What causes SQL server injection vulnerabilities?

What causes SQL server injection vulnerabilities?

• A. Overly strict input validation that blocks legitimate input.
• B. The use of parameterized queries in applications.
• C. A method of performing data recovery using SQL.
• D. Invalid parameters that are not verified by the application.

Answer: (D)

SQL injection happens when an application takes user-provided data and uses it to build SQL statements without properly verifying or handling that input. When parameters aren’t verified, attackers can craft input that escapes the intended data context and injects additional SQL code into the query, changing its logic or performing unwanted actions. That’s why unverified or invalid parameters are the root cause: the application accepts them and uses them directly in SQL, allowing manipulation of the query. By contrast, using parameterized queries keeps code and data separate, preventing injected content from altering the SQL structure. Data-recovery techniques or overly strict validation that blocks legitimate input don’t create this kind of vulnerability, and they’re not the cause of SQL injection.

SQL injection happens when an application takes user-provided data and uses it to build SQL statements without properly verifying or handling that input. When parameters aren’t verified, attackers can craft input that escapes the intended data context and injects additional SQL code into the query, changing its logic or performing unwanted actions.

That’s why unverified or invalid parameters are the root cause: the application accepts them and uses them directly in SQL, allowing manipulation of the query. By contrast, using parameterized queries keeps code and data separate, preventing injected content from altering the SQL structure. Data-recovery techniques or overly strict validation that blocks legitimate input don’t create this kind of vulnerability, and they’re not the cause of SQL injection.