What is a WAF (Web Application Firewall) and why your B2B web platform needs it

For companies that operate B2B portals, virtual stores or transactional SaaS platforms, web application security is a critical business factor. A simple logical flaw exploited by attackers can result in the leak of customer databases, theft of credit cards, or the complete hijacking of computer servers.

In this defensive architecture, the WAF (Web Application Firewall) is the first and most important line of defense against malicious external requests.

How Does a Web Application Firewall Work?

Unlike classic network firewalls that act as guards at the exterior door of a building verifying entry passes (IP addresses and ports), a WAF acts as an internal inspector that thoroughly analyzes the content of each HTTP or HTTPS packet that arrives at your web application (application layer or layer 7 of the OSI model).

The WAF analyzes requests for known patterns of logical exploits:

• SQL Injection (SQLi): Attempts to inject malicious database commands into form fields to extract private records.
• Cross-Site Scripting (XSS): Insertion of harmful Javascript scripts into legitimate web pages to steal session cookies from other users.
• Brute Force Attacks: Automated blocking of recurring login requests designed to guess corporate passwords.

WAF in the Cloud vs. Local WAF

• Cloud-Based WAF: Third-party providers redirect your website traffic through their reverse proxies before it reaches your real servers. They are easy to implement and automatically update their security rules against global zero-day vulnerabilities.
• Local WAF (on-premise): It is installed directly on the web server (such as Nginx or Apache). It offers full control over data traffic privacy but requires ongoing maintenance by specialized systems engineers.

Build your web platforms under the strictest defensive standards, integrating logical firewalls and clean code from its original design. Protect your business with our Secure Web Development service.