Detection: Splunk Information Disclosure in Splunk Add-on Builder

Updated Date: 2024-05-20 ID: b7b82980-4a3e-412e-8661-4531d8758735 Author: Rod Soto, Eric McGinnis Type: Hunting Product: Splunk Enterprise Security

Description

The following analytic identifies the presence of vulnerable versions of Splunk Add-on Builder (below 4.1.4) that write sensitive information to internal log files. It uses REST API queries to check installed app versions and flags those below the secure threshold. This activity is significant because it exposes sensitive data, which could be exploited by attackers. If confirmed malicious, this vulnerability could lead to unauthorized access to sensitive information, compromising the security and integrity of the Splunk environment. Immediate updates to version 4.1.4 or higher are recommended.

Search

1
2| rest /services/apps/local 
3| search disabled=0 core=0 label="Splunk Add-on Builder" 
4| dedup label 
5| search version < 4.1.4 
6| eval WarningMessage="Splunk Add-on Builder Versions older than v4.1.4 contain a critical vulnerability. Update to Splunk Add-on Builder v4.1.4 or higher immediately. For more information about this vulnerability, please refer to https://advisory.splunk.com/advisories/SVD-2024-0111" 
7| table label version WarningMessage 
8| `splunk_information_disclosure_in_splunk_add_on_builder_filter`

Data Source

Name	Platform	Sourcetype	Source	Supported App
Splunk	Splunk	`'splunkd_ui_access'`	`'splunkd_ui_access.log'`	N/A

Macros Used

Name	Value

| splunk_information_disclosure_in_splunk_add_on_builder_filter | search * |

splunk_information_disclosure_in_splunk_add_on_builder_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
T1082	System Information Discovery	Discovery

KillChainPhase.EXPLOITAITON

NistCategory.DE_AE

Cis18Value.CIS_10

APT18

APT19

APT3

APT32

APT37

APT38

APT41

Aquatic Panda

Blue Mockingbird

Chimera

Confucius

Darkhotel

FIN13

FIN8

Gamaredon Group

HEXANE

Higaisa

Inception

Ke3chang

Kimsuky

Lazarus Group

Magic Hound

Malteiro

Moses Staff

MuddyWater

Mustang Panda

Mustard Tempest

OilRig

Patchwork

Rocke

Sandworm Team

SideCopy

Sidewinder

Sowbug

Stealth Falcon

TA2541

TeamTNT

ToddyCat

Tropic Trooper

Turla

Volt Typhoon

Windigo

Windshift

Wizard Spider

ZIRCONIUM

admin@338

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

This search should be run on search heads where Splunk Add-on Builder may be installed. The results of this search will conclusively show whether or not a vulnerable version of Splunk Add-on Builder is currently installed.

Known False Positives

This search is highly specific for vulnerable versions of Splunk Add-on Builder. There are no known false positives.

Associated Analytic Story

Splunk Vulnerabilities

Risk Based Analytics (RBA)

Risk Message	Risk Score	Impact	Confidence
Vulnerable $version$ of Splunk Add-on Builder found - Upgrade Immediately.	100	100	100

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-2024-0111

Detection Testing

Test Type	Status	Dataset	Source	Sourcetype
Validation	✅ Passing	N/A	N/A	N/A
Unit	✅ Passing	Dataset	`none`	`none`
Integration	✅ Passing	Dataset	`none`	`none`

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