`0 * * * *`
Earliest Time	`-70m@m`
Latest Time	`-10m@m`
Schedule Window	`auto`
Creates Notable	Yes
Rule Title	`%name%`
Rule Description	`%description%`
Notable Event Fields	user, dest
Creates Risk Event	True

This configuration file applies to all detections of type TTP. These detections will use Risk Based Alerting and generate Notable Events.

Implementation

Requires access to internal indexes and web service enabled.

Known False Positives

This search will produce false positives, operator must verify the context of access and the use of GET request against KVStore specifiying maintenance mode, especially non admin users.

Associated Analytic Story

Splunk Vulnerabilities

Risk Based Analytics (RBA)

Risk Message	Risk Score	Impact	Confidence
Potential CSRF attack against $user$ and $host$ by placing KVStore into Maintenance Mode.	25	50	50

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

References

https://advisory.splunk.com/advisories/SVD-2024-1007

Detection Testing

Test Type	Status	Dataset	Source	Sourcetype
Validation	✅ Passing	N/A	N/A	N/A
Unit	✅ Passing	N/A	`N/A`	`N/A`
Integration	✅ Passing	N/A	`N/A`	`N/A`

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: GitHub | Version: 2