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securityvulnsSecurityvulnsSECURITYVULNS:DOC:217
HistoryMay 20, 2000 - 12:00 a.m.

Security Bulletin (MS00-029)

2000-05-2000:00:00
vulners.com
264
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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

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.

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.

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED
"AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL
WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES
WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL,
LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT
CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF
LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING
LIMITATION MAY NOT APPLY.

Last updated May 19, 2000

(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.

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