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Simple Universal Fortigate Fuzzer

Simple Universal Fortigate Fuzzer
Posted May 15, 2023
Authored by Cody Sixteen

Simple python script to send commands prepared in text files mutated by an example payload string, e.g. multiple A or B letters. Using Fortigate's credentials, a user should be able to use this script to automate a basic fuzzing process for commands available in CLI.

tags | tool, python, fuzzer
SHA-256 | 183513f0d7a7bbd777a50826ac774d0cc927491384f081ad3ae5cf87426b640f

Simple Universal Fortigate Fuzzer

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c@ubuntu:~/LABS/_SUFLET2$ cat suff.py
#!/usr/bin/env python3
# suff.py -- simple universal fortigate fuzzer
#
# initial idea : xx.10.2022
# finished idea: xx.04.2023
#
# special thanks goes to Reykez (https://github.com/Reykez)
#
# for more details:
# https://code610.blogspot.com/2023/04/fuzzing-fortigate-7.html
#

from netmiko import Netmiko
import sys,os
import time
import paramiko


def readFile(filename):
words = []
fileText = open(filename.strip(), 'r')
for line in fileText.readlines():
for word in line.strip().split():
words.append(word.strip())
words.append('\n')
return words



##

def writeFile(words, filename):
text = '';

for word in words:
text += word;
if word!='\n':
text += ' ' ;

f = open(filename, 'w')
f.write(text)
f.close()

## run modified payload: send is as cfg:
fpread = open(filename, 'r')
lines = fpread.read()

command = lines

print("DEBUG :::: type of: %s" % type(command) )
print( command )
print("DEBUG :::: eof\n")

##
# set up for the target
fw_01 = {
'host':'192.168.56.231',
'username':'admin',
'password':'admin',
'device_type':'fortinet'

}

# connecting to the target host
try:
net_connect = Netmiko( **fw_01 )
print("+ connected, checking prompt...")
except paramiko.ssh_exception.SSHException as e:
print(" > connection error: %s" % e)

except ConnectionResetError as e:
print("> connection error2: %s" % e)

except UnboundLocalError as e:
print("UnboundLocalError: local variable 'net_connect' referenced before assignment")
print("> unbound variable error: %s" % e)

print("... sleeping 1...")
time.sleep(2)

print("> sending fuzzed command...")
send_init_cfg = net_connect.send_config_set( command ) # init_cfg...

print("+ looks like we just sent this command:\n\t%s\n\n" % send_init_cfg )



## finished fuzzed super-payload attack
##


####

def modifyFilename(filename, number):
name, extension = os.path.splitext(filename)
return "{name}{uid}{extension}".format(name=name, uid=str(number).zfill(2), extension=extension)

#### parse and validate command line args, proceed program



args = sys.argv[1:]
filename = args[0] if 0 in range(len(args)) else input ('Filename?')
textToReplace = args[1] if 1 in range(len(args)) else input ('text to replace? ')
outputBasename = args[2] if 2 in range(len(args)) else input ('output basename')

words = readFile(filename);

# reaplce any occurency and print
fileIndex = 0

for wordIndex in range(len(words)):
if words[wordIndex] == '\n':
continue
fileIndex += 1
wordsCopy = words.copy()
try:
wordsCopy[wordIndex] = textToReplace
writeFile(wordsCopy, modifyFilename(outputBasename, fileIndex ) )

except UnboundLocalError as e:
print("UnboundLocalError: local variable 'net_connect' referenced before assignment")
print("> unbound variable error: %s" % e)
pass


print('Successfully generated', modifyFilename(outputBasename, 1), '-', modifyFilename(outputBasename, fileIndex), ' files!')









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