MS Security Bulletin MS02-012

Discussion in 'other security issues & news' started by Zhen-Xjell, Feb 28, 2002.

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  1. 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.
    - ----------------------------------------------------------------------

    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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