What is "SQL injection" and what type of system does it target?

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An attack technique that exploits vulnerable web applications by inserting malicious SQL commands through user input fields to manipulate or access the underlying database. SQL injection is an attack technique in which an adversary inserts malicious SQL (Structured Query Language) commands into user input fields of a web application - such as login forms, search bars, or URL parameters - to manipulate the underlying database. Successful SQL injection can allow attackers to bypass authentication, extract sensitive data, modify or delete database records, and in some cases execute commands on the underlying operating system. SQL injection consistently ranks among the top web application vulnerabilities and has been responsible for many major data breaches.

Injecting physical components into a server describes a physical hardware modification, not a software-based attack that exploits input validation failures in web applications. A legitimate database administration technique for optimizing query performance describes query optimization, which is a beneficial database management practice rather than a malicious exploitation technique. A programming method for creating databases more efficiently describes database development practices, which serve constructive purposes rather than the destructive goal of exploiting application vulnerabilities to gain unauthorized database access.

SQL injection is one of the most important web application threats on the Fundamentals of Cybersecurity exam. Students should understand how SQL injection works, the types of damage it can cause, and the primary defense mechanisms including parameterized queries (prepared statements), input validation, stored procedures, and web application firewalls. SQL injection's consistent presence on the OWASP Top 10 underscores its continued relevance.

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