Kali Linux

Firefly – Black Box Fuzzer For Web Applications

Firefly is an advanced black-box fuzzer and not just a standard asset discovery tool. Firefly provides the advantage of testing a target with a large number of built-in checks to detect behaviors in the target.

NOTE : Firefly is in a very new stage (v1.0) but works well for now, if the target does not contain too much dynamic content. Firefly still detects and filters dynamic changes, but not yet perfectly

Advantages

Heavy use of gorutines and internal hardware for great preformance
Built-in engine that handles each task for “x” response results inductively
Highly customized to handle more complex fuzzing
Filter options and request verification to avoid junk results
Friendly error and debug output
Build in payloads (default list are mixed with the wordlist from seclists)
Payload tampering and encoding functionality

Features

Installation

go install -v github.com/Brum3ns/firefly/cmd/firefly@latest

If the above install method do not work try the following:

git clone https://github.com/Brum3ns/firefly.git
cd firefly/
go build cmd/firefly/firefly.go
./firefly -h

Usage

Simple

firefly -h
firefly -u 'http://example.com/?query=FUZZ'

Advanced usage

Request

Different types of request input that can be used

Basic

firefly -u ‘http://example.com/?query=FUZZ’ –timeout 7000

Request with different methods and protocols

firefly -u ‘http://example.com/?query=FUZZ’ -m GET,POST,PUT -p https,http,ws

Pipeline

echo ‘http://example.com/?query=FUZZ’ | firefly

HTTP Raw

firefly -r '
GET /?query=FUZZ HTTP/1.1
Host: example.com
User-Agent: FireFly'

This will send the HTTP Raw and auto detect all GET and/or POST parameters to fuzz.

firefly -r '
POST /?A=1 HTTP/1.1
Host: example.com
User-Agent: Firefly
X-Host: FUZZ

B=2&C=3' -au replace

Request Verifier

Request verifier is the most important part. This feature let Firefly know the core behavior of the target your fuzz. It’s important to do quality over quantity. More verfiy requests will lead to better quality at the cost of internal hardware preformance (depending on your hardware)

 firefly -u 'http://example.com/?query=FUZZ' -e

Payloads

Payload can be highly customized and with a good core wordlist it’s possible to be able to fully adapt the payload wordlist within Firefly itself.

Payload debug

Display the format of all payloads and exit

firefly -show-payload

Tampers

List of all Tampers avalible

firefly -list-tamper

Tamper all paylodas with given type (More than one can be used separated by comma)

firefly -u ‘http://example.com/?query=FUZZ’ -e s2c

Encode

firefly -u ‘http://example.com/?query=FUZZ’ -e hex

Hex then URL encode all payloads

firefly -u ‘http://example.com/?query=FUZZ’ -e hex,url

Payload regex replace

firefly -u ‘http://example.com/?query=FUZZ’ -pr ‘\([0-9]+=[0-9]+\) => (13=(37-24))’

The Payloads: ' or (1=1)-- - and " or(20=20)or " Will result in: ' or (13=(37-24))-- - and " or(13=(37-24))or " Where the => (with spaces) inducate the “replace to”.

Filters

Filter options to filter/match requests that include a given rule.

Filter response to ignore (filter) status code 302 and line count 0

firefly -u ‘http://example.com/?query=FUZZ’ -fc 302 -fl 0

Filter responses to include (match) regex, and status code 200

firefly -u ‘http://example.com/?query=FUZZ’ -mr ‘[Ee]rror (at|on) line \d’ -mc 200

firefly -u ‘http://example.com/?query=FUZZ’ -mr ‘MySQL’ -mc 200

Preformance

Preformance and time delays to use for the request process

Threads / Concurrency

firefly -u ‘http://example.com/?query=FUZZ’ -t 35

Time Delay in millisecounds (ms) for each Concurrency

FireFly -u ‘http://example.com/?query=FUZZ’ -t 35 -dl 2000

Wordlists

Wordlist that contains the paylaods can be added separatly or extracted from a given folder

Single Wordlist with its attack type

firefly -u ‘http://example.com/?query=FUZZ’ -w wordlist.txt:fuzz

Extract all wordlists inside a folder. Attack type is depended on the suffix <type>_wordlist.txt

firefly -u ‘http://example.com/?query=FUZZ’ -w wl/

Example

Wordlists names inside folder wl :

fuzz_wordlist.txt
time_wordlist.txt

Output

JSON output is strongly recommended. This is because you can benefit from the jq tool to navigate throw the result and compare it.

(If Firefly is pipeline chained with other tools, standard plaintext may be a better choice.)

Simple plaintext output format

firefly -u ‘http://example.com/?query=FUZZ’ -o file.txt

JSON output format (recommended)

firefly -u ‘http://example.com/?query=FUZZ’ -oJ file.json

Community

Everyone in the community are allowed to suggest new features, improvements and/or add new payloads to Firefly just make a pull request or add a comment with your suggestions!

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