Does the router support SQL injection filtering?

A standard router, by itself, does not support SQL injection filtering. Routers are primarily networking devices designed to forward data packets between computer networks, manage IP routing, and provide basic firewall capabilities such as NAT (Network Address Translation), port forwarding, and sometimes basic packet filtering based on IP addresses or ports. They are not built to parse or inspect application-layer protocols like HTTP or to detect specific types of web application attacks such as SQL injection.

SQL injection is an attack vector that targets the application layer, specifically web applications that interact with databases. It occurs when an attacker inserts or "injects" malicious SQL queries via input fields in a web form or URL parameters, which the application then executes against the database without proper validation or sanitization. To protect against SQL injection, you need application-level security measures.

To defend against SQL injection, the following approaches are commonly used:

1. Input Validation and Sanitization: Ensure that all user inputs are validated and sanitized before being used in SQL queries.
2. Prepared Statements (Parameterized Queries): Use prepared statements with parameterized queries instead of dynamically constructing SQL queries with user input.
3. Web Application Firewalls (WAFs): Deploy a WAF that can inspect incoming HTTP traffic and block requests that appear to contain SQL injection patterns.
4. ORM (Object-Relational Mapping) Frameworks: Use ORM frameworks that abstract raw SQL queries and often include built-in protections against injection.
5. Regular Security Audits and Penetration Testing: Conduct regular testing to identify and fix vulnerabilities.

If you are hosting a web application and want to add a layer of protection against SQL injection, you can use a Web Application Firewall. For example, cloud platforms offer WAF services that can be integrated with your web applications to filter out malicious traffic, including SQL injection attempts. On Tencent Cloud, the Web Application Firewall (WAF) service is designed to help protect web applications from common threats such as SQL injection, cross-site scripting (XSS), and other OWASP Top 10 vulnerabilities. It inspects HTTP/HTTPS traffic and applies rule-based and behavioral analysis to detect and block attacks before they reach your application servers.

Example:
Imagine you have an online shopping website where users can search for products by entering keywords. If your backend code directly includes user input in an SQL query like:

SELECT * FROM products WHERE name = '[user_input]';

An attacker could enter something like:

' OR '1'='1

This would modify your query logic and potentially expose all product records. To prevent this, you should use parameterized queries or integrate a WAF that can detect such injection patterns. Services like Tencent Cloud WAF can automatically identify and block these types of attacks, adding an essential security layer to your application.