[14975] in bugtraq
Microsoft Security Bulletin (MS00-029)
daemon@ATHENA.MIT.EDU (Microsoft Product Security)
Sat May 20 01:58:22 2000
Message-Id: <D1A11CCE78ADD111A35500805FD43F5867C2F9@RED-MSG-04>
Date: Fri, 19 May 2000 16:47:24 -0700
Reply-To: Microsoft Product Security <secnotif@MICROSOFT.COM>
From: Microsoft Product Security <secnotif@MICROSOFT.COM>
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Microsoft Security Bulletin (MS00-029)
- --------------------------------------
Patch Available for "IP Fragment Reassembly" Vulnerability
Originally Posted: May 19, 2000
Summary
=======
Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Windows(r) 95, Windows 98, Windows
NT(r) 4.0 and Windows 2000. The vulnerability could be used to cause
an affected machine to temporarily stop performing useful work.
Frequently asked questions regarding this vulnerability and
the patch can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-029.asp
Issue
=====
The affected systems contain a flaw in the code that performs IP
fragment reassembly. If a continuous stream of fragmented IP
datagrams with a particular malformation were sent to an affected
machine, it could be made to devote most or all of its CPU
availability to processing them. The data rate needed to completely
deny service varies depending on the machine and network conditions,
but in most cases even relatively moderate rates would suffice.
The vulnerability would not allow a malicious user to compromise data
on the machine or usurp administrative control over it. Although it
has been reported that the attack in some cases will cause an affected
machine to crash, affected machines in all Microsoft testing returned
to normal service shortly after the fragments stopped arriving.
Machines protected by a proxy server or a firewall that drops
fragmented packets would not be affected by this vulnerability. The
machines most likely to be affected by this vulnerability would be
machines located on the edge of a network such as web servers or proxy
servers.
Affected Software Versions
==========================
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows NT 4.0 Workstation
- Microsoft Windows NT 4.0 Server
- Microsoft Windows NT 4.0 Server, Enterprise Edition
- Microsoft Windows NT 4.0 Server, Terminal Server Edition
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Advanced Server
Patch Availability
==================
- Windows 95:
http://download.microsoft.com/download/win95/update/8070/
w95/EN-US/259728USA5.EXE
- Windows 98:
http://download.microsoft.com/download/win98/update/8070/
w98/EN-US/259728USA8.EXE
- Windows NT 4.0 Workstation, Server and Server, Enterprise
Edition:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20829
- Windows NT 4.0 Server, Terminal Server Edition:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20830
- Windows 2000 Professional, Server and Advanced Server:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20827
Note: Line breaks have been inserted into the URLs above for
readability.
Note: Additional security patches are available at the Microsoft
Download Center
More Information
================
Please see the following references for more information related to
this issue.
- Frequently Asked Questions: Microsoft Security Bulletin MS00-029,
http://www.microsoft.com/technet/security/bulletin/fq00-029.asp
- Microsoft Knowledge Base article Q259728 discusses this issue
and will be available soon.
- RFC 791, Internet Protocol,
http://www.ietf.org/rfc/rfc0791.txt?number=791
- Microsoft TechNet Security web site,
http://www.microsoft.com/technet/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 thanks Bindview's RAZOR Security Team
(http://www.bindview.com) for reporting this issue to us and working
with us to protect customers.
Revisions
=========
- May 19, 2000: Bulletin Created.
- ----------------------------------------------------
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Last updated May 19, 2000
(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.
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