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ffuf - Fuzz Faster U Fool

A fast web fuzzer written in Go.

Heavily inspired by the great projects gobuster and wfuzz.

Features

  • Fast!
  • Allows fuzzing of HTTP header values, POST data, and different parts of URL, including GET parameter names and values
  • Silent mode (-s) for clean output that's easy to use in pipes to other processes.
  • Modularized architecture that allows integration with existing toolchains with reasonable effort
  • Easy-to-add filters and matchers (they are interoperable)

Example cases

Typical directory discovery

asciicast

By using the FUZZ keyword at the end of URL (-u):

ffuf -w /path/to/wordlist -u https://target/FUZZ

Virtual host discovery (without DNS records)

asciicast

Assuming that the default virtualhost response size is 4242 bytes, we can filter out all the responses of that size (-fs 4242)while fuzzing the Host - header:

ffuf -w /path/to/vhost/wordlist -u https://target -H "Host: FUZZ" -fs 4242

GET parameter fuzzing

GET parameter name fuzzing is very similar to directory discovery, and works by defining the FUZZ keyword as a part of the URL. This also assumes an response size of 4242 bytes for invalid GET parameter name.

ffuf -w /path/to/paramnames.txt -u https://target/script.php?FUZZ=test_value -fs 4242

If the parameter name is known, the values can be fuzzed the same way. This example assumes a wrong parameter value returning HTTP response code 401.

ffuf -w /path/to/values.txt -u https://target/script.php?valid_name=FUZZ -fc 401

POST data fuzzing

This is a very straightforward operation, again by using the FUZZ keyword. This example is fuzzing only part of the POST request. We're again filtering out the 401 responses.

ffuf -w /path/to/postdata.txt -X POST -d "username=admin\&password=FUZZ" https://target/login.php -fc 401

Using external mutator to produce test cases

For this example, we'll fuzz JSON data that's sent over POST. Radamsa is used as the mutator.

When --input-cmd is used, ffuf will display matches as their position. This same position value will be available for the callee as an environment variable $FFUF_NUM. We'll use this position value as the seed for the mutator. Files example1.txt and example2.txt contain valid JSON payloads. We are matching all the responses, but filtering out response code 400 - Bad request:

ffuf --input-cmd 'radamsa --seed $FFUF_NUM example1.txt example2.txt' -H "Content-Type: application/json" -X POST -u https://ffuf.io.fi/ -mc all -fc 400

It of course isn't very efficient to call the mutator for each payload, so we can also pre-generate the payloads, still using Radamsa as an example:

# Generate 1000 example payloads
radamsa -n 1000 -o %n.txt example1.txt example2.txt

# This results into files 1.txt ... 1000.txt
# Now we can just read the payload data in a loop from file for ffuf

ffuf --input-cmd 'cat $FFUF_NUM.txt' -H "Content-Type: application/json" -X POST -u https://ffuf.io.fi/ -mc all -fc 400

Usage

To define the test case for ffuf, use the keyword FUZZ anywhere in the URL (-u), headers (-H), or POST data (-d).

  -D	DirSearch style wordlist compatibility mode. Used in conjunction with -e flag. Replaces %EXT% in wordlist entry with each of the extensions provided by -e.
  -H "Name: Value"
    	Header "Name: Value", separated by colon. Multiple -H flags are accepted.
  -V	Show version information.
  -X string
    	HTTP method to use (default "GET")
  -ac
    	Automatically calibrate filtering options
  -i
      Dummy flag for copy as curl functionality (ignored)
  -b "NAME1=VALUE1; NAME2=VALUE2"
    	Cookie data "NAME1=VALUE1; NAME2=VALUE2" for copy as curl functionality.
    	Results unpredictable when combined with -H "Cookie: ..."
  -cookie
      Cookie data (alias of -b)
  -c	Colorize output.
  -compressed
    	Dummy flag for copy as curl functionality (ignored) (default true)
  -d string
    	POST data
  -data-ascii
      POST data (alias of -d)
  -data-binary
      POST data (alias of -d)
  -data string
    	POST data (alias of -d)
  -e string
    	Comma separated list of extensions to apply. Each extension provided will extend the wordlist entry once.
  -fc string
    	Filter HTTP status codes from response. Comma separated list of codes and ranges
  -fr string
    	Filter regexp
  -fs string
    	Filter HTTP response size. Comma separated list of sizes and ranges
  -fw string
    	Filter by amount of words in response. Comma separated list of word counts and ranges
  -input-cmd string
    	Command producing the input. --input-num is required when using this input method. Overrides -w.
  -input-num int
    	Number of inputs to test. Used in conjunction with --input-cmd. (default 100)
  -k	TLS identity verification
  -mc string
    	Match HTTP status codes from respose, use "all" to match every response code. (default "200,204,301,302,307,401,403")
  -mr string
    	Match regexp
  -ms string
    	Match HTTP response size
  -mw string
    	Match amount of words in response
  -o string
    	Write output to file
  -of string
    	Output file format. Available formats: json, csv, ecsv (default "json")
  -p delay
    	Seconds of delay between requests, or a range of random delay. For example "0.1" or "0.1-2.0"
  -r	Follow redirects
  -s	Do not print additional information (silent mode)
  -sa
    	Stop on all error cases. Implies -sf and -se
  -se
    	Stop on spurious errors
  -sf
    	Stop when > 95% of responses return 403 Forbidden
  -t int
    	Number of concurrent threads. (default 40)
  -timeout int
    	HTTP request timeout in seconds. (default 10)
  -u string
    	Target URL
  -w string
    	Wordlist file path or - to read from standard input
  -x string
    	HTTP Proxy URL

eg. ffuf -u https://example.org/FUZZ -w /path/to/wordlist

Installation

  • Download a prebuilt binary from releases page, unpack and run! or
  • If you have go compiler installed: go get github.com/ffuf/ffuf

The only dependency of ffuf is Go 1.11. No dependencies outside of Go standard library are needed.

Changelog

  • master

    • New
    • Changed
      • New CLI flag: -i, dummy flag that does nothing. for compatibility with copy as curl.
      • New CLI flag: -b/--cookie, cookie data for compatibility with copy as curl.
      • Filtering and matching by status code, response size or word count now allow using ranges in addition to single values

  • v0.10

    • New

      • New CLI flag: -ac to autocalibrate response size and word filters based on few preset URLs.
      • New CLI flag: -timeout to specify custom timeouts for all HTTP requests.
      • New CLI flag: --data for compatibility with copy as curl functionality of browsers.
      • New CLI flag: --compressed, dummy flag that does nothing. for compatibility with copy as curl.
      • New CLI flags: --input-cmd, and --input-num to handle input generation using external commands. Mutators for example. Environment variable FFUF_NUM will be updated on every call of the command.
      • When --input-cmd is used, display position instead of the payload in results. The output file (of all formats) will include the payload in addition to the position however.

    • Changed

      • Wordlist can also be read from standard input
      • Defining -d or --data implies POST method if -X doesn't set it to something else than GET

  • v0.9

    • New
      • New output file formats: CSV and eCSV (CSV with base64 encoded input field to avoid CSV breakage with payloads containing a comma)
      • New CLI flag to follow redirects
      • Erroring connections will be retried once
      • Error counter in status bar
      • New CLI flags: -se (stop on spurious errors) and -sa (stop on all errors, implies -se and -sf)
      • New CLI flags: -e to provide a list of extensions to add to wordlist entries, and -D to provide DirSearch wordlist format compatibility.
      • Wildcard option for response status code matcher.

  • v0.8

    • New
      • New CLI flag to write output to a file in JSON format
      • New CLI flag to stop on spurious 403 responses
    • Changed
      • Regex matching / filtering now matches the headers alongside of the response body

TODO

  • Tests!
  • Optional scope for redirects
  • Client / server architecture to queue jobs and fetch the results later
  • Fuzzing multiple values at the same time
  • Output module to push the results to an HTTP API