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 subsequent fix
was completed on January 9, 1998 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
------------------

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

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

Windows NT 4.0 SP3
------------------

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

Oob-fix and Icmp-fix have been superseded by Teardrop2-fix.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/teardrop2-fix

This fix should have the following time stamp:

   01/09/98  08:16a               143,664 Tcpip.sys   (Intel)
   01/09/98  08:13a               263,536 Tcpip.sys   (Alpha)

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

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

This hotfix has been posted to the following Internet location:

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT351/
   hotfixes-postSP5/teardrop2-fix

This fix should have the following time stamp:

   01/14/98  12:04p               123,824 Tcpip.sys   (Intel)
   01/14/98  12:00p               216,848 Tcpip.sys   (Alpha)

STATUS
======

Windows NT 4.0
--------------

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

Windows NT 3.51
---------------

Microsoft has confirmed this to be a problem in Windows NT version 3.51. A
supported fix is now available, but is not 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 Product Support Services for more information.

Additional query words: prodnt 4.00 3.51 

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