<0_26139_08CDB7E2-5BA3-4D94-877A-B5B987E21B02_US@Newsle
tters.Microsoft
.com>
To: <[EMAIL PROTECTED]>
Subject: Microsoft Security Bulletin MS02-009
Date: Thu, 21 Feb 2002 18:22:56 -0800
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Title: Incorrect VBScript Handling in IE can Allow
Web Pages to
Read Local Files
Date: 21 February 2002
Software: Internet Explorer
Impact: Information Disclosure
Max Risk: Critical
Bulletin: MS02-009
Microsoft encourages customers to review the Security
Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS02
-009.asp.
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Issue:
======
Frames are used in Internet Explorer to provide for a
fuller
browsing experience. By design, scripts in the frame of
one site or
domain should be prohibited from accessing the content
of frames
in another site or domain. However, a flaw exists in
how VBScript
is handled in IE relating to validating cross-domain
access. This
flaw can allow scripts of one domain to access the
contents of
another domain in a frame.
A malicious user could exploit this vulnerability by
using
scripting to extract the contents of frames in other
domains,
then sending that content back to their web site. This
would
enable the attacker to view files on the user's local
machine
or capture the contents of third-party web sites the
user visited
after leaving the attacker's site. The latter scenario
could,
in the worst case, enable the attacker to learn
personal
information like user names, passwords, or credit card
information.
In both cases, the user would either have to go to a
site under
the attacker's control or view an HTML email sent by
the attacker.
In addition, the attacker would have to know the exact
name and
location of any files on the user's system. Further,
the attacker
could only gain access to files that can be displayed
in a browser
window, such as text files, HTML files, or image files.
Mitigating Factors:
====================
- The vulnerability could only be used to view files.
It could not
be used to create, delete, modify or execute them.
- The vulnerability would only allow an attacker to
read files that
can be opened in a browser window, such as image
files, HTML
files and text files. Other file types, such as
binary files,
executable files, Word documents, and so forth,
could not be read.
- The attacker would need to specify the exact name
and location of
the file in order to read it.
- The email-borne attack scenario would be blocked if
the user were
using any of the following: Outlook 98 or 2000 with
the Outlook
Email Security Update installed; Outlook 2002; or
Outlook
Express 6.
Risk Rating:
============
- Internet systems: Moderate
- Intranet systems: Moderate
- Client systems: Critical
Patch Availability:
===================
- A patch is available to fix this vulnerability.
Please read the
Security Bulletin at
http://www.microsoft.com/technet/security/bulletin/ms02
-009.asp
for information on obtaining this patch.
Acknowledgment:
===============
- Zentai Peter Aron, Ivy Hungary Ltd
(http://w3.ivy.hu/)
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