How does a SQL injection attack work?

• A. By stealing user credentials directly
• B. By inserting malicious SQL queries
• C. By compromising network hardware
• D. By exploiting weak passwords

Answer: (B)

A SQL injection attack works by exploiting vulnerabilities in an application that interacts with a database. When an attacker is able to insert or "inject" malicious SQL code into a query, they can manipulate the database in unintended ways. This occurs when the application fails to properly sanitize or validate user input before incorporating it into SQL commands.

For example, if an application constructs a SQL query using user input without adequate escaping or parameterization, an attacker can provide input that modifies the structure of the SQL command, potentially allowing them to access sensitive data, modify records, or even execute administrative operations on the database.

This technique does not directly steal user credentials or compromise network hardware; instead, it exploits the communication between the application and the database. As a result, SQL injection remains a prevalent threat in web applications due to poor coding practices and inadequate data validation measures, making it crucial for developers to be aware of and implement secure coding practices to mitigate this type of vulnerability.