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TUCoPS :: Windows Net Apps :: ciacl107.txt

Microsoft Authentication Error in SMTP Service




             __________________________________________________________

                       The U.S. Department of Energy
                     Computer Incident Advisory Center
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

                 Microsoft Authentication Error in SMTP Service
                     [Microsoft Security Bulletin MS01-037]

July 6, 2001 21:00 GMT                                            Number L-107
______________________________________________________________________________
PROBLEM:       An SMTP service installs by default as part of Windows 2000 
               server products, and can be selected for installation on 
               Windows 2000 Professional. A vulnerability results because of a 
               flaw in the authentication process used by the service. 
PLATFORM:      Microsoft Windows 2000 
DAMAGE:        The vulnerability could allow an unauthorized user to 
               successfully authenticate to the service using incorrect 
               credentials. The unauthorized user could gain user-level 
               privileges on the SMTP service. 
SOLUTION:      Apply the patch provided by Microsoft. 
______________________________________________________________________________
VULNERABILITY  The risk is LOW. The most likely purpose in exploiting the 
ASSESSMENT:    vulnerability would be to perform mail relaying via the server. 
______________________________________________________________________________

[******  Start Microsoft Security Bulletin ******]

------------------------------------------------------------------------------
Title:      Authentication Error in SMTP Service Could Allow Mail
            Relaying
Date:       05 July, 2001
Software:   Windows 2000
Impact:     Mail Relaying
Bulletin:   MS01-037

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-037.asp.

------------------------------------------------------------------------------

Issue:
======
An SMTP service installs by default as part of Windows 2000 server
products, and can be selected for installation on Windows 2000
Professional. A vulnerability results because of a flaw in the
authentication process used by the service. The vulnerability could
allow an unauthorized user to successfully authenticate to the
service using incorrect credentials. An attacker who exploited
the vulnerability could gain user-level privileges on the SMTP
service, thereby enabling the attacker to use the service but
not to administer it. The most likely purpose in exploiting the
vulnerability would be to perform mail relaying via the server.

Mitigating Factors:
====================
  - Exchange servers -- even when run on Windows 2000 --
    are not affected by this vulnerability.
  - Best practices recommend disabling unneeded services.
    If the SMTP service has been disabled, the
    vulnerability could not be exploited.
  - The vulnerability only affects stand-alone machines,
    not domain members.
  - Proper firewalling could prevent Internet-based attacks
    by blocking port 25 on servers that do not specifically
    need to accept SMTP traffic.

Patch Availability:
===================
  - A patch is available to fix this vulnerability. Please read
    the Security Bulletin
    http://www.microsoft.com/technet/security/bulletin/ms01-037.asp
    for information on obtaining this patch.

Acknowledgment:
===============
  - Joao Gouveia (tharbad@kaotik.org)

--------------------------------------------------------------------------------

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[******  End Microsoft Security Bulletin ******]


_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Microsoft for the 
information contained in this bulletin.
_______________________________________________________________________________


CIAC, the Computer Incident Advisory Center, 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. CIAC
can be contacted at:
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    FAX:      +1 925-423-8002
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    E-mail:   ciac@ciac.org

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available from the CIAC Computer Security Archive.

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PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins.  If you are not part of these
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organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.

This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
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