01 What is SQL Injection (SQLi)?
SQL Injection (SQLi) is a web security vulnerability that allows an attacker to interfere with the queries an application makes to its database.
This allows attackers to view data they are not normally able to retrieve (like other users' passwords), modify or delete data, or even gain administrative access to the database server.
The Query
An application builds a database query using user input.
The Breakout
The attacker enters characters (like ') that "break out" of the intended data field.
The Injection
They append malicious SQL commands that the database executes as valid instructions.
02 How It Works
Imagine a login query like this:
SELECT * FROM users WHERE username = '$user' AND password = '$pass';If an attacker enters admin' -- as the username, the query effectively becomes:
SELECT * FROM users WHERE username = 'admin' --' AND password = '...';The -- signifies a comment in SQL, so the rest of the query (the password check) is ignored. The attacker logs in as "admin" without a password.
Data Exfiltration
Attackers can use UNION SELECT statements to retrieve data from other tables, dumping your entire customer database.
Authentication Bypass
As shown above, simple logic errors can allow attackers to log in as any user, merely by manipulating SQL logic.
03 Prevention Strategies
SQL injection is 100% preventable. The key is to separate data from code.
1. Parameterized Queries (Prepared Statements)
This is the primary defense. Instead of concatenating strings, you use placeholders (like ? or $1). The database driver ensures that input is treated strictly as data, never as executable code.
2. Use an ORM (Object-Relational Mapping)
Modern ORMs like Prisma, TypeORM, or Sequelize use parameterized queries by default, significantly reducing the risk of accidental injection vulnerabilities.
3. Least Privilege
Ensure the database user your application uses has only the permissions it needs. If it doesn't need to drop tables, don't give it DROP permissions.
04 Detection Tools
Automated scanners can help you find SQL injection vulnerabilities before attackers do.
SQLMap
An open-source penetration testing tool that automates the process of detecting and exploiting SQL injection flaws.
LamaniSecure Scanner
Our own scanner checks for common misconfigurations and exposed endpoints that could be indicative of deeper vulnerabilities.
05 Frequently Asked Questions
Is SQL injection still a threat?
Yes. Despite being a known vulnerability for decades, SQL injection remains one of the most common and dangerous web vulnerabilities.
Do NoSQL databases prevent injection?
Not entirely. While traditional SQL injection doesn't apply, NoSQL databases are vulnerable to NoSQL injection attacks if input isn't validated.
Can't I just sanitize input?
Sanitization is helpful but error-prone. The gold standard for prevention is using parameterized queries (prepared statements), which separate code from data.
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