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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