Detection: Splunk Persistent XSS via Props Conf

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.

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 icon 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

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

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: 1