Article –

SQL Injection is a type of security vulnerability that occurs when an attacker is able to insert or manipulate SQL queries in an application’s database. This can lead to unauthorized access, data breaches, and manipulation of the database.

What is SQL Injection?

SQL Injection (SQLi) is a code injection technique that exploits vulnerabilities in an application’s software by inserting malicious SQL statements into an entry field for execution. This typically happens when user inputs are not properly sanitized before being included in SQL queries.

How Does SQL Injection Work?

When user inputs are concatenated directly into SQL statements, attackers can craft inputs that alter the intended SQL command. For example, instead of entering a normal username, an attacker might input a statement that always evaluates to true, bypassing login authentication.

Common Types of SQL Injection

1. In-band SQLi: The attacker uses the same communication channel to launch the attack and gather results.
2. Inferential SQLi (Blind SQLi): No data is transferred via the vulnerable application, but the attacker sends payloads and observes the response and behavior.
3. Out-of-band SQLi: Data is retrieved using a different channel, such as an email or DNS request.

Consequences of SQL Injection

• Unauthorized viewing of data
• Data loss, corruption or deletion
• Executing administrative operations on the database
• BYPASSING authentication mechanisms
• Compromise of the underlying server or infrastructure

Prevention Methods

• Use of prepared statements (parameterized queries) to separate SQL code from user input.
• Employing stored procedures to restrict the structure of SQL queries.
• Validating and sanitizing all user inputs.
• Implementing least privilege access controls on the database.
• Using web application firewalls to detect and block suspicious queries.
• Regularly updating and patching database software and applications.

About The Author