ID | Technique | Tactic |
---|---|---|
T1189 | Drive-by Compromise | Initial Access |
Detection: Splunk XSS in Monitoring Console
EXPERIMENTAL DETECTION
This detection status is set to experimental. The Splunk Threat Research team has not yet fully tested, simulated, or built comprehensive datasets for this detection. As such, this analytic is not officially supported. If you have any questions or concerns, please reach out to us at research@splunk.com.
Description
The following analytic identifies attempts to exploit a reflective Cross-Site Scripting (XSS) vulnerability in the Splunk Distributed Monitoring Console app. It detects GET requests with suspicious query parameters by analyzing splunkd_web
logs in the _internal index. This activity is significant because it targets a known vulnerability (CVE-2022-27183) that could allow attackers to execute arbitrary scripts in the context of the user's browser. If confirmed malicious, this could lead to unauthorized actions, data theft, or further compromise of the Splunk environment.
Search
1`splunkd_web` method="GET" uri_query="description=%3C*"
2| table _time host status clientip user uri
3| `splunk_xss_in_monitoring_console_filter`
Data Source
Name | Platform | Sourcetype | Source | Supported App |
---|---|---|---|---|
N/A | N/A | N/A | N/A | N/A |
Macros Used
Name | Value |
---|---|
splunkd_web | index=_internal sourcetype=splunk_web_access |
splunk_xss_in_monitoring_console_filter | search * |
splunk_xss_in_monitoring_console_filter
is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Annotations
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 |
Implementation
This detection does not require you to ingest any new data. The detection does require the ability to search the _internal index. This detection will find attempted exploitation of CVE-2022-27183.
Known False Positives
Use of the monitoring console where the less-than sign (<) is the first character in the description field.
Associated Analytic Story
Risk Based Analytics (RBA)
Risk Message | Risk Score | Impact | Confidence |
---|---|---|---|
A potential XSS attempt has been detected from $user$ | 40 | 50 | 80 |
References
Detection Testing
Test Type | Status | Dataset | Source | Sourcetype |
---|---|---|---|---|
Validation | Not Applicable | N/A | N/A | N/A |
Unit | ✅ Passing | Dataset | /opt/splunk/var/log/splunk/web_access.log |
splunk_web_access |
Integration | ✅ Passing | Dataset | /opt/splunk/var/log/splunk/web_access.log |
splunk_web_access |
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: 3