A remote attacker could send a specially crafted authentication packet with an invalid username length field. The server’s check_connection() function failed to properly validate length fields before memcpy operations. By setting a specific length (e.g., 0xFFFF or a null-byte offset), an attacker could force the server to skip password checks entirely, logging in as any user—including root—without a password.
The MySQL 5.0.12 exploit is a serious vulnerability that can have significant consequences if not addressed. By understanding the technical details of the exploit and taking steps to mitigate and prevent it, users and administrators can protect themselves from this vulnerability. Upgrading to a non-vulnerable version of MySQL, using a firewall, and implementing strong security measures are all effective ways to prevent this exploit.
DLLEXP long long sys_exec(char *command) { return system(command); } mysql 5.0.12 exploit
The MySQL 5.0.12 exploit works by sending a specially crafted packet to the MySQL server. This packet is designed to overflow a buffer in the server, allowing the attacker to execute arbitrary code. The exploit requires the attacker to have a valid username and password to connect to the MySQL server. However, once connected, the attacker can execute any SQL command, including creating new users, modifying existing users, or even shutting down the server.
Upon gaining access via mysql -u lowpriv -p , the attacker runs: A remote attacker could send a specially crafted
method. This remains a classic example of how administrative access to a database can be escalated to full OS-level Remote Code Execution (RCE). Vulnerability Overview MySQL version 5.0.12 Vulnerability Type: Privilege Escalation / Remote Code Execution (RCE) User-Defined Function (UDF) Injection Requirement: MySQL credentials with privileges (typically a root-level database user). 1. The Concept
MySQL released and 5.0.15 (for cumulative fixes) with the following changes: The MySQL 5
The MySQL 5.0.12 exploit is a vulnerability that was discovered in MySQL version 5.0.12, which was released in 2005. This vulnerability allows an attacker to execute arbitrary code on a server running MySQL, potentially leading to a complete compromise of the system. The exploit takes advantage of a buffer overflow vulnerability in the MySQL server, which can be triggered by a malicious client.
Today, MySQL 8.0 and MariaDB 10.x require UDFs to be declared with specific mysql_function attributes, and cloud databases (RDS, Cloud SQL) explicitly disable FILE and dynamic library loading by default.
If secure_file_priv is empty (not set to a specific directory), the attack proceeds.