RE: Microsoft Security Bulletin MS03-028: Flaw in ISA S erver Error Pages Could Allow Cross-Site Scripting Attack (Q816456)
- From: "Rogers, Brian" <RogersB@xxxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 16 Jul 2003 18:30:24 -0400
Love how that fix doesn't bother to tell you its going to stop all your
services as soon as you accept the EULA.
Nice little tidbit of information id like to have prior to it happening.
-----Original Message-----
From: Greg Mulholland [mailto:gmulholland@xxxxxxxxxxxxxxx]
Sent: Wednesday, July 16, 2003 5:45 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Microsoft Security Bulletin MS03-028: Flaw in ISA Server
Error Pages Could Allow Cross-Site Scripting Attack (Q816456)
http://www.ISAserver.org
- - ---------------------------------------------------------------
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.
- - ---------------------------------------------------------------
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