Microsoft Internet Explorer Sicherheitsluecke (fwd)

["H. Bork" <bork _at__ plb.de>]

Liebe Kolleginnen und Kollegen, 
vielleicht haben Sie ja das Beduerfnis, dass der Zugriff auf Ihre 
Dateien von aussen ueber das Internet nicht moeglich sein sollte.
>Falls< Sie den Internet Exploerer verwenden, koennte es sich dann
lohnen, den Text unten, der mich gerade erreichte, und die enthaltenen
weiterfuehrenden URLs zu lesen bzw. sich das geflickte Programm 
sicherheitshalber zu holen. Viele Gruesse, hbk ;-)

---------- Forwarded message ----------
Microsoft Security Bulletin (MS98-013)
- --------------------------------------------------------------------
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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