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Description

The following analytic identifies potential exploitation of the WordPress Bricks Builder plugin RCE vulnerability. The search is focused on the URL path "/wp-json/bricks/v1/render_element" with a status code of 200 and a POST method. It has been addressed by the theme developers in version 1.9.6.1 released on February 13, 2024. The vulnerability is tracked as CVE-2024-25600. The POC exploit is simple enough and will spawn commands on the target server. The exploit is actively being used in the wild.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Web
  • Last Updated: 2024-02-22
  • Author: Michael Haag, Splunk
  • ID: 56a8771a-3fda-4959-b81d-2f266e2f679f

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1190 Exploit Public-Facing Application Initial Access
Kill Chain Phase
  • Delivery
NIST
  • DE.CM
CIS20
  • CIS 13
CVE
ID Summary CVSS
CVE-2024-25600     


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| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Web where Web.url IN ("*/wp-json/bricks/v1/render_element") Web.status=200 Web.http_method=POST by Web.src, Web.dest, Web.http_user_agent, Web.url, Web.uri_path, Web.status, Web.http_method, sourcetype, source 
| `drop_dm_object_name("Web")` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `wordpress_bricks_builder_plugin_rce_filter`

Macros

The SPL above uses the following Macros:

:information_source: wordpress_bricks_builder_plugin_rce_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • _time
  • Web.src
  • Web.dest
  • Web.http_user_agent
  • Web.url
  • Web.status
  • Web.http_method
  • sourcetype
  • source

How To Implement

The search is based on data in the Web datamodel and was modeled from NGINX logs. Ensure that the Web datamodel is accelerated and that the data source for the Web datamodel is properly configured. If using other web sources, modify they query, or review the data, as needed.

Known False Positives

False positives may be possible, however we restricted it to HTTP Status 200 and POST requests, based on the POC. Upon investigation review the POST body for the actual payload - or command - being executed.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
100.0 100 100 Potential exploitation of the WordPress Bricks Builder plugin RCE vulnerability on $dest$ by $src$.

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

Reference

Test Dataset

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 | version: 1