Security Advisory					CERT-NL
Author/Source	:	Teun Nijssen	Index	:		S-00-03
Distribution	:	World	Page	:		1
Classification	:	External	Version	:		1
Subject	:	Buffer overflow Miscrosoft MCIS mail server	Date	:		05-Jan-2000

By courtesy of Microsoft Product Security we received information on a vulnerability in the Microsoft Commercial Internet System (MCIS) Mail server.

CERT-NL recommends to apply the patches mentioned below.

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.

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