SELECT '' INTO OUTFILE '/var/www/html/shell.php'; User Defined Functions (UDF)
mysql-info : Fetches protocol version, thread ID, status flags, and capabilities.
Before you can check a database, you must find it. This step is called scanning. mysql hacktricks verified
Restrict root access to localhost to prevent external brute-force attacks.
All the attacker techniques discussed can be prevented or severely mitigated by implementing a robust, defense-in-depth security posture. SELECT ' ' INTO OUTFILE '/var/www/html/shell
: Specific "verified" payloads check the database version to tailor further attacks. Using /*!80027 10*/ will only return results if the MySQL version is higher than 8.0.27.
Execute arbitrary system commands with the privileges of the user running the MySQL service process (often mysql or root in poorly configured environments): SELECT sys_eval('id; whoami; uname -a'); Use code with caution. Restrict root access to localhost to prevent external
If the application displays database errors on the frontend, you can force MySQL to leak information through functions like ExtractValue() or UpdateXML() : AND extractvalue(rand(),concat(0x3a,version())) Use code with caution. Union-Based Injection
Modern MySQL versions often default secure_file_priv to NULL or a specific path, rendering this specific technique "Unverified" on hardened systems.
Old software has known bugs. Finding the exact version number helps you know if the system is weak. Connecting and Testing Logins