SQLi – SQL Injection is a type of cybersecurity vulnerability that allows attackers to manipulate and exploit a website or application's database by injecting malicious SQL (Structured Query Language) code. SQLi can lead to unauthorised access, data theft, and even complete control over the affected system.
Here’s a simple breakdown:
- How It Works:
- Many websites and applications rely on databases to store user information, such as login credentials or sensitive data.
- If an input field (e.g., login form or search bar) is not properly secured, attackers can enter malicious SQL code instead of valid input.
- The injected SQL code tricks the database into executing unintended commands, such as displaying confidential data or modifying database content.
- Key Risks of SQLi:
- Data Breach: Attackers can extract sensitive information like usernames, passwords, or financial records.
- Data Manipulation: Malicious actors can delete or modify database entries.
- System Compromise: In severe cases, attackers can gain administrative control over the application or server.
Why Is SQLi Dangerous?
SQL Injection is one of the most common and damaging web application vulnerabilities. It poses significant risks to both businesses and their users by compromising sensitive data and potentially exposing organisations to regulatory fines.
Common Use Cases of SQLi by Attackers:
- Stealing sensitive user data (e.g., credit card numbers).
- Bypassing authentication mechanisms to gain unauthorised access.
- Disrupting business operations by corrupting or deleting data.
How to Prevent SQLi:
- Input Validation: Ensure all user inputs are properly validated and sanitised.
- Parameterised Queries: Use prepared statements or parameterised queries to separate SQL code from user input.
- Regular Testing: Perform vulnerability scans and penetration testing to identify weaknesses.
- Web Application Firewalls (WAF): Deploy WAFs to block malicious SQL injection attempts.
Think of SQLi as a way for attackers to "pick the lock" on your database by exploiting vulnerabilities in how user input is handled. Proper coding practices and security measures are the "deadbolt" that can keep your system safe.
