User Defined Functions (UDF) allow the execution of shared library functions. : Uploading a malicious (Linux) or (Windows) file to the plugin directory.

If the MySQL user has the FILE privilege and the secure_file_priv configuration allows it (or is empty), you can read arbitrary files from the server's disk using a standard SELECT statement. mysql hacktricks verified

Not every HackTricks command works everywhere. Here is the reality check: User Defined Functions (UDF) allow the execution of

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(hex encoded to bypass restrictions):

functions to force the database to pause. If the page load time matches the specified delay, the injection is verified. Verified Enumeration & Exploitation

Exploiting insecure defaults & exposed ports