MS Security Bulletin MS02-012

[Zhen-Xjell]

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Title: * * *Malformed Data Transfer Request can Cause Windows SMTP
* * * * * *Service to Fail
Date: * * * 27 February 2002
Software: * Microsoft Windows 2000; Microsoft Windows XP Professional
* * * * * *Microsoft Exchange 2000
Impact: * * Denial of Service
Max Risk: * Low
Bulletin: * MS02-012

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS02-012.asp.
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Issue:
======
An SMTP service installs by default as part of Windows 2000 server
products. Exchange 2000, which can only be installed on Windows 2000,
uses the native Windows 2000 SMTP service rather than providing its
own. In addition, Windows 2000 and Windows XP workstation products
provide an SMTP service that is not installed by default. All of
these implementations contain a flaw that could enable denial of
service attacks to be mounted against the service.

The flaw involves how the service handles a particular type of SMTP
command used to transfer the data that constitutes an incoming
mail. By sending a malformed version of this command, an attacker
could cause the SMTP service to fail. This would have the effect
of disrupting mail services on the affected system, but would not
cause the operating system itself to fail.

Mitigating Factors:
====================
- Windows XP Home Edition does not provide an SMTP service, and
* is not affected by the vulnerability.

- Windows 2000 Professional and Windows XP Professional do provide
* an SMTP service, but it is not installed by default.

- Windows 2000 server products do install the SMTP service by
* default. However, best practices recommend disabling any
* unneeded services, and systems on which the SMTP service had been
* disabled would not be at risk.

- Exchange 5.5, even if installed on a Windows 2000 server, is not
* affected by the vulnerability.

- The result of an attack would be limited to disrupting the SMTP
* service and, depending on the system configuration, potentially
* IIS and other internet services as well. However, it would not
* disrupt any other system functions.

- The vulnerability would not enable an attacker to gain any
* privileges on the affected system or to access users' email or
* data.

Risk Rating:
============
- Internet systems: Low
- Intranet systems: Low
- Client systems: Low

Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
* Security Bulletin at
* http://www.microsoft.com/technet/security/bulletin/ms02-012.asp
* for information on obtaining this patch.

Acknowledgment:
===============
- *H D Moore (hdm@secureaustin.com)

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