Microsoft Security Bulletin (MS98-013)
FROM: Microsoft Product Security Response Team
TO: [email protected]
DATE: Fri, 4 Sep 1998 10:51:45 -0700
RE: Microsoft Security Bulletin (MS98-013)
Microsoft Security Bulletin (MS98-013)
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Fix available for Internet Explorer Cross Frame Navigate Vulnerability
Originally Posted: September 4, 1998
Last Revised: September 4, 1998
Summary
=======
Microsoft has released a patch that fixes a recently discovered issue
with the implementation of cross frame security in Microsoft Internet
Explorer. Customers using affected software listed below should download and
apply these patches as soon as possible.
Issue
=====
The Cross Frame Navigate issue involves a vulnerability in Internet
Explorer that could allow a malicious hacker to circumvent certain Internet
Explorer security safeguards. This vulnerability makes it possible for a
malicious Web site operator to read the contents of files on your computer.
While there have not been any reports of customers being adversely
affected by these problems, Microsoft is releasing these patches to address the
implied risks posed by these issues.
Affected Software Versions
==========================
The following software is affected by this vulnerability:
- Microsoft Internet Explorer 4.0, 4.01 and 4.01 SP1 on
Windows NT 4.0, Windows 95
- Microsoft Windows 98, with integrated Internet Explorer
(version 4.01 SP1)
- Microsoft Internet Explorer 4.0 and 4.01 for Windows 3.1
and Windows NT 3.51
- Microsoft Internet Explorer 4.0 and 4.01 for Macintosh
- Microsoft Internet Explorer 3.x
This vulnerability could also affect software that uses HTML
functionality provided by Internet Explorer. Anyone using such programs should
download the patch even if they do not run Internet Explorer as their default
browser.
What Microsoft is Doing
=======================
On September 4th Microsoft released a patch that fixes the problem
identified. This patch is available for download from the sites listed
below.
Microsoft has sent this security bulletin to customers subscribing to
the Microsoft Product Security Notification Service (see
http://www.microsoft.com/security/bulletin.htm for more information
about this free customer service).
Microsoft has published the following Knowledge Base (KB) articles on
this issue:
- Microsoft Knowledge Base (KB) article Q168485, Fix
available for Internet Explorer Cross Frame Navigate Vulnerability
http://support.microsoft.com/support/kb/articles/q168/4/85.asp
What customers should do
========================
Microsoft highly recommends that users of affected software versions,
listed in the "Affected Software Versions" section above, should download and
install the appropriate patch as soon as possible. Complete URLs for
each affected software version is given below.
Internet Explorer 4
-------------------
Customers using versions of Internet Explorer listed in the "Affected
Products" section can obtain the patch from the Internet Explorer
Security web site, http://www.microsoft.com/ie/security/xframe.htm
Windows 98
----------
Windows 98 customers can get the updated patch using the 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 Users
-------------------------
Users of Internet Explorer 3 should first upgrade to the latest version
of Internet Explorer 4 and then obtain the patch. Information on updating
to Internet Explorer 4 can be found from the Internet Explorer download
site http://www.microsoft.com/ie/download
Additional Details
==================
In addition to the product guidelines above, you can determine if you
have an affected version of mshtml.dll by following these instructions.
In Windows 98, Windows 95, and Windows NT 4.0
---------------------------------------------
>From the Start Menu select Find and choose Files or Folders.
1. In the Named box, type mshtml.dll.
2. In the Look in box, click the down arrow and choose local
hard drives from the list.
3. Click Find Now.
4. If mshtml.dll is not found, your system does not require
the patch.
5. If mshtml.dll is found, right-click the file, select
Properties, and then select the Version tab.
6. If the file version is less than 4.72.3509.0100, your system
could be affected and we recommend that you download the
patch. If the file version is greater than 4.72.3508.2400,
your system does not need the patch.
In Windows 3.1x
---------------
1. From the File Menu in File Manager, select Search.
2. In the Search For box, type mshtml16.dll.
3. In the Start From box, type your
[drive]:\[windows directory]\SYSTEM
(for example, C:\WINDOWS\SYSTEM).
4. Click OK.
5. If mshtml16.dll is not found, your system does not
require the patch.
6. If mshtml16.dll is found, click the file, press Alt-Enter,
and then check the Version information.
7. If the file version is equal to or less than 4.01.2509.0200,
your system could be affected and we recommend that you
download the patch. If the file version is greater than
4.01.2509.0200, your system does not need the patch.
On a Macintosh
--------------
1. In Internet Explorer, click the Apple icon and select About
Internet Explorer.
2. Look at the Internet Explorer version number in the bottom
left corner of the dialog box.
3. If the version is 4.01 (PowerPC) or 4.01 (68k), your system
could be affected and we recommend that you download the patch
for Internet Explorer 4.01.
4. If the version is 4.0, your system could be affected and we
recommend that you download Internet Explorer 4.01 and return
to this page to download the patch.
5. If the version is 4.01 (310), you already have the patch and
do not need to download it again.
More Information
================
Please see the following references for more information related to
this
issue:
- Microsoft Security Bulletin MS98-013, Fix available for
Internet Explorer Cross Frame Navigate Vulnerability,
(the Web posted version of this bulletin),
http://www.microsoft.com/security/bulletins/ms98-013.htm
- Internet Explorer Security Web site, Fix available for
Internet Explorer Cross Frame Navigate Vulnerability,
http://www.microsoft.com/ie/security/xframe.htm
- Microsoft Knowledge Base (KB) article Q168485, Fix available
for Internet Explorer Cross Frame Navigate Vulnerability
http://support.microsoft.com/support/kb/articles/q168/4/85.asp
Acknowledgements
================
Microsoft wishes to acknowledge the contributions of Georgi Guninski for originally reporting this problem.
Revisions
=========
- September 4, 1998: Bulletin Created
For additional security-related information about Microsoft products,
please visit http://www.microsoft.com/security
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