When the FILE privilege is restricted, or when you need a more direct route to system command execution, User Defined Functions (UDFs) are the premier technique. UDFs allow you to create custom functions in C/C++ and compile them into shared libraries ( .so on Linux, .dll on Windows) that MySQL can load and execute.

Modern MySQL restricts file operations via secure_file_priv . To check:

, you can:

Extract hashes and feed them to John for offline cracking. MySQL password hashes can be cracked with John’s MySQL module.

A clever attack: When the MySQL client connects to a malicious server, the server can request arbitrary files from the client using LOAD DATA LOCAL INFILE . This can read sensitive client files like ~/.mysql_history , my.cnf , or even SSH keys.

This vulnerability allows privilege escalation from the mysql system account to root through unsafe error‑log handling. The exploit works when file‑based logging is configured (default) and syslog logging is not enabled.

If you know the absolute path to a web-accessible directory (e.g., /var/www/html/ ), you can write a web shell directly to the server:

If password policies are weak, tools like hydra can rapidly test credential lists against the service: hydra -L usernames.txt -P passwords.txt mysql:// Use code with caution. The Historical CVE-2012-2122 Bypass

SELECT 1 AND EXTRACTVALUE(1, CONCAT(0x7e, database(), 0x7e));

To further expand your knowledge on active database exploitation vectors, explore documentation regarding automated SQL injection with sqlmap or review standard configurations outlined in the OWASP SQL Injection Prevention Guide. If you would like to expand this assessment, let me know: Your specific target (Linux or Windows?) The specific MySQL version you are targeting

Utilize the MySQL Enterprise Firewall to monitor and block abnormal queries that match known SQL injection patterns.