(From Listowner: This is one you really need to download and install! The information that Microsoft puts out is "for the birds"! Those "gomers" just won't admit the fact that there ARE serious flaws in ALL MS products when it comes to security! It really ticks me off when they make a statement like this: "Machines protected by a proxy server or a firewall that drops fragmented packets would not be affected by this vulnerability." That's a bunch of bull! My machine is protected by an excellent "firewall", ZoneAlarm. Yet, this "IP Fragment Assembly" got me early Friday morning. I awoke to see the "Blue Screen of Death". ZoneAlarm tried to prevent it, but even the best firewall can't handle EVERYTHING that MS forgot to include in Windows! We just have to wait and hope that MS "wakes up" and "gets it". BTW, I just had to reboot to get back to normal.) (In this forwarded email, you can't click on the links that are provided; you have to highlight and copy them, then paste into the address space in your web browser.) SgtGeorge ************************* The following is a Security Bulletin from the Microsoft Product Security Notification Service. Please do not reply to this message, as it was sent from an unattended mailbox. ******************************** -----BEGIN PGP SIGNED MESSAGE----- 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. - ---------------------------------------------------- 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. 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