Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2001.274 -- Microsoft Security Bulletin MS01-037
Authentication Error in SMTP Service Could Allow Mail Relaying
6 July 2001
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: SMTP Service
Vendor: Microsoft
Operating System: Windows 2000
Impact: Increased Privileges
Access Required: Remote
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE-----
- - -
- - ----------------------------------------------------------------------
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)
- - -
- - ---------------------------------------------------------------------
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.
- -----BEGIN PGP SIGNATURE-----
Version: PGP Personal Privacy 6.5.3
iQEVAwUBO0UPRY0ZSRQxA/UrAQFAfgf/fJNuLjRMLrZWmTzs2YR8yS164sq3VPCx
ZsU92MoVGiYIMnO+BdiL0DrJmjLUyRQ1D702xZ0j9FUINjX31f3CM5hvF2AljI5P
Dfx+9hiCZJnY+tbvtMJB0dmx0tv8sapwNqHttr7LeFfsihE7J3+OmNp5I9IbtllB
fi+h7qk7yoE7F0ztaVdkY1xkAeaqkeMWSyJ+u9GRG/5kSXzARr3UGKQwrj2viczM
/YqAzUYkD4bFjcIjFtfjew2XMv+E2zl8Yx0FWX6piuMYOgAaWArJ8X3u4iNoBCdB
AfqC73Scidn7T5g62IY/+m1WrSqGBW6yYBrdJxTJ3h1MrY4Ujz2P5A==
=flPm
- -----END PGP SIGNATURE-----
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.
NOTE: This is only the original release of the security bulletin. 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).
On call after hours for emergencies.
-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key
iQCVAwUBO0WuUCh9+71yA2DNAQFRewP/TlKZMrLwBm29wmAuUsjWffo1xrYc/APG
gv/ajkqB7AYOpCl9bfNP3avlyyY1ZHztNXCDYlQKavEX0WCXvnK//GLeTrwssdHu
4mGLuRwbHuHKEQyr9hAuT2ni2YxBoldWpMlpv6Z/wPMsN+dNTvwiDydK1dLaqqMT
9jwlccbhIWg=
=Hglx
-----END PGP SIGNATURE-----