: Always filter out 404 responses with -fc 404 . If you notice a particular response size appears for all 404 pages, filter by size as well: -fs 1234 (where 1234 is the size of the typical 404 response). Use the -v flag initially to see what's happening, then refine your filters.
: Document every command you run, every directory you find, and every response size. This will help you avoid repeating work and will make it easier to backtrack if you miss something. htb skills assessment - web fuzzing
Once a page is discovered, you need to identify how it accepts input. : Always filter out 404 responses with -fc 404
Several tools are commonly used for web fuzzing, including: : Document every command you run, every directory
ffuf -w /usr/share/seclists/Discovery/DNS/subdomains-top1million-5000.txt -u http:// : / -H "Host: FUZZ. " -fs Use code with caution.
| Pitfall | Solution | | :--- | :--- | | | Verify VPN connection or switch to Pwnbox; some users have reported that packet filtering by ISPs can cause fuzzing to fail and suggest using VPN or alternative network. | | Not filtering results effectively | Always filter by response size ( -fs ), status code ( -fc ), or words ( -fw ) to reduce noise; otherwise you will be overwhelmed by identical error pages. | | Forgetting to update /etc/hosts | Virtual host fuzzing will fail without proper DNS resolution; always add discovered hosts to /etc/hosts before proceeding. | | Missing recursive scanning | Without recursion, you may miss nested directories; use -recursion flag to automatically explore deeper paths. | | Using the wrong wordlist | Stick to common.txt as specified in the assessment instructions; deviating from this wordlist may cause you to miss discoveries. | | Not verifying findings manually | Automated tools can produce false positives; always verify discovered paths manually via browser or curl . |
Fuzzing is the automated process of sending mass amounts of random or semi-random data (fuzz) to an application to see how it responds. In web penetration testing, fuzzing typically relies on predefined wordlists to guess valid resources. Key Targets of Web Fuzzing