Mysql 5.0.12 Exploit File

The MySQL 5.0.12 exploit is a perfect storm of poor privilege separation, dangerous defaults, and reliance on filesystem security. It teaches us three enduring truths of database security:

If you discover MySQL 5.0.12 in your environment today, do not patch it—air-gap it behind a firewall, migrate the data immediately, and decommission the server. The exploit code might be 18 years old, but it works as reliably now as it did in 2005.

And for the penetration testers: Add the UDF exploit to your checklist. You will be surprised how often it still opens the door.

Assume the buffer is at ebp-0x100. A payload might be: mysql 5.0.12 exploit

[ NOP × 200 ] [ shellcode (reverse TCP) ] [ padding to offset 264 ] [ 0x7C86467B ]  // JMP ESP in kernel32.dll

When the return address is overwritten, execution lands in the NOP sled, then shellcode runs – giving the attacker a command shell on the victim’s machine with the permissions of the application that called MySQL (often SYSTEM or a web server user).

Ensure the plugin directory is not world-writable:

chown root:mysql /usr/lib/mysql/plugin/
chmod 755 /usr/lib/mysql/plugin/

In MySQL 5.0.12, the server did not properly validate the path of the shared library nor the privileges required to execute arbitrary code within the function. Specifically: The MySQL 5

To appreciate the exploit, we must first understand the environment. In late 2005:

MySQL 5.0.12 was compiled with few modern mitigations. The client library (libmysqlclient) trusted user input and network data deeply.

By 2008, the MySQL 5.0.12 UDF exploit was fully automated in Metasploit Framework. The module exploit/multi/mysql/mysql_udf_payload streamlined the process: If you discover MySQL 5

For forensic investigators, this means that finding UDF artifacts—even years later—is a red flag.

An attacker would set up a rogue MySQL server. When a vulnerable client connects, the server replies with a handshake packet containing:

The crafted version string is where the magic happens. It contains:

Because the buffer is on the stack, overwriting it changes the function’s return address. When mysql_real_connect() finishes, the program jumps into attacker-controlled memory.

MySQL 5.0.12 to 5.0.22 was a 6-month window. Many systems went unpatched for years. Inventory your database clients – not just servers. Your monitoring tool, ETL job, or cron script might be the entry point.