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 -------------------------------------------------------------------------- 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 -------------------------------------------------------------------------- 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 Oob-fix and Icmp-fix have been superseded by Teardrop2-fix.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 ============================================================================ 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. Copyright Microsoft Corporation 1997.