[VulnWatch] KPMG-2002032: Macromedia Sitespring Cross Site Scripting

From: Peter Gründl (pgrundl@kpmg.dk)
Date: 07/17/02 

From: Peter Gründl <pgrundl@kpmg.dk>
To: "vulnwatch" <vulnwatch@vulnwatch.org>
Date: Wed, 17 Jul 2002 11:31:55 +0200

--------------------------------------------------------------------

Title: Macromedia Sitespring Cross Site Scripting

BUG-ID: 2002032
Released: 17th Jul 2002
--------------------------------------------------------------------

Problem:
========
A malicious user could use a default error page as the basis for a
cross site scripting attack.

Vulnerable:
===========
- Macromedia Sitespring V1.2.0(277.1) on Windows 2000 Server

Details:
========
The default HTTP 500 error script does not check the contents of the
error ticket (et) parameter before outputting it. That makes it
possible to inject eg. javascript in the URL.

http://server/error/500error.jsp?et=1>alert('KPMG')</script>

Vendor URL:
===========
You can visit the vendor webpage here: http://www.macromedia.com

Vendor response:
================
The vendor was notified on the 16th of April, 2002. The vendor has
since removed the trial software from the webpage. To our knowledge
there is no scheduled release date for a patch.

Additional notes:
=================
Quoted from the vendors webpage:

"We will continue to provide technical support for Sitespring
 through May 2004. Please continue to visit the Sitespring support
 center for TechNotes, white papers, and other product information.
 If you've purchased a technical support plan for Sitespring, we
 will continue to provide support pursuant to the terms of your
 support agreement. Even though we will not be selling annual
 Sitespring support packages, you can purchase incident-based
 support from a technical support engineer."

Corrective action:
==================
Replace the error script with a custom error page. If you do not
know how to create a .jsp file, simply create a standard 500 error
page in html, and rename it to .jsp.

Author: Peter Gründl (pgrundl@kpmg.dk)

--------------------------------------------------------------------
KPMG is not responsible for the misuse of the information we provide
through our security advisories. These advisories are a service to
the professional security community. In no event shall KPMG be lia-
ble for any consequences whatsoever arising out of or in connection
with the use or spread of this information.
--------------------------------------------------------------------

Relevant Pages