From secnotif@MICROSOFT.COM Fri Jul 2 01:04:10 1999 From: Microsoft Product Security To: MICROSOFT_SECURITY@ANNOUNCE.MICROSOFT.COM Date: Wed, 30 Jun 1999 14:52:52 -0700 Subject: Microsoft Security Bulletin (MS99-023) 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 (MS99-023) Patch Available for "Malformed Image Header" Vulnerability ---------------------------------------------------------- Originally Posted: June 30, 1999 Summary ======= Microsoft has released a patch that eliminates a vulnerability that could allow denial of service attacks against Microsoft(r) Windows NT(r) servers, workstations, and terminal servers. This patch already is available as part of Windows NT Server Service Pack 5, but is being provided as a stand-alone patch for the benefit of users who have entered Y2K lockdown on Service Pack 4. Frequently asked questions regarding this vulnerability can be found at http://www.microsoft.com/security/bulletins/MS99-023faq.asp Issue ===== If an executable file with a specially-malformed image header is executed, it will cause a system failure. The affected machine will need to be rebooted in order to place it back in service. Any work that was in progress when the machine crashed could be lost. Affected Software Versions ========================== - Microsoft Windows NT Server 4.0 - Microsoft Windows NT Workstation 4.0 - Microsoft Windows NT Server 4.0, Terminal Server Edition Patch Availability ================== - Windows NT Server and Workstation 4.0: ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes /usa/nt40/Hotfixes-PostSP4/Kernel-fix/ - Windows NT Server 4.0, Terminal Server Edition: ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes /usa/nt40tse/Hotfixes-PostSP4/Kernel-fix/ NOTE: Line breaks have been added to the above URLs for readability. More Information ================ Please see the following references for more information related to this issue. - Microsoft Security Bulletin MS99-023: Frequently Asked Questions, http://www.microsoft.com/security/bulletins/MS99-023faq.asp. - Microsoft Knowledge Base (KB) article Q234557, Executable with a Specially-Malformed Image Header May Crash Windows NT, http://support.microsoft.com/support/kb/articles/q234/5/57.asp. (Note: It may take 24 hours from the original posting of this bulletin for the KB article to be visible) - 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. Revisions ========= - June 30, 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-REQUEST@ANNOUNCE.MICROSOFT.COM 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.