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TUCoPS :: Windows Net Apps :: ciacj070.txt

Microsoft Win 96 98 Telnet Client Vulnerability




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             __________________________________________________________

                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

              Microsoft Windows 95 and 98 Telnet Client Vulnerability

September 24, 1999 21:00 GMT                                      Number J-070
______________________________________________________________________________
PROBLEM:       A vulnerability was identified with the Telnet client that
               ships as part of Microsoft Windows 95 and 98 that may
               allow a web page visited by the user to run arbitrary code on
               the user's computer.
PLATFORM:      Microsoft Windows 95, 98, and 98 Second Edition.
DAMAGE:        A classic buffer overflow may allow arbitrary code to be
               executed on the user's computer.
SOLUTION:      Apply the available patches.
______________________________________________________________________________
VULNERABILITY  The risk is low. A user would have to visit a web site and view
ASSESSMENT:    a web page especially constructed to exploit this
               vulnerability.
______________________________________________________________________________

[Start Microsoft Advisory]

Microsoft Security Bulletin (MS99-033)
- --------------------------------------

Patch Available for "Malformed Telnet Argument" Vulnerability
Originally Posted: September 09, 1999

Summary
=======
Microsoft has released a patch that eliminates a vulnerability in the Telnet
client that ships as  part of Microsoft(r) Windows(r) 95 and 98. The
vulnerability could allow arbitrary code to be  executed on the user's
computer.

Frequently asked questions regarding this vulnerability can be found at
http://www.microsoft.com/security/bulletins/MS99-033faq.asp

Issue
=====
The Telnet client that ships as part of Windows 95 and 98 has an unchecked
buffer. A  specially-malformed argument could be passed to the client via a
web page in order to cause  arbitrary code to execute on the computer via a
classic buffer overrun technique.

Affected Software Versions
==========================
 - Microsoft Windows 95
 - Microsoft Windows 98
 - Microsoft Windows 98 Second Edition

Patch Availability
==================
 - Microsoft Windows 95
   http://www.microsoft.com/windows95/downloads/contents/
   WUCritical/Telnet/Default.asp
 - Microsoft Windows 98 and Windows 98 Second Edition
   http://www.microsoft.com/windows98/downloads/contents/
   WUCritical/Telnet/Default.asp

NOTE: Line breaks have been inserted into the above URLs for readability

NOTE: This patch also will be available via WindowsUpdate
(www.microsoft.com/windowsupdate) circa September 10, 1999.

More Information
================
Please see the following references for more information related to this
issue.
 - Microsoft Security Bulletin MS99-033: Frequently Asked Questions,
   http://www.microsoft.com/security/bulletins/MS99-033faq.asp.
 - Microsoft Knowledge Base (KB) article Q240163,
   Buffer Overrun in Telnet in Windows 98 Poses a Security Risk,
   http://support.microsoft.com/support/kb/articles/q240/1/63.asp.
   (Note: It may take 24 hours from the original posting of this
   bulletin for the KB article to be visible.)
 - Microsoft Security Advisor web site,
   http://www.microsoft.com/security/default.asp.

Obtaining Support on this Issue
===============================
This is a fully supported patch. Information on contacting Microsoft
Technical Support is available at
http://support.microsoft.com/support/contact/default.asp.

Acknowledgments
===============
Microsoft acknowledges Jeremy Kothe for bringing this issue to our
attention.

Revisions
=========
 - September 09, 1999: Bulletin Created.

- ------------------------------------------------------------------

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS"
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(c) 1999 Microsoft Corporation. All rights reserved. Terms of Use.

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[End Microsoft Advisory]
______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Microsoft Corporation for the
information contained in this bulletin.
______________________________________________________________________________


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