Fuzzing

Introduction

Fuzz testing or Fuzzing is a software testing technique which basically consists in finding implementation bugs using malformed/semi-malformed data injection in an automated fashion. Fuzzing techniques can also be used to discover vhosts, subdomains and web content

Web Application Content Fuzzing

Command	Description
ffuf -w wordlist.txt:FUZZ -u http://SERVER_IP:PORT/FUZZ	Directory Fuzzing
gobuster dir -u https://server:port -w wordlist	Directory Fuzzing
ffuf -w wordlist.txt:FUZZ -u http://SERVER_IP:PORT/indexFUZZ	Extension Fuzzing
ffuf -w wordlist.txt:FUZZ -u http://SERVER_IP:PORT/blog/FUZZ.php	Page Fuzzing
ffuf -w wordlist.txt:FUZZ -u http://SERVER_IP:PORT/FUZZ -recursion -recursion-depth 1 -e .php -v	Recursive Fuzzing

Sub-Domain Fuzzing

Command	Description
ffuf -w wordlist.txt:FUZZ -u https://FUZZ.server.com/	Sub-domain Fuzzing
gobuster dns -d example.com -w wordlists.txt	Sub-domain Fuzzing

VHost Fuzzing

Command	Description
ffuf -w wordlist.txt:FUZZ -u http://academy.htb:PORT/ -H 'Host: FUZZ.academy.htb' -fs xxx	VHost Fuzzing
gobuster vhost -u https://example:port -w wordlist	Gobuster VHost Fuzzing
gobuster vhost --url test.example --wordlist /usr/share/wordlists/seclists/Discovery/DNS/subdomains-top1million-5000.txt --append-domain	Better way - Gobuster Vhost Fuzzing

HTTP GET/POST Parameter Fuzzing

Command	Description
ffuf -w wordlist.txt:FUZZ -u http://server.com:PORT/admin/admin.php?FUZZ=key -fs xxx	Parameter Fuzzing - GET
ffuf -w wordlist.txt:FUZZ -u http://server.com:PORT/admin/admin.php -X POST -d 'FUZZ=key' -H 'Content-Type: application/x-www-form-urlencoded' -fs xxx	Parameter Fuzzing - POST
ffuf -w ids.txt:FUZZ -u http://server.com:PORT/admin/admin.php -X POST -d 'id=FUZZ' -H 'Content-Type: application/x-www-form-urlencoded' -fs xxx	Parameter Value Fuzzing

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Path traversal/File Inclusion Fuzzing

Command	Description
ffuf -w /path-to/burp-parameter-names.txt:FUZZ -u 'http://<SERVER_IP>:/index.php?FUZZ=value' -fs 2287	Fuzz page parameters
ffuf -w /path-to/LFI-Jhaddix.txt:FUZZ -u 'http://<SERVER_IP>:/index.php?language=FUZZ' -fs 2287	Fuzz LFI payloads
ffuf -w /path-to/default-web-root-directory-linux.txt:FUZZ -u 'http://<SERVER_IP>:/index.php?language=../../../../FUZZ/index.php' -fs 2287`	Fuzz webroot path
ffuf -w ./LFI-WordList-Linux:FUZZ -u 'http://<SERVER_IP>:/index.php?language=../../../../FUZZ' -fs 2287	Fuzz server configurations