401&403 bypass HTTP method/headers fuzzing

What is the "401&403 bypass HTTP method/headers fuzzing" module?

The "401&403 bypass HTTP method/headers fuzzing" module is designed to detect misconfigurations and vulnerabilities related to HTTP methods and headers. It targets web servers and aims to identify potential bypasses for 401 and 403 status codes. This module can help identify security weaknesses that could potentially allow unauthorized access to restricted resources.

This module is of moderate severity as it can potentially expose sensitive information or allow unauthorized access to protected resources.

Impact

If a bypass is successfully identified, it could lead to unauthorized access to restricted resources or sensitive information. This can have serious implications for the security and integrity of the targeted system.

How does the module work?

The module works by sending HTTP requests with various methods and headers to the target web server. It then analyzes the server's response and checks for specific status codes, such as 200, 500, 400, 302, 301, and 204. These status codes indicate potential vulnerabilities or misconfigurations.

For example, the module may send a GET request with the following headers:

GET {%BasePath%} HTTP/1.1
Host: {%Hostname%}
User-Agent: {%user_agent_custom%}
Accept: */*
Accept-Encoding: gzip, deflate, br
Connection: keep-alive

The module also includes a list of predefined user agent strings that are used in the requests. These user agent strings simulate different client environments and can help identify vulnerabilities specific to certain user agents.

The matching condition for this module is based on the status codes returned by the server. If any of the specified status codes (200, 500, 400, 302, 301, or 204) are detected in the server's response, the module considers it a potential vulnerability or misconfiguration.

By analyzing the responses and matching conditions, the module can provide valuable insights into the security posture of the target web server.