Blind SQLi is a type of SQL injection attack where an attacker exploits a vulnerability in a web application to extract sensitive information from a database without being able to directly see the data. This type of attack is known as “blind” because the attacker cannot see the actual database content

Preventing SQL injection vulnerabilities is crucial for ensuring the security and integrity of your database and application. Here are some best practices to help mitigate the risk of SQL injection attacks:

1. Use Parameterized Queries or Prepared Statements: Instead of directly embedding user input into SQL statements, use parameterized queries or prepared statements provided by your programming language or framework. These mechanisms separate the SQL code from the user input and automatically handle proper escaping or binding of parameters, preventing SQL injection.
2. Sanitize and Validate User Input: Before using user input in SQL queries, validate and sanitize the input. Implement strict input validation to ensure that only expected and valid values are accepted. Use whitelisting and proper data validation techniques to reject any input that does not meet the expected format or criteria.
3. Limit Database Permissions: Assign limited and appropriate privileges to database accounts used by your application. Restrict access to only the necessary tables, columns, and operations required for the application’s functionality. This helps minimize the potential damage an attacker can cause if a SQL injection vulnerability is exploited.
4. Implement Least Privilege Principle: Follow the principle of least privilege for your application’s database connection. Use a dedicated database account with limited privileges, rather than relying on high-level accounts such as the database administrator (DBA) account.
5. Avoid Dynamic SQL: Avoid constructing SQL queries dynamically by concatenating user input or other dynamic values directly into the query string. Dynamic SQL is harder to validate and secure. If dynamic queries are necessary, ensure proper sanitization and parameter binding.
6. Input Validation on Server-Side and Client-Side: While client-side input validation can enhance the user experience, it should not be solely relied upon for security. Perform thorough input validation and sanitization on the server-side as well to prevent any malicious input from reaching the database.
7. Regularly Update and Patch: Keep your database management system (DBMS), application framework, and libraries up to date with the latest security patches. Vendors often release updates to address known vulnerabilities and strengthen security measures.
8. Employ Web Application Firewalls (WAF): Consider using a Web Application Firewall to add an additional layer of protection. WAFs can help detect and block SQL injection attempts by inspecting and filtering incoming HTTP requests.
9. Educate Developers: Provide proper training and awareness to your development team about the risks and techniques associated with SQL injection attacks. Encourage secure coding practices, such as parameterized queries, input validation, and secure coding guidelines.

• The only sure way to prevent SQL Injection attacks is input validation and parametrized queries including prepared statements.
• application code should never use the input directly.
• The developer must sanitize all input, not only web form inputs such as login forms.