Intro to Ffuf and how to use it, Try hack me tutorial
‘ffuf’ stands for ‘fuzz faster you fool!’
Its a web attack tool written in go and is like the burpsuite of the cli
to use it you need the input file you’re sending to the webapp and the location to be injected which is indicated with FUZZ
FINDING PAGES OR FILES IN THE ROOT OF A SITE
ffuff -c -w /put/the/path/to/list/here -u http://domainnamegoeshere/FUZZ
-u specifies the url and -w specifies the wordlist. Both -u and -w are the minimum options that we need to supply to ffuf.
-c is not imgant and just helps colourize the output making the results easier to see.
- make sure you have seclists installed.
- path to seclists in kali in /usr/share/seclists/
- you can use any keyword besides FUXX by defining it at the end of a wordlist.txt
ffuf -u http://weburl/FUZZ -w usr/share/seclists/Discovery/Web-Content/big.txt or ``usr/share/seclists/Discovery/Web-Content/web-extensions.txt
web extension enumeration
To enumerate through a giant file isnt always the best solution. Usually we can assume that index.<file extension name e.g txt/html> is the default page so we can from there determine the type of programming language used.
ffuf -u htttp://weburlgoeshere/indexFUZZ -w usr/share/seclists/Discovery/Web-Content/web-extentions.txt
Filtering out extensions
Ones we know the types of extensions supported by the webpage we can filter out the rest from a generic word lists using -e
Filtering out http status codes and other thingies
By using -fc 403 we can filter out all the output for the 403 http status code
by using -mc instead of fc we are asking it to match the specified code rather than filtering it out
to filter out the size of different responses we can use -fs
if we want to match all files we can use a regexo beginning with a dotf
ffuf -u http://10.10.196.129/FUZZ -w /usr/share/seclists/Discovery/Web-Content/raft-medium-files-lowercase.txt -fr '/\..*'
When we have the page or api endpoint and need to know the parameters that are accepted we can use fuxx
Finding a vuln parameter could lead us to xss,sql, path disclosure and command injection
To generate a wordlist and save a file containing integers, we can use -w -w which tells ffuf to read a wordlist from stdout
- stdout stands for standard output stream
this helps us in that lets us generate a list of integers with our command and pipe the output to fuff
$ ruby -e 'puts(0..255).to_a'| ffuf -u 'http://10.10.255.32/sqli-labs/Less-1/?id=FUZZ' -c-w - -fw 33
We could also use ffuf for word-list based brute force password attacks like we do with burpsuite
ffuff -u http://10.10.255.32/sqli-labs-Less-1/ -c -w /usr/share/seclists/Passwords/Leaked-Databased/hak5.txt -X POST -d 'uname=Dummy&passwd=FUZZ&SUBMIT=SUMBIT' -fs 1435 -H 'Content-Type:application/x-www-form-urlencoded'
Finding vhosts and subdomains
Fuff might not be as good as other tools to find subdomain enumaertion but its still doable
ffuff -u http://FUFFdomainhere.com -c -w /usr/share/seclists.Discover/DNS/subdomains-top1million-5000.txt
Some subdomains might not be able to be found by the dns and can only be found by resolving the targets network to their dns server.
proxing ffuf traffic
You can send all the ffuf traffic through a web proxy using http or SOCKSS, its also possible to send only matches to your proxy to reply
ffuff -u http://10.10.225.32/ -c -w /usr/share/seclists/Discover/Web-content common.txt -x http://127.0.0.1:8080
ffuff -u http://10.10.225.32/ -c -w /usr/share/seclists/Discover/Web-content common.txt -replay-proxy http://127.0.0.1:8080
saving output to a markdown file
-of md -o fuff.md