DOCUMENT:Q143478    [winnt]

TITLE   :Stop 0A in TCPIP.SYS When Receiving Out Of Band (OOB) Data

PRODUCT :Microsoft Windows NT

PROD/VER:3.51 4.00

OPER/SYS:WINDOWS

KEYWORDS:kbbug3.51 kbbug4.00 kbfile kbfix3.51 kbfix4.00 NTSrvWkst nttcp



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The information in this article applies to:



 - Microsoft Windows NT Workstation versions 3.51 and 4.0

 - Microsoft Windows NT Server versions 3.51 and 4.0

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SYMPTOMS

========



A Stop 0x0000000A occurs in Tcpip.sys when receiving Out of Band (OOB)

data.



CAUSE

=====



A sender specifies "Out of Band" data by setting the URGENT bit flag in the

TCP header. The receiver uses the URGENT POINTER to determine where in the

segment the urgent data ends. Windows NT bugchecks when the URGENT POINTER

points to the end of the frame and no normal data follows. Windows NT

expects normal data to follow.



RESOLUTION

==========



Microsoft has updated Tcpip.sys to correct the problem. Instructions for

installing it are available from Microsoft support channels, or directly

from the Internet locations below.



NOTE: This hotfix was originally posted on May 12, 1997. A second fix was

completed on May 21, 1997 to address another nearly identical attack and

this hotfix has replaced the original one. The original hotfix is included

in Windows NT 4.0 Service Pack 3. The most recent hotfix is not, however it

is available from the following Internet locations:



Windows NT 4.0 SP2

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



This hotfix has been posted to the following Internet location:



   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/

   hotfixes-postSP2/oob-fix



NOTE: Service pack 2 must be applied to Windows NT 4.0 prior to applying

this fix.



Windows NT 4.0 SP3

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



NOTE: Service pack 3 must be applied to Windows NT 4.0 prior to applying

this fix.



Oob-fix has been superseded by Icmp-fix. You can find the latest hotfix at

the following Microsoft ftp site:



   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/

   hotfixes-postSP3/icmp-fix



You can find the original hotfix at the following Microsoft ftp site:



   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/

   hotfixes-postSP3/archive/oob-fix



WARNING: If you install the original (archived) version of this hotfix

AFTER you apply the later version, your system may become unusable.

Microsoft does not recommend you install the original hotfix after applying

the later version.



Windows NT 3.51

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



This hotfix has been posted to the following Internet location:



   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT351/

   hotfixes-postSP5/oob-fix



NOTE: Service pack 5 must be applied to Windows NT 3.51 prior to applying

this fix.



STATUS

======



Microsoft has confirmed this to be a problem in Windows NT version 3.51 and 

4.0. A supported fix is now available, but has not been fully regression-tested

and should be applied only to systems experiencing this specific problem.

Unless you are severely impacted by this specific problem, Microsoft

recommends that you wait for the next Service Pack that contains this fix.

Contact Microsoft Technical Support for more information.



Additional query words: prodnt 4.00 3.51 



============================================================================



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