WAF Fuzzing Scanner

Web Application Firewalls (WAFs) like the one this scanner checks are vital for securing web applications from various threats. They are deployed by organisations to protect web assets by filtering and monitoring HTTP traffic between a web application and the Internet. These firewalls detect and block threats such as SQL Injection, Cross-Site Scripting (XSS), and others, securing data from being exploited. Most modern WAFs are cloud-based and provide better scalability and flexibility. They help in meeting compliance requirements, ensuring that web applications are secure against emerging threats. By deploying robust WAFs, businesses protect their credibility and customer data.

The scanner specifically targets fuzzing vulnerabilities within WAF implementations. Fuzz testing involves inputting random data into applications to uncover potential weaknesses. WAFs, while designed to protect applications, may themselves have vulnerabilities in their rules and implementations. These vulnerabilities can potentially allow malicious payloads to bypass security filters. During fuzzing, the WAF is tested against unexpected inputs to determine its robustness. Identifying these vulnerabilities is crucial to enhance the WAF configurations.

The scanner injects a variety of payloads aiming to bypass or trigger false positives within the WAF. The payloads include SQL queries, script injections, and known bypass strings. It uses endpoints like HTTP GET and POST to deliver these payloads. Regex patterns help discern responses that indicate a WAF is in place or has been triggered. Understanding these patterns aids in deducing potential weak spots within the WAF setup.

If these vulnerabilities are exploited, attackers might successfully bypass the firewall, carry out attacks like SQLi or XSS, or even disrupt services. This could lead to data breaches, exposing sensitive user information. A compromised WAF can result in loss of customers’ trust and potential legal implications. Therefore, maintaining a well-configured and robust WAF is essential to ensure constant security. Regular testing and patching of WAFs can mitigate such risks.

REFERENCES

• https://github.com/Ekultek/WhatWaf