Getting started with WAF implementation

WAF stands for “Web Application Firewall” and is pronounced “waff.” It is a security measure designed to protect websites from attacks that exploit vulnerabilities in <span class="remark" data-id="Webapplications">web applications</span>.

What distinguishes a WAF from other security measures, such as firewalls and IPS? The key difference lies in what each technology is designed to protect.

A firewall acts as a “protective barrier” that safeguards internal networks from cyberattacks and unauthorized access.
It monitors elements such as the source IP address and port numbers, blocking suspicious or unauthorized communications. However, it does not inspect the content of the traffic that passes through.

IPS stands for “Intrusion Prevention System,” a security mechanism designed to prevent unauthorized access.
It protects against cyberattacks that exploit vulnerabilities in operating systems and middleware, as well as attacks targeting file-sharing services. Like firewalls, IPS does not inspect the content of the communication itself.

WAF blocks cyberattacks that have bypassed network-, OS-, and middleware-level security measures and reached the web application layer.
Unlike firewalls and IPS, a WAF inspects the content of communications and rejects traffic that is identified as malicious.

WAF can be broadly categorized into three types.

This is dedicated hardware equipped with WAF functionality. It is installed between the external network and the web server.
Implementing this type typically requires reviewing firewall settings and reconfiguring the network.

This type is installed directly on an existing web server or web application server.

This type does not require dedicated hardware or servers.

We have outlined the necessity of implementing a WAF, along with the characteristics of the three main types. By clarifying your current environment and budget, you can evaluate your options and choose the WAF that best fits your needs.