The following is a Security Bulletin from the Microsoft Product Security
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Microsoft Security Bulletin (MS98-020)
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Patch Available for "Frame Spoof" Vulnerability
Originally Posted: December 23, 1998
Summary
=======
Microsoft has released a patch that fixes a vulnerability in Microsoft(r)
Internet Explorer(r) that could allow a malicious web site operator to
impersonate a window on a legitimate web site. The threat posed by this
vulnerability is that the bogus window could collect information from the
user and send it back to the malicious site.
A fully supported patch is available for this vulnerability, and Microsoft
recommends that all customers download and install it to protect their
computers.
Issue
=====
This vulnerability exists because Internet Explorer's cross domain
protection does not extend to navigation of frames. This makes it possible
for a malicious web site to insert content into a frame within another web
site's window. If done properly, the user might not be able to tell that
the frame contents were not from the legitimate site, and could be tricked
into providing personal data to the malicious site. Non-secure (HTTP) and
secure (HTTPS) sites are equally at risk from this vulnerability.
While there have not been any reports of customers being adversely affected
by these problems, Microsoft is releasing a patch to address any risks
posed by this issue.
Affected Software Versions
==========================
- Microsoft Internet Explorer versions 3.X, 4.0, 4.01,
4.01 Service Pack 1 for Windows 95
- Microsoft Internet Explorer versions 4.01 Service
Pack 1 for Windows 98
- Microsoft Internet Explorer versions 3.X, 4.0, 4.01,
4.01 Service Pack 1 for Windows NT 4.0
- Microsoft Internet Explorer versions 3.X, 4.0, 4.01
for Windows 3.1
- Microsoft Internet Explorer versions 3.X, 4.0, 4.01
for Windows NT 3.51
- Microsoft Internet Explorer versions 3.X, 4.X for Macintosh
- Microsoft Internet Explorer version 4 for UNIX on HPUX
- Microsoft Internet Explorer version 4 for UNIX on
Sun Solaris
No other products or versions of Internet Explorer are affected
What Microsoft is Doing
=======================
Microsoft has released a patch that fixes the problem identified. This patch
is available for download from the sites listed below in What Customers
Should Do.
Microsoft has sent this security bulletin to customers subscribing
to the Microsoft Product Security Notification Service (see
http://www.microsoft.com/security/services/bulletin.asp for more
information about this free customer service).
Microsoft has published the following Knowledge Base (KB) article on this
issue:
- Microsoft Knowledge Base (KB) article Q167614,
Update Available For "Frame Spoofing" Security Issue,
http://support.microsoft.com/support/kb/articles/q167/6/14.asp
(Note: It might take 24 hours from the original posting of
this bulletin for the updated KB article to be visible in
the Web-based Knowledge Base.)
What Customers Should Do
========================
Microsoft highly recommends that all affected customers download the updated
patch to protect their computers. The complete URL for each affected
software version is given below.
NOTE: The patch for the "Frame Spoof" Vulnerability also includes two
previously-released patches, for the "Untrusted Scripted Paste" and "Cross
Frame Navigate" vulnerabilities. Customers who have not yet downloaded and
installed these two patches need only download and apply the patch for the
"Frame Spoof" Vulnerability. Customers who have applied either or both of
patches should apply the patch for the "Frame Spoof" Vulnerability to
ensure that they have the latest protection against all three
vulnerabilities.
Windows 98
----------
Windows 98 customers can obtain the updated patch using Windows Update. To
obtain this patch using Windows Update, launch Windows Update from the
Windows Start Menu and click "Product Updates." When prompted, select 'Yes'
to allow Windows Update to determine whether this patch and other updates
are needed by your computer. If your computer does need this patch, you will
find it listed under the "Critical Updates" section of the page.
Internet Explorer 3.X and 4.0
-----------------------------
Internet Explorer 3.X and 4.0 users must first upgrade to Internet
Explorer 4.01 with Service Pack 1, which is available at
http://www.microsoft.com/windows/ie/download/. After installing
the upgrade, apply the Internet Explorer 4.01 patch as discussed below.
Internet Explorer 4.01
----------------------
Customers using Internet Explorer 4.01 (with or without Service
Pack 1) can obtain the patch from the Internet Explorer Security
web site, (http://www.microsoft.com/windows/ie/security/spoof.asp).
The patches for the Macintosh, HPUX and Solaris versions will be
slightly delayed. When they are available, a notice will be posted
on http://www.microsoft.com/ie/security/.
More Information
================
Please see the following references for more information related to this
issue.
- Microsoft Security Bulletin 98-020, Patch Available for "Frame
Spoof" Vulnerability (the Web-posted version of this bulletin),
http://www.microsoft.com/security/bulletins/ms98-020.asp.
- Microsoft Knowledge Base (KB) article Q167614,
Update Available For "Frame Spoof" Security Issue,
http://support.microsoft.com/support/kb/articles/q167/6/14.asp.
Acknowledgements
================
Microsoft wishes to acknowledge Juan Carlos Garcia Cuartango of Spain for
his continued assistance and input regarding variants of the Untrusted
Scripted Paste Issue.
Obtaining Support on this Issue
===============================
This is a supported patch. If you have problems installing
this patch or require technical assistance with this patch,
please contact Microsoft Technical Support. For information
on contacting Microsoft Technical Support, please see
http://support.microsoft.com/support/contact/default.asp.
Revisions
=========
- December 23, 1998: Bulletin Created
For additional security-related information about Microsoft products,
please visit http://www.microsoft.com/security
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