__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Microsoft "Malformed IMAP Request" Vulnerability January 13, 2000 17:00 GMT Number K-016 ______________________________________________________________________________ PROBLEM: Microsoft has identified a vulnerability in the Microsoft(r) Commercial Internet System (MCIS) Mail server. PLATFORM: Windows NT systems running MCIS 2.0 and 2.5 DAMAGE: The vulnerability could allow a malicious user to remotely cause services on the server to fail, or cause arbitrary code to run on the server. SOLUTION: Apply available patch. ______________________________________________________________________________ VULNERABILITY Risk is medium. Malformed request containing specially crafted ASSESSMENT: data is used to exploit this vulnerability. ______________________________________________________________________________ [ Start Microsoft Advisory ] Microsoft Security Bulletin (MS00-001) -------------------------------------- Patch Available for "Malformed IMAP Request" Vulnerability Originally Posted: January 04, 2000 Summary ======= Microsoft has released a patch that eliminates a vulnerability in the Microsoft(r) Commercial Internet System (MCIS) Mail server. The vulnerability could allow a malicious user to remotely cause services on the server to fail, or cause arbitrary code to run on the server. Frequently asked questions regarding this vulnerability can be found at http://www.microsoft.com/security/bulletins/00/MS00-001faq.asp. Issue ===== The IMAP service included in MCIS Mail has an unchecked buffer. If a malformed request containing random data were passed to the service, it could cause the web publishing, IMAP, SMTP, LDAP and other services to crash. If the malformed request contained specially crafted data, it could also be used to run arbitrary code on the server via a classic buffer overrun attack. Affected Software Versions ========================== - Microsoft Commercial Internet System 2.0 and 2.5. Patch Availability ================== - Intel: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17124 - Alpha: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17122 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 MS00-001, http://www.microsoft.com/security/bulletins/00/MS00-001faq.asp. - Microsoft Knowledge Base (KB) article Q246731, MCIS: MCIS Mail Services unexpectedly stop, http://support.microsoft.com/support/kb/articles/q246/7/31.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. Acknowledgments =============== Microsoft acknowledges Tristan Goode for bringing this issue to our attention. Revisions ========= - January 04, 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. (c) 2000 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. [ End Microsoft Advisory ] ______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Microsoft Corp. for the information contained in this bulletin. ______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. 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