DOCUMENT:Q248185 08-MAY-2002 [winnt] TITLE :SID Enumeration Function in LSA May Not Handle Argument Properly PRODUCT :Microsoft Windows NT PROD/VER:winnt:1.0,1.1,4.0,4.0 SP4,4.0 SP5,4.0 SP6 OPER/SYS: KEYWORDS:kbnetwork kbWinNT4sp6fix kbgraphxlinkcritical ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 SP6, Terminal Server Edition - Microsoft Windows NT Server versions 4.0 SP4, 4.0 SP5, 4.0 SP6 - Microsoft Windows NT Server, Enterprise Edition version 4.0 - Microsoft BackOffice Server 4.0 - Microsoft BackOffice Small Business Server version 4.0 - Microsoft Windows NT Server, Enterprise Edition version 4.0 - Microsoft Cluster Server, version 1.1 ------------------------------------------------------------------------------- SYMPTOMS ======== When the LsaLookupSids() function in Windows NT Local Security Authority (LSA) is used to determine the Security Identifier (SID) associated with a particular user or group name, invalid or contradictory arguments passed to the function may not be handled correctly. The result may cause LSA to cease functioning properly and prevent the computer from working. You can restart an affected computer to put it back into service, but any work that was in progress at the time is lost. NOTE: This vulnerability does not affect computers running Microsoft Windows 2000. RESOLUTION ========== Windows NT Server or Workstation 4.0 ------------------------------------ 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 files are available for download from the Microsoft Download Center: DownloadDownload Q248183.exe for x86-based computers now (http://www.microsoft.com/downloads/release.asp?ReleaseID=16798) DownloadDownload Q248183.exe for Alpha-based computers now (http://www.microsoft.com/downloads/release.asp?ReleaseID=16799) The English version of this fix should have the following file attributes or later: Date Time Size File name Platform --------------------------------------------------- 11/22/99 03:05p 284,808 Lsasrv.dbg x86 11/22/99 03:05p 155,408 Lsasrv.dll x86 11/22/99 03:05p 82,260 Lsasrv.dbg Alpha 11/22/99 03:05p 253,712 Lsasrv.dll Alpha Windows NT Server 4.0, Terminal Server Edition ---------------------------------------------- To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, please see the following article in the Microsoft Knowledge Base: Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack STATUS ====== Windows NT Server or Workstation 4.0 ------------------------------------ Microsoft has confirmed this to be a problem in the Microsoft products that are listed at the beginning of this article. Windows NT Server 4.0, Terminal Server Edition ---------------------------------------------- Microsoft has confirmed that this problem could result in some degree of security vulnerability in Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT Server 4.0, Terminal Server Edition Service Pack 6. MORE INFORMATION ================ LSA provides security services for Windows NT. Among other tasks, it authenticates all logon requests, adjudicates users' privileges, determines whether users can gain access to requested resources, and oversees the security auditing functions. The loss of the LSA service through this vulnerability essentially renders the computer unable to perform any useful work because all requests for services are denied by default. When a user makes a service request that calls LsaLookupSids(), Windows NT performs a security check to verify that the user has sufficient privileges before fulfilling the request. There is no capability through this vulnerability to bypass the security check. However, the computer stops responding before the check is made, so any user, regardless of privilege, could levy the request and cause the LSA to stop responding. Although it is possible to call LSA functions remotely, doing so requires NetBIOS. If you follow standard recommended security practices, NetBIOS should be filtered through a firewall, preventing an external request from reaching your computer. For related information about this problem, please visit the following Microsoft Web site: http://www.microsoft.com/security/bulletins/ms99-057faq.asp For additional security-related information about Microsoft products, please visit the following Microsoft Web site: http://www.microsoft.com/security/ Additional query words: ====================================================================== Keywords : kbnetwork kbWinNT4sp6fix kbgraphxlinkcritical Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400sp6 kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400search kbNTTermServ400sp6 kbNTTermServSearch kbAudDeveloper kbClustServSearch kbBackOfficeSearch kbSBServSearch kbBackOfficeServ400 kbSBServ400 kbClustServ110 Version : winnt:1.0,1.1,4.0,4.0 SP4,4.0 SP5,4.0 SP6 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.