- Web Fuzzing — Htb Skills Assessment

The Hack The Box (HTB) Academy "Web Fuzzing" Skills Assessment is the final challenge in the Attacking Web Applications with Ffuf module. It requires applying techniques like directory discovery, subdomain fuzzing, and parameter fuzzing to find a hidden flag. Key Assessment Steps

Vhost/Subdomain Fuzzing: Identify hidden subdomains on the target IP (e.g., archive.academy.htb, test.academy.htb, faculty.academy.htb).

Tool Tip: Use ffuf with the -H "Host: FUZZ.academy.htb" header.

Directory & Extension Fuzzing: Scan the discovered subdomains for hidden directories and specific file extensions like .php, .phps, or .bak.

Common Find: Many users find a path such as /admin/panel.php.

Recursive Fuzzing: Use recursion (e.g., -recursion -recursion-depth 1) to dig deeper into identified folders.

Parameter & POST Fuzzing: Once a functional page is found, fuzz for accepted parameters (GET/POST) and then fuzz the values of those parameters to retrieve the flag. Common Troubleshooting Tips

Academy Skills Assessment - Web Fuzzing - Hack The Box :: Forums

HTB Skills Assessment - Web Fuzzing

Introduction

Web fuzzing is a crucial technique in web application security testing that involves sending a large number of inputs to a web application to discover hidden or unlinked resources, identify potential vulnerabilities, and understand the application's behavior under various conditions. As part of the Hack The Box (HTB) skills assessment, this challenge focuses on testing your proficiency in web fuzzing.

Objective

Your objective is to fuzz a given web application to discover as much information as possible, including but not limited to:

1. Directories and Files: Identify any directories or files that are not directly linked but are accessible through fuzzing.
2. Parameters and Possible Vulnerabilities: Discover hidden parameters, possible SQL injection points, cross-site scripting (XSS), and other vulnerabilities.
3. API Endpoints: If the application has API endpoints, identify them and understand their functionality.

Tools and Techniques

For this assessment, you are encouraged to use a variety of tools such as:

• Burp Suite (Intruder, Repeater, and Sequencer): For sending and analyzing large numbers of requests.
• DirBuster or DirTraversal: For directory and file fuzzing.
• Wfuzz: A web application fuzzer that can be used to identify vulnerabilities and enumerate web application components.
• ZAP (Zed Attack Proxy): An open-source web application security scanner for identifying vulnerabilities.

Methodology

1. Initial Scan: Begin with a basic scan using tools like Nmap or a simple web reconnaissance to understand the application's technology stack and open ports.
2. Directory and File Fuzzing: Use tools like DirBuster or wfuzz to enumerate directories and files.
3. Parameter Fuzzing: Look for parameters within the discovered files and directories. Tools like Burp Suite's Intruder can help here.
4. Vulnerability Identification: For each discovered component, test for common vulnerabilities such as SQL injection, XSS, command injection, etc.
5. Reporting: Document all findings, including any successful fuzzing results, potential vulnerabilities, and the tools/commands used.

Deliverables

Your submission should include:

1. A detailed report on your fuzzing process and findings. This should include:
   • A list of all directories, files, and parameters discovered.
   • Potential vulnerabilities identified, along with examples of payloads used to exploit them.
   • Screenshots or logs of your findings for verification.
2. A summary of your approach to the challenge and any insights gained.

Grading Criteria

• Effectiveness: The extent to which you were able to discover new information (directories, files, parameters) and potential vulnerabilities.
• Methodology and Approach: A clear and thorough approach to web fuzzing, including the tools chosen and why.
• Documentation: Clarity, completeness, and organization of your report.

Submission Guidelines

Please submit your report as a PDF document to [insert submission email/dropbox link]. Ensure your subject line reads: "HTB Skills Assessment - Web Fuzzing [Your Username]".

Additional Notes

• Ensure you have permission from Hack The Box to perform your assessment on their systems.
• Respect data privacy and only report vulnerabilities through official channels.

This challenge is designed to assess your hands-on skills in web application security testing, specifically in web fuzzing. Good luck!

The Web Fuzzing Skills Assessment on HTB Academy is the culminating challenge for the Web Fuzzing module. It requires you to apply automated discovery techniques to find hidden endpoints, subdomains, and parameters on a target system. Core Assessment Objectives

To successfully complete the assessment and retrieve the final flag, you must perform several layers of discovery:

Subdomain & VHost Fuzzing: Identify all active subdomains or virtual hosts (VHosts) associated with the target (e.g., *.academy.htb).

Extension Fuzzing: Determine which file extensions (like .php, .txt, .bak) are accepted by the server before deep-fuzzing for pages.

Recursive Directory Discovery: Use tools like ffuf to scan for hidden directories. Common findings often include an /admin/ directory containing sensitive files like index.php or panel.php. htb skills assessment - web fuzzing

Parameter & Value Fuzzing: Once you find a functional page, identify hidden parameters (e.g., ?accessID=) and fuzz their values to bypass access controls. Essential Tooling & Workflow

The assessment is designed to be solved using ffuf and the common.txt wordlist from SecLists. Example ffuf Command VHost Fuzzing

ffuf -w wordlist.txt -u http://TARGET_IP -H "Host: FUZZ.academy.htb" Directory Fuzzing ffuf -w common.txt -u http://SERVER_IP:PORT/FUZZ Recursive Fuzzing

ffuf -w common.txt -u http://URL/FUZZ -recursion -recursion-depth 1 Extension Fuzzing

ffuf -w wordlist.txt -u http://URL/indexFUZZ (where FUZZ is .php, etc.) Common Pitfalls & Tips

HTB Skills Assessment: Web Fuzzing

As a security enthusiast or a professional in the field of cybersecurity, you're likely no stranger to the concept of web fuzzing. Web fuzzing, also known as web application fuzzing, is a software testing technique used to discover security vulnerabilities and stability issues in web applications. It's an essential skill for any bug bounty hunter, penetration tester, or security researcher. In this article, we'll dive into the world of web fuzzing and explore how it can be used to enhance your skills in the field of cybersecurity.

What is Web Fuzzing?

Web fuzzing involves sending a large number of unexpected, malformed, or random data to a web application to observe its behavior. The goal is to identify potential security vulnerabilities, such as SQL injection, cross-site scripting (XSS), or command injection. Web fuzzing can also help you discover stability issues, such as crashes or errors, that could be exploited by an attacker.

Why is Web Fuzzing Important?

Web fuzzing is an essential skill for several reasons:

1. Discovering Security Vulnerabilities: Web fuzzing helps you identify potential security vulnerabilities in web applications. By sending unexpected data to a web application, you can discover vulnerabilities that may not be apparent through manual testing or other techniques.
2. Improving Application Security: Web fuzzing helps developers identify and fix security vulnerabilities before they can be exploited by attackers. By integrating web fuzzing into your testing workflow, you can ensure that your web applications are more secure and resilient to attacks.
3. Enhancing Bug Bounty Hunting: Web fuzzing is a valuable technique for bug bounty hunters. By using web fuzzing tools and techniques, you can identify potential security vulnerabilities and submit reports to bug bounty programs.

Getting Started with Web Fuzzing

To get started with web fuzzing, you'll need to choose a web fuzzing tool. Some popular options include:

1. Burp Suite: Burp Suite is a comprehensive web application security testing tool that includes a web fuzzer.
2. ZAP: ZAP (Zed Attack Proxy) is an open-source web application security scanner that includes a web fuzzer.
3. wfuzz: wfuzz is a popular open-source web fuzzer that allows you to fuzz web applications using a variety of techniques.

Basic Web Fuzzing Techniques

Once you've chosen a web fuzzing tool, you can start experimenting with basic web fuzzing techniques. Here are a few examples:

1. Parameter Fuzzing: Parameter fuzzing involves sending unexpected data to a web application's parameters. For example, you might send a string of random characters to a parameter instead of a valid input.
2. Header Fuzzing: Header fuzzing involves sending unexpected data to a web application's headers. For example, you might send a malformed HTTP header to a web application.
3. Cookie Fuzzing: Cookie fuzzing involves sending unexpected data to a web application's cookies. For example, you might send a malformed cookie value to a web application.

Advanced Web Fuzzing Techniques

As you gain more experience with web fuzzing, you can start experimenting with advanced techniques. Here are a few examples:

1. File Upload Fuzzing: File upload fuzzing involves sending malicious files to a web application's file upload functionality. For example, you might send a file with a malicious payload to a web application.
2. SQL Injection Fuzzing: SQL injection fuzzing involves sending malicious SQL queries to a web application's database. For example, you might send a SQL query with a malicious payload to a web application.
3. Cross-Site Scripting (XSS) Fuzzing: XSS fuzzing involves sending malicious JavaScript code to a web application's input fields. For example, you might send a JavaScript payload to a web application's search field.

HTB Skills Assessment: Web Fuzzing

Hack The Box (HTB) is a popular online platform that provides a range of cybersecurity challenges and assessments. The HTB skills assessment for web fuzzing is designed to test your skills in web application security testing. Here are some tips for completing the HTB skills assessment for web fuzzing:

1. Choose the Right Tools: Choose a web fuzzing tool that you're comfortable with and that meets the requirements of the assessment.
2. Understand the Target: Understand the target web application and its functionality. This will help you identify potential vulnerabilities and design effective fuzzing tests.
3. Start with Basic Techniques: Start with basic web fuzzing techniques, such as parameter fuzzing and header fuzzing.
4. Analyze Your Results: Analyze your results carefully and identify potential security vulnerabilities.

Conclusion

Web fuzzing is a valuable skill for any security enthusiast or professional in the field of cybersecurity. By using web fuzzing tools and techniques, you can identify potential security vulnerabilities in web applications and improve your skills in web application security testing. The HTB skills assessment for web fuzzing is a great way to test your skills and identify areas for improvement. With practice and experience, you can become proficient in web fuzzing and enhance your skills in the field of cybersecurity.

Additional Resources

• Hack The Box: www.hackthebox.eu
• Burp Suite: www.portswigger.net/burp
• ZAP: www.zaproxy.org
• wfuzz: wfuzz.readthedocs.io

FAQs

• What is web fuzzing?: Web fuzzing is a software testing technique used to discover security vulnerabilities and stability issues in web applications.
• Why is web fuzzing important?: Web fuzzing is important because it helps you identify potential security vulnerabilities in web applications and improve application security.
• What are some popular web fuzzing tools?: Popular web fuzzing tools include Burp Suite, ZAP, and wfuzz.

This skills assessment on Hack The Box (HTB) typically tests your ability to use fuzzing tools to discover hidden content, subdomains, and parameters on a target web application.

Since you're looking for a "text" (likely a walkthrough or a summary of the methodology), here is a structured guide on how to approach the assessment using tools like ffuf, wfuzz, or gobuster. 1. Directory & File Fuzzing

Your first goal is to map out the web server’s structure. You want to find hidden directories or files that aren't linked on the main page.

The Goal: Find administrative panels, backups (like .bak, .old), or configuration files. The Hack The Box (HTB) Academy "Web Fuzzing"

Key Command (ffuf):ffuf -w /usr/share/wordlists/dirb/common.txt -u http://:/FUZZ

Pro Tip: Always fuzz for extensions (e.g., -e .php,.html,.txt) to find functional scripts. 2. Subdomain & VHost Discovery

Sometimes the "flag" or the vulnerability is hidden on a different virtual host (like ://target.com or ://target.com).

VHost Fuzzing: Since you often don't have DNS control in HTB labs, you fuzz the Host Header.

Key Command:ffuf -w /usr/share/wordlists/seclists/Discovery/DNS/subdomains-top1million-5000.txt -u http://target.htb -H "Host: FUZZ.target.htb"

Filtering: Use -fs [size] to filter out "Default" page sizes that clutter your results. 3. Parameter Fuzzing (GET/POST)

Once you find a page (like config.php), it might be expecting a parameter you don't know about (e.g., ?file= or ?id=).

The Goal: Identify parameters that could lead to Local File Inclusion (LFI) or IDOR.

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

If you find a directory called /api, you should immediately fuzz inside that directory.

ffuf flag: Use -recursion and -recursion-depth 2 to automate this. Summary Checklist for the Assessment:

Identify the Target: Add the IP to your /etc/hosts file if a domain name is provided.

Basic Scan: Run a quick directory fuzz to find the "entry point."

VHost Check: Always check for subdomains if the main page looks like a dead end.

Parameter Hunting: If you find a page that does nothing, fuzz for hidden parameters.

Are you stuck on a specific question or flag within the assessment, or did you need a deeper explanation of the ffuf filters?

I’d be happy to help you with a Hack The Box (HTB) skills assessment focused on web fuzzing. However, I don’t have access to the specific live assessment or its unique flags/targets.

If you describe the type of web fuzzing involved (directory, parameter, virtual host, file extension, etc.) and share what you’ve tried so far (e.g., tools like ffuf, gobuster, wfuzz, dirb), I can:

• Explain the correct fuzzing methodology for that scenario
• Help interpret the response codes, sizes, or words that indicate a hit
• Suggest filters to reduce noise (-fc, -fs, -fw, -fr)
• Troubleshoot rate limiting, false positives, or authentication issues

Example helpful info I can provide (not task-specific, but generally useful for HTB web fuzzing):

• Directory fuzzing:
  ffuf -u http://target.com/FUZZ -w wordlist.txt -fc 404 -fs 0

• Extension fuzzing:
  ffuf -u http://target.com/indexFUZZ -w .txt,.php,.bak,.old -e

• VHost fuzzing:
  ffuf -u http://target.com/ -H "Host: FUZZ.target.com" -w subdomains.txt -fs <size>

• Parameter fuzzing (GET):
  ffuf -u http://target.com/page.php?FUZZ=test -w params.txt -fc 404

• Parameter fuzzing (POST):
  ffuf -u http://target.com/login -X POST -d "FUZZ=test" -w params.txt -fc 400

If you share a snippet of the assessment’s prompt (without revealing live flags/violating HTB rules), I can guide you without giving direct answers.

Let me know where you’re stuck — response code filtering, wordlist choice, or interpreting a false positive?

This report summarizes the methodology and findings for the Hack The Box (HTB) Academy - Web Fuzzing Skills Assessment. The assessment focuses on using ffuf (Fuzz Faster U Fool) to systematically discover hidden resources, virtual hosts, and parameters to uncover security vulnerabilities. 1. Executive Summary Directories and Files : Identify any directories or

The objective of this assessment was to perform a comprehensive security analysis of a target web application using automated fuzzing techniques. By moving through progressive layers of discovery—from subdomains to specific parameter values—multiple hidden endpoints were identified, eventually leading to the final flag. 2. Methodology & Tooling

The primary tool used was ffuf, supported by wordlists from the SecLists collection, specifically directory-list-2.3-small.txt, common.txt, and subdomains-top1million-5000.txt. Key ffuf Flags Reconnaissance VHost & Subdomain Fuzzing -H 'Host: FUZZ.domain.htb', -ms 0 Enumeration Directory & File Fuzzing -u http://target/FUZZ, -e .php,.txt Expansion Recursive Fuzzing -recursion, -recursion-depth 1 Exploitation Parameter & Value Fuzzing -X POST, -d 'param=FUZZ', -fs 3. Assessment Workflow & Findings Step 1: Virtual Host (VHost) Discovery

Initial testing on the base IP often returns restricted access (e.g., 403 Forbidden). VHost fuzzing was conducted to identify hidden sub-sites.

Command: ffuf -w subdomains-wordlist.txt -u http://TARGET_IP/ -H 'Host: FUZZ.academy.htb' -ms 0

Findings: Identified subdomains such as archive.academy.htb, faculty.academy.htb, and test.academy.htb. Step 2: Extension & Directory Enumeration

Before searching for pages, an extension scan determined which file types the server processes.

Key Discovery: Extensions like .php and .phps were found to be active.

Recursive Fuzzing: Using -recursion uncovered a multi-level directory structure, including /courses/linux-security.php7. Step 3: Parameter Fuzzing

On the identified admin or panel pages, fuzzing was used to find hidden GET/POST parameters. Command: ffuf -w wordlist.txt -u http://academy.htb -fs 798

Findings: Discovered the accepted parameter id and accessID. Step 4: Value Fuzzing & Flag Retrieval

The final step involved brute-forcing the specific values for identified parameters (e.g., finding the correct id number).

Action: Sent a POST request with the discovered value to retrieve the flag. Flag Format: HTB.... 4. Remediation Recommendations

To mitigate the risks identified during this assessment, the following security controls should be implemented:

Part 1: What is Web Fuzzing (In the Context of HTB)?

Before typing ffuf or gobuster, you must understand why HTB places such heavy emphasis on fuzzing.

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

• Directories & Files: admin.php, backup.zip, .git/HEAD.
• Parameters: ?id=1, ?debug=true, ?file=index.
• Virtual Hosts: admin.internal.htb, dev.target.com.
• Values: IDOR vulnerabilities (e.g., ?user_id=1001 -> 1002).

In the HTB ecosystem, the "Skills Assessment" is a purposefully vulnerable machine or web application. It combines multiple fuzzing techniques into a single narrative. You cannot pass it by running a single wordlist. You need a fuzzing workflow.

Matching for Success

• -mr "admin" (Match response containing "admin")
• -mc 200,301 (Only show these HTTP codes)
• -ms 1250 (Match response size exactly 1250 bytes)

Pro HTB Tip: Use -fs 0 and -fc 404 together to ignore redirect loops and missing pages. Then, when you see a single result, investigate manually.

3. Tool Selection and Setup

The HTB environment typically supports common Linux tools. ffuf is recommended for its speed and flexibility.

Phase 1: Directory & File Fuzzing (The Low-Hanging Fruit)

The assessment typically starts with an exposed web server (e.g., http://10.10.10.x). Your first task: Find the hidden entry point.

The Command:

ffuf -u http://target.htb/FUZZ -w /usr/share/seclists/Discovery/Web-Content/common.txt

What to look for:

• 200 OK (Standard directories)
• 301 Redirect (Often legitimate folders)
• 403 Forbidden (Don't ignore this—403 might still leak data or be bypassed later)

Pro Tip for the Assessment: If you see a 302 Found redirecting to a login page, fuzz further inside that directory. Example: http://target.htb/admin/FUZZ or http://target.htb/admin/backup/FUZZ.

4. Wordlist Strategy

HTB assessments often use custom or reduced wordlists. Always check available wordlists in the VM.

| Use Case | Recommended Wordlist | |----------|----------------------| | General directories | /usr/share/wordlists/dirb/common.txt | | Larger scope | /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt | | API endpoints | /usr/share/seclists/Discovery/Web-Content/api-words.txt | | Parameters | /usr/share/seclists/Discovery/Web-Content/burp-parameter-names.txt | | Extensions | .php, .bak, .old, .txt, .sql, .tar.gz |

Rule: Start small (common.txt), then expand if no results.

7. Common Pitfalls in HTB Assessments

| Pitfall | Consequence | Mitigation | |---------|-------------|-------------| | Not filtering false positives | Wasting time on 403/redirects | Use -fc, -fw, -fs | | Ignoring case sensitivity | Missing endpoints | Use -ic (ignore case) or -c for wordlists with case variants | | Fuzzing without authentication | Missing user-specific paths | Re-run fuzzing with session cookies | | Using wrong wordlist | No hits | Match wordlist to tech stack (ASP.NET, PHP, Node.js) | | Not recursing | Missing deeper paths | Add -recursion in ffuf |

6. Key Defensive Measures for Entertainment Companies

To mitigate risks identified via web fuzzing, the report recommends:

• Rate limiting & request throttling to slow automated fuzzing.
• Custom 404 response obfuscation (avoid distinguishing missing vs. forbidden resources).
• Robust access controls on hidden/admin paths (require IP whitelisting + MFA).
• Regular scanning using same wordlists attackers use (e.g., SecLists, raft).
• Remove backup files from production web roots.

5. Example Scenario from HTB Assessment

Scenario: A lifestyle blog platform (lifestyle.htb) hosts user-generated articles and premium wellness content. Fuzzing is required to locate a hidden administrative portal.

Steps demonstrated in assessment:

1. Initial directory fuzzing reveals /hidden_admin (403 Forbidden).
2. Extension fuzzing on /hidden_admin discovers /hidden_admin.zip (200 OK).
3. Download ZIP → contains config.php with database credentials.
4. Parameter fuzzing on the login form finds debug=true parameter revealing stack traces.
5. Result: Full compromise of user accounts and article database.