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.



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