SQL Injection is a common security issue that allows attackers to manipulate database queries by injecting malicious SQL code. To prevent this, always use prepared statements and parameterized queries instead of directly inserting user inputs into SQL queries.
Example of Vulnerable Code (Unsafe)The above code is unsafe because an attacker can enter ' OR '1'='1 and retrieve all users' data.
Safe Code Using Prepared Statements (PHP & MySQLi)This method prevents SQL injection by ensuring that inputs are treated as values, not part of the SQL command.
Other security measures include:
Input Validation: Restrict input types to only expected values.
Escaping User Inputs: Use functions like mysqli_real_escape_string().
Least Privilege Principle: Limit database user permissions.
Use Web Application Firewalls: Prevent automated attacks.
By following these best practices, you can protect your application from SQL injection and other security threats
Example of Vulnerable Code (Unsafe)
CODE:
$userid = $_GET['id'];$query = "SELECT * FROM users WHERE id = '$userid'"; $result = mysqli_query($conn, $query);Safe Code Using Prepared Statements (PHP & MySQLi)
CODE:
$stmt = $conn->prepare("SELECT * FROM users WHERE id = ?");$stmt->bind_param("i", $userid);$stmt->execute();$result = $stmt->get_result();Other security measures include:
Input Validation: Restrict input types to only expected values.
Escaping User Inputs: Use functions like mysqli_real_escape_string().
Least Privilege Principle: Limit database user permissions.
Use Web Application Firewalls: Prevent automated attacks.
By following these best practices, you can protect your application from SQL injection and other security threats
Statistics: Posted by gorgebutler — Tue Feb 18, 2025 1:27 pm