SQL injection testing in Testing Fundamentals - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding SQL Injection Risks

Which of the following best describes why SQL injection is a serious security risk?

A It allows attackers to modify database queries to access or manipulate data without authorization.

B It causes the database server to crash due to syntax errors in queries.

C It encrypts the database making data unreadable to users.

D It automatically updates the database schema without developer consent.

💡 Hint

Think about what happens when user input is not handled safely in database queries.

SQL injection lets attackers change the intended database commands, which can lead to unauthorized data access or changes.

❓ Predict Output

intermediate

Detecting SQL Injection Vulnerability Output

What will be the output of the following Python code simulating a vulnerable SQL query if the user input is "' OR '1'='1"?

Testing Fundamentals

user_input = "' OR '1'='1"
query = f"SELECT * FROM users WHERE username = '{user_input}'"
print(query)

A SELECT * FROM users WHERE username = '' OR 1=1

B SELECT * FROM users WHERE username = '' OR '1'='1'

C SELECT * FROM users WHERE username = 'user_input'

D SyntaxError due to unmatched quotes

💡 Hint

Look carefully at how the input is inserted into the query string.

The input is inserted directly, so the query becomes: SELECT * FROM users WHERE username = '' OR '1'='1', which always returns true.

❓ assertion

advanced

Choosing the Correct Assertion for SQL Injection Test

You run an automated test that sends a malicious input to a login form. Which assertion best verifies the application is protected against SQL injection?

A Assert that the response redirects to the admin dashboard.

B Assert that the response status code is 500 Internal Server Error.

C Assert that the response contains raw SQL code.

D Assert that the response contains an error message about invalid credentials.

💡 Hint

Think about what a safe application should do when given bad input.

A safe app rejects the login with an invalid credentials message. A server error or SQL code exposure means vulnerability.

🔧 Debug

advanced

Debugging a Failing SQL Injection Test

Given this test code snippet, why does the SQL injection test fail to detect vulnerability?

def test_sql_injection(client):
    payload = "' OR '1'='1"
    response = client.post('/login', data={'username': payload, 'password': 'any'})
    assert b"Welcome" not in response.data

A The test fails because the assertion expects no welcome message, but the app always shows it regardless of login success.

B The payload is not properly escaped, causing a syntax error in the test code.

C The test uses POST instead of GET, which is not supported by the login endpoint.

D The assertion is reversed; it should check that the welcome message is present.

💡 Hint

Consider what the app actually returns on failed login attempts.

If the app always shows "Welcome" regardless of login success, the test assertion will fail to detect injection.

❓ framework

expert

Designing a SQL Injection Test Framework Feature

Which feature is most effective to include in an automated testing framework to detect SQL injection vulnerabilities?

A Runs unit tests on backend functions without any user input simulation.

B Only tests for cross-site scripting (XSS) vulnerabilities in the frontend code.

C Automatically injects common SQL injection payloads into all input fields and checks for database errors or unexpected data exposure.

D Validates HTML syntax of all web pages to ensure accessibility compliance.

💡 Hint

Think about what helps find SQL injection issues automatically.

Injecting known SQL attack strings and checking for errors or data leaks helps find injection flaws effectively.