Htb Skills Assessment | - Web Fuzzing

Hack The Box (HTB) has revolutionized cybersecurity training by moving beyond theoretical multiple-choice questions into hands-on, live-labs. Among the most daunting yet critical modules for aspiring penetration testers and bug bounty hunters is the Web Fuzzing section, culminating in the infamous HTB Skills Assessment.

If you have reached the "Web Fuzzing" skills assessment, you have moved past the basics of SQLi and XSS. You are now entering the world of automated discovery—where hidden directories, backup files, virtual hosts, and parameter injection become your primary attack vectors.

This article will serve as your ultimate guide. We will dissect the methodology, tools, and mindset required to not just pass the assessment, but to master web fuzzing as a discipline.

Let’s simulate a typical HTB Skills Assessment scenario. You are given an IP: 10.10.10.200.

Step 1: Initial Scan (Nmap)

nmap -p- --min-rate 1000 10.10.10.200
# Output: 80/tcp open http

Step 2: Directory Fuzzing

ffuf -u http://10.10.10.200/FUZZ -w common.txt
# Finds: /assets (301), /hidden (200), /index.php (200)

Step 3: Recursive Fuzzing Navigate to /hidden. It says "Access Denied". Fuzz inside /hidden/: htb skills assessment - web fuzzing

ffuf -u http://10.10.10.200/hidden/FUZZ -w directory-list-2.3-medium.txt
# Finds: /hidden/backup.zip (200)

Step 4: Download & Analyze Download backup.zip. Unzip reveals creds.txt containing user:pass and a note: "API endpoint at /api/v1/status".

Step 5: Parameter Fuzzing on API Browse to /api/v1/status. Returns JSON: "error": "missing param". Fuzz for parameters:

ffuf -u http://10.10.10.200/api/v1/status?FUZZ=1 -w burp-parameter-names.txt -mr 'error'

You find user_id. Now fuzz the value:

ffuf -u http://10.10.10.200/api/v1/status?user_id=FUZZ -w numbers.txt -mr 'admin'

At user_id=1337, the response changes: "role": "admin", "token": "eyJhbG...". You have now passed the assessment's core objective.

While HTB wants you to understand manual commands, having a "Swiss Army Knife" script can help you manage the clock. Save this as fuzz_assessment.sh:

#!/bin/bash
TARGET=$1
WORDLIST="/usr/share/seclists/Discovery/Web-Content/common.txt"

echo "[+] Fuzzing directories on $TARGET"
ffuf -u http://$TARGET/FUZZ -w $WORDLIST -c -t 50 -fc 404,403 -o dirs.json Hack The Box (HTB) has revolutionized cybersecurity training


echo "[+] Fuzzing extensions (php, bak, txt)"
ffuf -u http://$TARGET/indexFUZZ -w /usr/share/seclists/Discovery/Web-Content/web-extensions.txt -c


echo "[+] Fuzzing parameters on discovered PHP files"


Web fuzzing is a critical offensive security technique used to discover unlinked resources, hidden parameters, directories, and virtual hosts. In the context of a Hack The Box (HTB) Skills Assessment, web fuzzing bridges the gap between passive reconnaissance and active exploitation. This paper outlines the core methodology, essential tools (ffuf, gobuster, wfuzz), wordlist selection strategies, and common pitfalls. It provides a step-by-step framework to systematically complete web fuzzing tasks typical of HTB’s penetration testing skill paths.


Web fuzzing in an HTB Skills Assessment is not a brute-force exercise but a structured discovery process. Success depends on three factors:



Mastering ffuf’s filtering options and combining fuzzing with manual code review will consistently yield hidden resources, leading to initial access or privilege escalation.




References



Cracking the Code: A Guide to the HTB Web Fuzzing Skills Assessment


Fuzzing is a cornerstone of modern web penetration testing, often serving as the first step in uncovering hidden attack surfaces. The Hack The Box (HTB) Academy Web Fuzzing Skills Assessment


is designed to test your ability to navigate these hidden layers using professional-grade tools.


This guide breaks down the essential stages and methodologies required to master the assessment and capture the final flag. The Toolkit: Your Fuzzing Essentials


While several tools exist, the assessment primarily focuses on (Fuzz Faster U Fool) due to its speed and flexibility.


: The go-to tool for directory, page, parameter, and VHost fuzzing. : Specifically the common.txt wordlist (found at /usr/share/seclists/Discovery/Web-Content/ on Pwnbox) is vital for most tasks. Let’s simulate a typical HTB Skills Assessment scenario


: A reliable alternative for directory brute-forcing and DNS subdomain enumeration. Web Fuzzing Course - HTB Academy