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. ******************************** Microsoft Security Bulletin (MS99-057) -------------------------------------- Patch Available for "Malformed Security Identifier Request" Vulnerability Originally Posted: December 16, 1999 Summary ======= Microsoft has released a patch that eliminates a vulnerability in Microsoft(r) Windows NT(r) 4.0. The vulnerability could allow a malicious user to cause a Windows NT machine to stop responding to requests for service. The patch for this vulnerability is included in the previously-released patch for the "Syskey Keystream Reuse" vulnerability; customers who have already applied it do not need to take any further action. Frequently asked questions regarding this vulnerability can be found at http://www.microsoft.com/security/bulletins/MS99-057faq.asp. Issue ===== The Windows NT Local Security Authority (LSA) provides a number of functions for enumerating and manipulating security information. One of these functions, LsaLookupSids(), is used to determine the Security Identifier (SID) associated with a particular user or group name. A flaw in the implementation of this function causes it to incorrectly handle certain types of invalid arguments. If an affected call were made to this function, it would cause the LSA to crash, thereby preventing the machine from performing useful work. An affected machine could be put back into service by rebooting, with the loss of any work that was in progress at the time. Remote attacks via this vulnerability would not be possible if NetBios is filtered at the firewall. Affected Software Versions ========================== - Microsoft Windows NT Workstation 4.0 - Microsoft Windows NT Server 4.0 - Microsoft Windows NT Server 4.0, Enterprise Edition - Microsoft Windows NT Server 4.0, Terminal Server Edition Patch Availability ================== - This fix for this vulnerability is included in the patch for the "Syskey Keystream Reuse" vulnerability. (See http://www.microsoft.com/Security/Bulletins/ms99-056.asp for more information on this vulnerability). Customers who have already applied it do not need to take any additional action. 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. - Microsoft Security Bulletin MS99-057: Frequently Asked Questions, http://www.microsoft.com/security/bulletins/MS99-057faq.asp. - Microsoft Knowledge Base (KB) article Q248185, SID Enumeration Function in LSA may not Handle Argument Properly, http://support.microsoft.com/support/kb/articles/q248/1/85.asp. (Note: It may take 24 hours from the original posting of this bulletin for this KB article to be visible.) - Microsoft Security Bulletin MS99-056: Patch Available for "Syskey Keystream Reuse" Vulnerability, http://www.microsoft.com/Security/Bulletins/ms99-056.asp. - Microsoft Security Advisor web site, http://www.microsoft.com/security/default.asp. Obtaining Support on this Issue =============================== This is a fully supported patch. Information on contacting Microsoft Technical Support is available at http://support.microsoft.com/support/contact/default.asp. Acknowledgments =============== Microsoft acknowledges Anthony Osborne of the Security Labs of Network Associates for bringing this issue to our attention. Revisions ========= - December 16, 1999: 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. (c) 1999 Microsoft Corporation. All rights reserved. Terms of Use. ******************************************************************* You have received this e-mail bulletin as a result of your registration to the Microsoft Product Security Notification Service. You may unsubscribe from this e-mail notification service at any time by sending an e-mail to MICROSOFT_SECURITY-SIGNOFF-REQUESTat_private The subject line and message body are not used in processing the request, and can be anything you like. For more information on the Microsoft Security Notification Service please visit http://www.microsoft.com/security/services/bulletin.asp. For security-related information about Microsoft products, please visit the Microsoft Security Advisor web site at http://www.microsoft.com/security.
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