SQL injection prevention MCQs in DBMS

By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 23, 2024

1. What is SQL injection?
   a) A technique to optimize database queries
   b) An attack that allows execution of arbitrary SQL commands in a database
   c) A method for encrypting SQL queries
   d) A method for backing up SQL databasesAnswer: b) An attack that allows execution of arbitrary SQL commands in a database
2. Which of the following is the most effective way to prevent SQL injection attacks?
   a) Using complex SQL queries
   b) Regularly updating the DBMS software
   c) Validating and sanitizing user inputs
   d) Using weak passwords for database accountsAnswer: c) Validating and sanitizing user inputs
3. What is parameterized querying?
   a) A technique to encrypt SQL queries
   b) A method where SQL commands are sent to the database with placeholders for parameters
   c) A way to optimize SQL queries for performance
   d) A technique to automatically update database schemasAnswer: b) A method where SQL commands are sent to the database with placeholders for parameters
4. How does using stored procedures help in preventing SQL injection?
   a) Stored procedures execute queries with hard-coded SQL statements
   b) Stored procedures allow dynamic query generation
   c) Stored procedures separate the SQL logic from user input by encapsulating the SQL commands
   d) Stored procedures are not effective against SQL injection attacksAnswer: c) Stored procedures separate the SQL logic from user input by encapsulating the SQL commands
5. Which of the following is NOT a recommended practice for preventing SQL injection attacks?
   a) Using input validation and escaping special characters
   b) Implementing least privilege access controls for database accounts
   c) Using dynamic SQL queries with user input directly embedded
   d) Regularly updating and patching the database systemAnswer: c) Using dynamic SQL queries with user input directly embedded
6. What role does input validation play in preventing SQL injection?
   a) It ensures that input values are in the correct format and do not include malicious SQL code
   b) It encrypts the SQL queries
   c) It compresses the SQL queries for faster execution
   d) It manages database user accountsAnswer: a) It ensures that input values are in the correct format and do not include malicious SQL code
7. Which of the following is an example of input sanitization?
   a) Replacing semicolons in user input with empty strings
   b) Encrypting user input before sending it to the database
   c) Using a database user with elevated privileges
   d) Regularly updating the database schemaAnswer: a) Replacing semicolons in user input with empty strings
8. What is an example of a safe coding practice to avoid SQL injection when concatenating user inputs in SQL queries?
   a) Using string concatenation to build SQL queries
   b) Using built-in database functions to sanitize user input
   c) Using parameterized queries or prepared statements
   d) Escaping user input by adding extra escape charactersAnswer: c) Using parameterized queries or prepared statements
9. Why should database accounts used by applications have the least privileges necessary?
   a) To improve query execution speed
   b) To prevent unauthorized access and limit the impact of SQL injection attacks
   c) To simplify database schema design
   d) To enable more dynamic SQL queriesAnswer: b) To prevent unauthorized access and limit the impact of SQL injection attacks
10. Which tool or technique helps in identifying SQL injection vulnerabilities during development?
    a) SQL query optimizer
    b) Static code analysis tools
    c) Data encryption techniques
    d) Database backup toolsAnswer: b) Static code analysis tools
11. What is the primary purpose of using a Web Application Firewall (WAF) in relation to SQL injection?
    a) To encrypt all SQL traffic
    b) To filter and monitor HTTP requests to detect and block SQL injection attempts
    c) To manage database backups
    d) To enhance database performanceAnswer: b) To filter and monitor HTTP requests to detect and block SQL injection attempts
12. How does escaping user input help in preventing SQL injection?
    a) By converting special characters into their SQL equivalents to ensure they are treated as data rather than code
    b) By encrypting user input
    c) By compressing user input to reduce its size
    d) By automatically updating database security patchesAnswer: a) By converting special characters into their SQL equivalents to ensure they are treated as data rather than code
13. Which of the following is NOT a typical sign of a SQL injection attack?
    a) Unusual error messages returned by the database
    b) Unexpected changes in data or database structure
    c) High performance of SQL queries
    d) Unauthorized data access or modificationAnswer: c) High performance of SQL queries
14. What should be included in the database error handling mechanism to minimize the risk of SQL injection attacks?
    a) Detailed error messages with SQL query content
    b) General error messages without revealing database details
    c) SQL query logs
    d) User input validation logsAnswer: b) General error messages without revealing database details
15. Which of the following methods is least effective in preventing SQL injection attacks?
    a) Using input validation
    b) Employing parameterized queries
    c) Using dynamic SQL queries with user inputs directly embedded
    d) Applying proper user access controlsAnswer: c) Using dynamic SQL queries with user inputs directly embedded

 

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