Published:
31 October 2000
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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.323 -- Microsoft Security Bulletin (MS00-082) Patch Available for "Malformed MIME Header" Vulnerability 1 November 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft Exchange Server 5.5 Vendor: Microsoft Impact: Denial of Service Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Microsoft Security Bulletin (MS00-082) - - -------------------------------------- Patch Available for "Malformed MIME Header" Vulnerability Originally posted: October 31, 2000 Summary ======= Microsoft has released a patch that eliminates a security vulnerability in Microsoft(r) Exchange Server 5.5. The vulnerability could enable a malicious user to cause an Exchange server to fail. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-082.asp Issue ===== As part of its normal processing of incoming mails, Exchange server checks for invalid values in the MIME header fields. However, if a particular type of invalid value is present in certain fields, the Exchange service will fail. Normal operations can be restored by restarting the Exchange service and deleting the offending mail. There is no capability via this vulnerability to add, delete or modify emails, nor is there any capability to usurp administrative privileges on the server. The vulnerability can be eliminated either by apply the patch or Exchange 5.5 Service Pack 4, which is due to be released shortly. Exchange 2000 is not affected by the vulnerability. Affected Software Versions ========================== - Microsoft Exchange Server 5.5 Note: Exchange Server 2000 is not affected by the vulnerability. Patch Availability ================== - Microsoft Exchange Server 5.5: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=25443 Note: This patch can be applied atop systems running Exchange Server 5.5 Service Pack 3. It is included in Exchange Server 5.5 Service Pack 4. 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 MS00-082, http://www.microsoft.com/technet/security/bulletin/fq00-082.asp - Microsoft Knowledge Base article Q275714 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. Acknowledgments =============== Microsoft thanks Art Savelev (http://www.savelev.com) for reporting this issue to us and working with us to protect customers. Revisions ========= - October 31, 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 October 31, 2000 (c) 2000 Microsoft Corporation. All rights reserved. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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