MySQL User Enumeration Scanner

MySQL is a widely-used open-source relational database management system, often utilized for web applications and online data storage. It is a central component of the LAMP (Linux, Apache, MySQL, PHP) software stack and is favored by small to large-sized businesses due to its high-performance capabilities and scalability. MySQL serves a significant role in data-driven applications providing backend database support for e-commerce, content management systems, and custom applications. As an enterprise-grade database, it is used in industries from software development companies to educational institutions. By allowing for efficient data storage, retrieval, and management, it forms the backbone of many modern digital solutions. Given its open-source nature, MySQL's reliability and ease-of-use are valued by both developers and DBAs.

User Enumeration is a vulnerability that can expose authorized user accounts within a system, potentially aiding in further attacks. This type of vulnerability typically occurs when systems reveal whether a requested user identifier exists within the system, allowing attackers to gather valid usernames for credential stuffing or brute force attacks. Enumeration attacks exploit weak authentication or validation processes by making automated requests to list valid users. Additionally, revealing usernames can lead to targeted phishing or social engineering attacks, enhancing the risk profile for organizations. Detecting and mitigating user enumeration vulnerabilities are critical preventive steps in safeguarding digital assets and ensuring secure access control mechanisms.

The MySQL User Enumeration vulnerability involves unauthenticated attempts to list all user accounts within a MySQL server. Such an attempt exploits the service running on the default port 3306 to disclose sensitive user information. In this context, the vulnerability can be triggered by unauthorized actors running specific queries, like "SELECT DISTINCT user FROM mysql.user." Via a scripted attack utilizing the clusterbomb technique, various payloads of common usernames and passwords are used to extract active user accounts details. Attackers can leverage open network ports and unsecure MySQL instances to exploit these enumeration vulnerabilities.

When exploited, MySQL User Enumeration vulnerabilities can lead to severe consequences, including unauthorized data access and potential data breaches. If malicious actors can retrieve valid usernames, they can further their attempts to compromise user credentials, increasing the risk of successful brute force attacks. The exposure of database users can also facilitate lateral movement within a network, allowing attackers to access other systems and sensitive data. Successful enumeration might also result in degrading trust in systems or services provided by the affected database.

REFERENCES

• https://nmap.org/nsedoc/scripts/mysql-users.html