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  ISA Server - Error Page Cross Site Scripting

  Microsoft Security Bulletin MS03-028: Flaw in ISA Server Error Pages Could Allow Cross-Site Scripting Attack (Q816456)

From:MICROSOFT <secure_(at)_microsoft.com>
Date:17.07.2003
Subject:Microsoft Security Bulletin MS03-028: Flaw in ISA Server Error Pages Could Allow Cross-Site Scripting Attack (Q816456)

-----BEGIN PGP SIGNED MESSAGE-----

- - ---------------------------------------------------------------
Title:      Flaw in ISA Server Error Pages Could Allow Cross-Site
           Scripting Attack (816456)
Date:       16 July 2003
Software:   Microsoft(r) ISA Server        
Max Risk:   Important
Bulletin:   MS03-028

Microsoft encourages customers to review the Security Bulletins         
at:
http://www.microsoft.com/technet/security/bulletin/MS03-028.asp
http://www.microsoft.com/security/security_bulletins/ms03-028.asp
- - ---------------------------------------------------------------

Issue:
======

ISA Server contains a number of HTML-based error pages that allow
the server to respond to a client requesting a Web resource with
a customized error. A cross-site scripting vulnerability exists
in many of these error pages that are returned by ISA Server
under specific error conditions.

To exploit this flaw, an attacker would have to first be aware of
a specific ISA server and its access policies or host an ISA
server of their own and create specific access policies designed
to exploit this vulnerability. The attacker could then craft a
request to trigger a page refusal. Once the attack was crafted,
the attacker would have to host a Web site containing the link,
or send the link to the user in the form of an HTML e-mail. After
the user previewed or opened the e-mail, the malicious site could
be visited automatically without further user interaction. In the
Web-based attack scenario, an attacker would have no way to force
a user to visit the Web site.

Mitigating factors:
====================

- The vulnerability could only be exploited if the attacker
could entice another user into visiting a Web page and clicking a
link on it, or opening an HTML-based e-mail.

- The request must be one that would cause the ISA server to
respond with one of several affected error pages.

- The vulnerability would not normally enable an attacker to
gain any privileges on an affected ISA Server computer, breach
the firewall, or compromise any cached content, unless the user
is operating on the ISA server itself and is using the Web Proxy
service to access the Internet.

Risk Rating:
============
Important

Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read
the  Security Bulletins at
  
http://www.microsoft.com/technet/security/bulletin/ms03-028.asp
http://www.microsoft.com/security/security_bulletins/ms03-028.asp
  
  for information on obtaining this patch.


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

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT
DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING
THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS
BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT,
INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL
DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT
ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL
OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

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