This module exploits a vulnerability found in Project Pier. The application's uploading tool does not require any authentication, which allows a malicious user to upload an arbitrary file onto the web server, and then cause remote code execution by simply requesting it. This module is known to work against Apache servers due to the way it handles an extension name, but the vulnerability may not be exploitable on others.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
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