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Microsoft Security Bulletin (MS00-069)
From: Microsoft Product Security <secnotif () MICROSOFT COM>
Date: Fri, 29 Sep 2000 23:32:37 -0700
The following is a Security Bulletin from the Microsoft Product Security Notification Service. Please do not reply to this message, as it was sent from an unattended mailbox. ******************************** -----BEGIN PGP SIGNED MESSAGE----- Microsoft Security Bulletin (MS00-069) - -------------------------------------- Patch Available for "Simplified Chinese IME State Recognition" Vulnerability Originally posted: September 29, 2000 Summary ======= Microsoft has released a patch that eliminates a security vulnerability in Microsoft(r) Windows(r) 2000. The vulnerability could allow a malicious user to gain complete control over an affected machine. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-069.asp Issue ===== Input Method Editors (IMEs) enable character-based languages such as Chinese to be entered via a standard 101-key keyboard. When an IME is installed as part of the system setup, it is available by default as part of the logon screen. In such a case, the IME should recognize that it is running in the context of the LocalSystem and not in the context of a user, and restrict certain functions. However, the IME for Simplified Chinese does not correctly recognize the machine state, and exposes inappropriate functions as part of the logon screen. As a result, a malicious user who had access to either a physical keyboard or a terminal server session on an affected machine could gain LocalSystem privilege even without logging onto the machine. This vulnerability only affects the Simplified Chinese version of Windows 2000 by default - customers using any other version of Windows 2000 are not affected. Even if the Simplified Chinese IMEs were installed after setup as part of a language pack, it would not be present as part of the logon screen and therefore would not pose a security threat. The vulnerability allows only the local machine to be compromised, but does not grant any domain privileges (unless, of course, the local machine happens to be a domain controller). Because the vulnerability is exposed as part of the logon screen, it could only be exploited by a user who had physical access to a keyboard, or who could start a terminal server session on an affected machine. If best practices - which strongly recommend against giving normal users physical access to critical servers, or allowing terminal server session on such servers - have been followed, this vulnerability would affect only workstations and terminal servers. Affected Software Versions ========================== - Microsoft Windows 2000 Note: Only the Simplified Chinese version of Windows 2000 is affected by default. Customers running any other language version of Windows 2000 only need to take action if they installed a Simplified Chinese IME during system setup. Patch Availability ================== - Microsoft Windows 2000, Simplified Chinese version: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=24631 - Microsoft Windows 2000, English version: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=24627 Note: This patch can be installed on systems running Windows 2000, either with or without Service Pack 1. The patch will be incorporated into Service Pack 2. Note: Additional security patches are available at the Microsoft Download Center More Information ================ Please see the following references for more information related to this issue. - Frequently Asked Questions: Microsoft Security Bulletin MS00-069, http://www.microsoft.com/technet/security/bulletin/fq00-069.asp - Microsoft Knowledge Base article Q270676 discusses this issue and will be available soon. - Microsoft TechNet Security web site, http://www.microsoft.com/technet/security/default.asp Obtaining Support on this Issue =============================== This is a fully supported patch. Information on contacting Microsoft Product Support Services is available at http://support.microsoft.com/support/contact/default.asp. Revisions ========= - September 29, 2000: Bulletin Created. 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. Last Updated September 29, 2000 (c) 2000 Microsoft Corporation. All rights reserved. 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