Skills Assessment - Web Fuzzing - Htb

At its core, the HTB Web Fuzzing assessment is an exercise in brute-forcing web resources. The primary objective is usually to uncover "hidden" endpoints—directories, files, or sub-domains—that are not intended for public access or indexing by standard search engines. The assessment typically begins with the foundational tool, gobuster , or similar alternatives like ffuf and feroxbuster . The student quickly learns that fuzzing is not merely about running a command; it is about context. A standard directory scan might yield nothing on a well-configured server, but a scan targeting specific file extensions (e.g., .php , .txt , or .bak ) using the -x flag can reveal backup configuration files or administrative panels. This distinction highlights a key educational outcome: the importance of specificity in fuzzing. The assessment forces the student to analyze the technology stack (identifying, for example, that a site runs on PHP) to tailor their fuzzing parameters accordingly.

To help tailor this guide for your specific laboratory environment, let me know:

Using the -fs (filter size) or -fc (filter code) flags in ffuf to weed out "false positives" (like 404 pages that return a 200 OK status). Phase 3: Parameter and Value Fuzzing

Replace value with a test string (e.g., admin or 1 ) to see how the server responds. htb skills assessment - web fuzzing

ffuf -u http://target.htb/indexFUZZ -w /usr/share/seclists/Discovery/Web-Content/web-extensions.txt

ffuf -w /usr/share/wordlists/seclists/Discovery/Web-Content/burp-parameter-names.txt -u http:// /page.php?FUZZ=test -fs [size] 4. Recursive Fuzzing

Once you find a page (like config.php ), it might be expecting a parameter you don't know about (e.g., ?file= or ?id= ). At its core, the HTB Web Fuzzing assessment

A common value discovered is getaccess , which points you toward a new vHost. 4. VHost & Subdomain Discovery

is the art of automated brute-forcing. Instead of guessing passwords, you are guessing:

If you find a page that does nothing, fuzz for hidden parameters. The student quickly learns that fuzzing is not

Many HTB environments hide the "real" application behind a Virtual Host. If you only fuzz the IP, you might see a default Apache page. Fuzzing the header allows you to discover internal-only subdomains like dev.target.htb Parameter Fuzzing (GET/POST): Once you find a page (e.g., config.php

If the server blocks .php , try fuzzing with .php5 , .phtml , or .phps to trick the server into displaying the source code rather than executing it.