What is SQL injection?

SQL injection is a type of security vulnerability that occurs when an attacker injects malicious SQL code into a web application’s input fields, such as a login form or search box. The goal of the attack is to manipulate the database behind the web application and gain unauthorized access to sensitive data or perform unauthorized actions.

Here’s how SQL injection works:

1. The attacker identifies a vulnerable web application that uses SQL to interact with its database.

2. The attacker enters SQL commands into an input field, such as a search box. For example, the attacker may enter the following code into the search box:
` ‘ OR 1=1; — `

This simple code is designed to make the database execute the attacker’s malicious SQL code.

3. The web application fails to properly sanitize the input, allowing the attacker’s SQL code to be executed.

4. The attacker’s SQL code is executed by the database, which can allow the attacker to view, modify, or delete data from the database.

For example, the attacker may use SQL injection to bypass a login page by injecting code that always returns true for the login credentials. The attacker may also use SQL injection to extract sensitive data, such as credit card numbers, passwords, or other personal information.

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