Splunk Authenticated XSLT Upload RCE

This Metasploit module exploits a Remote Code Execution (RCE) vulnerability in Splunk Enterprise.
The affected versions include 9.0.x before 9.0.7 and 9.1.x before 9.1.2. The exploitation process leverages
a weakness in the XSLT transformation functionality of Splunk. Successful exploitation requires valid
credentials, typically 'admin:changeme' by default.

The exploit involves uploading a malicious XSLT file to the target system. This file, when processed by the
vulnerable Splunk server, leads to the execution of arbitrary code. The module then utilizes the 'runshellscript'
capability in Splunk to execute the payload, which can be tailored to establish a reverse shell. This provides
the attacker with remote control over the compromised Splunk instance. The module is designed to work
seamlessly, ensuring successful exploitation under the right conditions.