How SQL injection exploits queries - Quick Revision & Summary

Recall & Review

beginner

What is SQL injection?

SQL injection is a security attack where an attacker inserts malicious SQL code into a query to manipulate the database.

beginner

How does SQL injection exploit a query?

It exploits queries by inserting extra SQL commands into input fields that are not properly checked, changing the query's behavior.

beginner

Why is using user input directly in SQL queries dangerous?

Because attackers can add SQL code in the input, which the database runs, leading to data leaks or damage.

intermediate

What is a common way to prevent SQL injection?

Use prepared statements or parameterized queries that separate code from data, so input can't change query structure.

intermediate

Example: What happens if input is ' OR '1'='1 in a login query?

It changes the query to always be true, letting attackers bypass login without a password.

What does SQL injection allow an attacker to do?

A Run unauthorized SQL commands

B Speed up database queries

C Encrypt database data

D Backup the database automatically

SQL injection lets attackers run unauthorized SQL commands by inserting malicious code.

Which practice helps prevent SQL injection?

A Using prepared statements

B Allowing all user input directly

C Disabling database logs

D Using plain text passwords

Prepared statements separate code from data, stopping malicious input from changing queries.

What is a sign of a vulnerable SQL query?

A Using parameterized queries

B Directly inserting user input into the query string

C Encrypting user passwords

D Limiting database access

Directly inserting user input without checks can let attackers inject SQL code.

What can happen if SQL injection is successful?

A Improved database security

B Faster query execution

C Data theft or deletion

D Automatic data backup

Attackers can steal or delete data by exploiting SQL injection vulnerabilities.

Which input could be used in SQL injection to bypass login?

A password123

B SELECT * FROM users

C DROP TABLE users

D ' OR '1'='1

The input ' OR '1'='1 changes the query logic to always true, bypassing login checks.

Explain how SQL injection exploits a database query.

Think about how attackers use input fields to change what the database does.

Describe methods to prevent SQL injection attacks.

Focus on how to keep code and data separate in queries.