DOCUMENT:Q275567 15-MAY-2002 [winnt] TITLE :MS00-091: Multiple NetBT Sessions May Hang Local Host PRODUCT :Microsoft Windows NT PROD/VER::4.0,4.0 SP4,4.0 SP5,4.0 SP6,4.0a,4.5 OPER/SYS: KEYWORDS:kbnetwork kbSecurity MSGRAPH kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerabilit ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 - Microsoft Windows NT Server, Enterprise Edition version 4.0 - Microsoft Windows NT Server versions 4.0, 4.0 SP4, 4.0 SP5, 4.0 SP6, Terminal Server Edition - Microsoft Windows NT Workstation version 4.0 - Microsoft Windows 98 Second Edition - Microsoft Windows 98 - Microsoft Windows 95 - Microsoft BackOffice Server versions 4.0, 4.5 - Microsoft BackOffice Small Business Server versions 4.0, 4.0a, 4.5 ------------------------------------------------------------------------------- SYMPTOMS ======== After a remote computer creates multiple TCP/IP connections with a local host and establishes a NetBIOS over TCP/IP (NetBT) session by using port 139, when the remote computer does not properly initiate a session closure for each open connection, the local host may stop responding (hang). Note that this issue does not affect computers that are running Microsoft Windows 2000. RESOLUTION ========== Windows NT 4.0; BackOffice Server 4.0 and 4.5; and BackOffice Small Business Server 4.0, 4.0a, and 4.5 ------------------------------------------------------------------------------------------------------ To resolve this problem, obtain the individual package referenced below or obtain the Windows NT 4.0 Security Rollup Package. For additional information on the SRP, click the article number below to view the article in the Microsoft Knowledge Base: Q299444 Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP) The following file is available for download from the Microsoft Download Center: Intel-based computers: DownloadDownload Q275567i.exe now (http://www.microsoft.com/downloads/release.asp?ReleaseID=25114) For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base: Q119591 How to Obtain Microsoft Support Files from Online Services Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. After it is posted, the file is housed on secure servers that prevent any unauthorized changes to the file. The English version of this fix should have the following file attributes or later: Date Time Size File name Platform ----------------------------------------------------------- 09/29/2000 09:05p 124,688 Netbt.sys Intel 09/29/2000 09:04p 224,912 Netbt.sys Alpha Microsoft Windows NT Server version 4.0, Terminal Server Edition ---------------------------------------------------------------- To resolve this problem, obtain the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package (SRP). For additional information about the SRP, click the article number below to view the article in the Microsoft Knowledge Base: Q317636 Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package STATUS ====== Microsoft has confirmed that this problem could result in some degree of security vulnerability in Microsoft Windows NT 4.0 and Windows NT Server version 4.0, Terminal Server Edition. MORE INFORMATION ================ Disabling a computer's Server service (Windows NT) or File and Print Sharing (Windows 95 or Windows 98) can prevent the computer from being susceptible to this vulnerability. For related information about this problem, please visit the following Microsoft Web site: http://www.microsoft.com/security/bulletins/ms00-091.asp For additional security-related information about Microsoft products, please visit the following Microsoft Web site: http://www.microsoft.com/security/ Additional query words: security_patch kbtsesrp ====================================================================== Keywords : kbnetwork kbSecurity MSGRAPH kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECBulletin Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServ400sp4 kbNTTermServ400sp5 kbNTTermServ400sp6 kbNTTermServSearch kbAudDeveloper kbWin95search kbWin98search kbWin98SEsearch kbBackOfficeSearch kbSBServSearch kbZNotKeyword3 kbWin98 kbWin98SE kbBackOfficeServ400 kbBackOfficeServ450 kbSBServ400 kbSBServ400a kbSBServ450 Version : :4.0,4.0 SP4,4.0 SP5,4.0 SP6,4.0a,4.5 Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbfix ============================================================================= 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 2002.