Detection: Splunk Persistent XSS via Props Conf

Updated Date: 2024-10-17 ID: d7b5aa71-157f-4359-9c34-e35752b1d0a2 Author: Rod Soto Type: Hunting Product: Splunk Enterprise Security

Description

In Splunk Enterprise versions below 9.2.3 and 9.1.6 and Splunk Cloud Platform versions below 9.2.2403.108 and 9.1.2312.205, a low-privileged user that does not hold the “admin” or “power” Splunk roles could craft a malicious payload through entity.details in props.conf that could result in execution of unauthorized JavaScript code in the browser of a user.

Search

1`splunkd_ui` status=201 uri_path="*/splunkd/__raw/servicesNS/*/*/configs/*" 
2
3| stats count min(_time) as firstTime max(_time) as lastTime by host clientip user uri status 
4
5| `security_content_ctime(firstTime)` 
6
7| `security_content_ctime(lastTime)` 
8
9| `splunk_persistent_xss_via_props_conf_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_persistent_xss_via_props_conf_filter	`search *`

splunk_persistent_xss_via_props_conf_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
T1189	Drive-by Compromise	Initial Access

KillChainPhase.DELIVERY

NistCategory.DE_AE

Cis18Value.CIS_10

APT19

APT28

APT32

APT37

APT38

Andariel

Axiom

BRONZE BUTLER

CURIUM

Daggerfly

Dark Caracal

Darkhotel

Dragonfly

Earth Lusca

Elderwood

Lazarus Group

Leafminer

Leviathan

Machete

Magic Hound

Mustard Tempest

PLATINUM

PROMETHIUM

Patchwork

RTM

Threat Group-3390

Transparent Tribe

Turla

Windigo

Windshift

Winter Vivern

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 Risk Event	False

This configuration file applies to all detections of type hunting.

Implementation

Requires access to internal index and web component enabled.

Known False Positives

This is a hunting search that provides information on the creation of a scheduled view against the targeted endpoint("/splunkd/__raw/servicesNS/user/search/configs/"). In the attack flow the payload is saved via scheduled view then sent to the victim.

Associated Analytic Story

Splunk Vulnerabilities

Risk Based Analytics (RBA)

Risk Message	Risk Score	Impact	Confidence
Potential XSS attack against $host$	1	10	10

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-2024-1011

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