The following analytic identifies the payload related to Spring4Shell, CVE-2022-22965. This analytic uses Splunk Stream HTTP to view the http request body, form data. STRT reviewed all the current proof of concept code and determined the commonality with the payloads being passed used the same fields "class.module.classLoader.resources.context.parent.pipeline.first".
- Type: TTP
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2022-04-06
- Author: Michael Haag, Splunk
- ID: fcdfd69d-0ca3-4476-920e-9b633cb4593e
Kill Chain Phase
- CIS 13
|CVE-2022-22965||A Spring MVC or Spring WebFlux application running on JDK 9+ may be vulnerable to remote code execution (RCE) via data binding. The specific exploit requires the application to run on Tomcat as a WAR deployment. If the application is deployed as a Spring Boot executable jar, i.e. the default, it is not vulnerable to the exploit. However, the nature of the vulnerability is more general, and there may be other ways to exploit it.||7.5|
1 2 3 4 5 6 `stream_http` http_method IN ("POST") | stats values(form_data) as http_request_body min(_time) as firstTime max(_time) as lastTime count by src dest http_method http_user_agent uri_path url bytes_in bytes_out | search http_request_body IN ("*class.module.classLoader.resources.context.parent.pipeline.first.fileDateFormat=_*", "*class.module.classLoader.resources.context.parent.pipeline.first.pattern*","*suffix=.jsp*") | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `web_spring4shell_http_request_class_module_filter`
The SPL above uses the following Macros:
web_spring4shell_http_request_class_module_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
List of fields required to use this analytic.
How To Implement
To successfully implement this search, you need to be ingesting logs with the stream HTTP logs or network logs that catch network traffic. Make sure that the http-request-body, payload, or request field is enabled.
Known False Positives
False positives may occur and filtering may be required. Restrict analytic to asset type.
Associated Analytic Story
|72.0||90||80||A http body request related to Spring4Shell has been sent to $dest$ by $src$.|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
source | version: 1