``` /'___\ /'___\ /'___\ /\ \__/ /\ \__/ __ __ /\ \__/ \ \ ,__\\ \ ,__\/\ \/\ \ \ \ ,__\ \ \ \_/ \ \ \_/\ \ \_\ \ \ \ \_/ \ \_\ \ \_\ \ \____/ \ \_\ \/_/ \/_/ \/___/ \/_/ ``` # ffuf - Fuzz Faster U Fool A fast web fuzzer written in Go. ## Installation - [Download](https://github.com/ffuf/ffuf/releases/latest) a prebuilt binary from [releases page](https://github.com/ffuf/ffuf/releases/latest), 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. ## Example usage ### Typical directory discovery [![asciicast](https://asciinema.org/a/211350.png)](https://asciinema.org/a/211350) 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](https://asciinema.org/a/211360.png)](https://asciinema.org/a/211360) 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" -u 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](https://gitlab.com/akihe/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](https://gitlab.com/akihe/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`). ``` Usage of ffuf: -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 -acc value Custom auto-calibration string. Can be used multiple times. Implies -ac -b "NAME1=VALUE1; NAME2=VALUE2" Cookie data "NAME1=VALUE1; NAME2=VALUE2" for copy as curl functionality. Results unpredictable when combined with -H "Cookie: ..." -c Colorize output. -compressed Dummy flag for copy as curl functionality (ignored) (default true) -cookie value Cookie data (alias of -b) -d string POST data -data string POST data (alias of -d) -data-ascii string POST data (alias of -d) -data-binary string POST data (alias of -d) -debug-log string Write all of the internal logging to the specified file. -e string Comma separated list of extensions to apply. Each extension provided will extend the wordlist entry once. Only extends a wordlist with (default) FUZZ keyword. -fc string Filter HTTP status codes from response. Comma separated list of codes and ranges -fl string Filter by amount of lines in response. Comma separated list of line counts 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 -i Dummy flag for copy as curl functionality (ignored) (default true) -input-cmd value 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 -maxtime int Maximum running time in seconds. (default 0 = inf.) -mc string Match HTTP status codes from respose, use "all" to match every response code. (default "200,204,301,302,307,401,403") -ml string Match amount of lines in response -mode string Multi-wordlist operation mode. Available modes: clusterbomb, pitchfork (default "clusterbomb") -mr string Match regexp -ms string Match HTTP response size -mw string Match amount of words in response -o string Write output to file -od string Directory path to store matched results to. -of string Output file format. Available formats: json, ejson, html, md, 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. Also stops on spurious 429 response codes. -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 -v Verbose output, printing full URL and redirect location (if any) with the results. -w value Wordlist file path and (optional) custom fuzz keyword, using colon as delimiter. Use file path '-' to read from standard input. Can be supplied multiple times. Format: '/path/to/wordlist:KEYWORD' -x string HTTP Proxy URL ``` eg. `ffuf -u https://example.org/FUZZ -w /path/to/wordlist` ## License ffuf is released under MIT license. See [LICENSE](https://github.com/ffuf/ffuf/blob/master/LICENSE).