DOCUMENT:Q279336 08-MAY-2002 [winnt] TITLE :MS01-003: Patch Available for Winsock Mutex Vulnerability PRODUCT :Microsoft Windows NT PROD/VER::4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a OPER/SYS: KEYWORDS:kbSecurity kbWinNT400PreSP7Fix kbTSE400preSP7fix kbgraphxlinkcritical KbSECVulnerabilit ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4, 4.0 SP5, 4.0 SP6a - Microsoft Windows NT Server versions 4.0, 4.0 SP4, 4.0 SP5, 4.0 SP6, Terminal Server Edition ------------------------------------------------------------------------------- SYMPTOMS ======== Microsoft has released a patch that eliminates a security vulnerability in Windows NT 4.0. This vulnerability could allow a malicious user to run a special program to disable an affected computer's network functionality. Like all other objects under Windows NT 4.0, mutexes (synchronization objects that govern access to resources) have permissions associated with them that govern how they can be accessed. However, a particular mutex that is used to govern access to a networking resource has inappropriately loose permissions. This could enable an attacker who has the ability to run code on a local computer to monopolize the mutex, thereby preventing any other processes from using the resource that it controls. This would have the effect of preventing the computer from participating on the network. The attacker would require interactive logon access to the affected computer. This significantly limits the scope of the vulnerability because, if normal security recommendations have been followed, unprivileged users are not granted interactive logon rights to critical computers such as servers. Unprivileged users typically are granted interactive logon rights to workstations and Terminal Servers. However, a workstation would not be a tempting target for an attacker, because the attacker could use this vulnerability to deny service only to himself or herself. The computers most likely to be affected would be Terminal Servers. RESOLUTION ========== Windows NT 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 file is available for download from the Microsoft Download Center: DownloadDownload Q2769336i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27272) 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 Version Size File name Platform ---------------------------------------------------------------- 11/15/2000 11:14p 4.0.1381.7086 78,096 Mswsock.dll Intel 11/15/2000 11:14p 4.0.1381.7086 70,928 Ws2_32.dll Intel NOTE: Due to file dependencies, this hotfix requires Microsoft Windows NT 4.0 Service Pack 4, Service Pack 5, or Service Pack 6a. Windows NT Server 4.0, Terminal Server Edition ---------------------------------------------- To resolve this problem, either obtain the hotfix referenced in this section or 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 A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems that are determined to be at risk of attack. Please evaluate your computer's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to your computer. Please see the associated Microsoft Security Bulletin (http://www.microsoft.com/technet/security/bulletin/ms01-003.asp) to help make this determination. This fix may receive additional testing at a later time, to further ensure product quality. If your computer is sufficiently at risk, Microsoft recommends that you apply this fix now. To resolve this problem immediately, download the fix as instructed below or contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS NOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The following file is available for download from the Microsoft Download Center: DownloadDownload Q2769336i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27291) 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 Version Size File name Platform ----------------------------------------------------------------- 12/19/2000 11:29a 4.0.1381.33472 78,096 Mswsock.dll Intel 12/19/2000 11:23a 4.0.1381.33472 70,416 Ws2_32.dll Intel NOTE: Due to file dependencies, this hotfix requires Microsoft Windows NT 4.0 Service Pack 4, Service Pack 5, or Service Pack 6a. STATUS ====== WINDOWS NT 4.0 Microsoft has confirmed that this problem could result in some degree of security vulnerability in Windows NT 4.0. 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. MORE INFORMATION ================ For more information, please see the following Microsoft Web site: http://www.microsoft.com/technet/security/bulletin/ms01-003.asp Additional query words: security_patch kbtsesrp ====================================================================== Keywords : kbSecurity kbWinNT400PreSP7Fix kbTSE400preSP7fix kbgraphxlinkcritical KbSECVulnerability KbSECBulletin KbSECHack Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400sp6 kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400sp3 kbWinNTS400sp2 kbWinNTS400sp1 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServ400sp4 kbNTTermServ400sp5 kbNTTermServ400sp6 kbNTTermServSearch Version : :4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a 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.