When direct service access is blocked by firewalls, web applications interacting with MySQL frequently expose the database via SQL Injection. Union-Based Injection
If the database server shares a host with a web server and you know the absolute path of the web root, you can drop a web shell: mysql hacktricks verified
: Convert a pre-compiled UDF exploit binary (such as those bundled with Metasploit or SQLMap) into hexadecimal format. Write Payload to Disk : When direct service access is blocked by firewalls,
Modern MySQL installations strictly control file operations using the secure_file_priv global variable. You must inspect this variable before attempting file reads or writes. SHOW VARIABLES LIKE "secure_file_priv"; Use code with caution. You must inspect this variable before attempting file
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This flaw was largely fixed in MySQL 8.0 by adding proper privilege checks. However, certain joins and derived tables may still expose column or key names if permissions are misconfigured.