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             AUSCERT External Security Bulletin Redistribution

                               ESB-2010.0345
          Vulnerabilities in Microsoft Exchange and Windows SMTP
                   Service Could Allow Denial of Service
                               14 April 2010

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Microsoft Exchange 2000 and 2003
                   Windows SMTP Service
Publisher:         Microsoft
Operating System:  Windows Server 2008
                   Windows Server 2003
                   Windows XP
                   Windows 2000
Impact/Access:     Read-only Data Access -- Remote/Unauthenticated
                   Denial of Service     -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2010-0025 CVE-2010-0024 

Original Bulletin: 
   http://www.microsoft.com/technet/security/bulletin/ms10-024.mspx

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Microsoft Security Bulletin (981832)

Vulnerabilities in Microsoft Exchange and Windows SMTP Service Could Allow
Denial of Service

Published: April 13, 2010

Version: 1.0

General Information

Executive Summary

  This security update resolves one publicly disclosed vulnerability and one
  privately reported vulnerability in Microsoft Exchange and Windows SMTP
  Service. The more severe of these vulnerabilities could allow denial of
  service if an attacker sent a specially crafted DNS response to a computer
  running the SMTP service. By default, the SMTP component is not installed on
  Windows Server 2003, Windows Server 2003 x64 Edition, or Windows XP
  Professional x64 Edition.

  This security update is rated Important for all supported editions of
  Microsoft Windows 2000, Windows XP, and Windows Server 2003; 32-bit and
  x64-based editions of Windows Server 2008; Windows Server 2008 R2 for
  x64-based Systems; and Microsoft Exchange Server 2003. This security update
  is rated Moderate for Microsoft Exchange Server 2000.

  The security update addresses the vulnerabilities by correcting the manner in
  which SMTP parses MX records and the manner in which SMTP allocates memory for
  interpreting SMTP command responses.

  Recommendation: The majority of customers have automatic updating enabled and
  will not need to take any action because this security update will be
  downloaded and installed automatically. Customers who have not enabled
  automatic updating need to check for updates and install this update manually.
  For information about specific configuration options in automatic updating,
  see Microsoft Knowledge Base Article 294871.

  For administrators and enterprise installations, or end users who want to
  install this security update manually, Microsoft recommends that customers
  apply the update at the earliest opportunity using update management software,
  or by checking for updates using the Microsoft Update service.

  Known Issues: Microsoft Knowledge Base Article 981832 documents the currently
  known issues that customers may experience when installing this security
  update. The article also documents recommended solutions for these issues.

Affected Software

  Microsoft Windows 2000 Service Pack 4
  Windows XP Service Pack 2
  Windows XP Service Pack 3
  Windows XP Professional x64 Edition Service Pack 2
  Windows Server 2003 Service Pack 2
  Windows Server 2003 x64 Edition Service Pack 2
  Windows Server 2003 with SP2 for Itanium-based Systems
  Windows Server 2008 for 32-bit Systems
  Windows Server 2008 for 32-bit Systems Service Pack 2
  Windows Server 2008 for x64-based Systems
  Windows Server 2008 for x64-based Systems Service Pack 2
  Windows Server 2008 R2 for x64-based Systems
  Microsoft Exchange Server 2000 Service Pack 3
  Microsoft Exchange Server 2003 Service Pack 2

Vulnerability Information

SMTP Server MX Record Vulnerability - CVE-2010-0024

  A denial of service vulnerability exists in the way that the Microsoft Windows
  Simple Mail Transfer Protocol (SMTP) component handles specially crafted DNS
  Mail Exchanger (MX) resource records. An attempt to exploit the vulnerability
  would not require authentication, allowing an attacker to exploit the
  vulnerability by sending a specially crafted network message to a computer
  running the SMTP service. An attacker who successfully exploited this
  vulnerability could cause the SMTP service to stop responding until restarted.

  Mitigating Factors

  By default, the SMTP component is not installed on Windows Server 2003,
  Windows Server 2003 x64 Edition, or Windows XP Professional x64 Edition.

SMTP Memory Allocation Vulnerability - CVE-2010-0025

  An information disclosure vulnerability exists in the Microsoft Windows
  Simple Mail Transfer Protocol (SMTP) component due to the manner in which
  the SMTP component handles memory allocation. An attacker could exploit the
  vulnerability by sending invalid commands, followed by the STARTTLS command,
  to an affected server. An attacker who successfully exploited this
  vulnerability could read random e-mail message fragments stored on the
  affected server. Note that this vulnerability would not allow an attacker to
  execute code or to elevate their user rights directly, but it could be used
  to produce useful information that could be used to try to further compromise
  the affected system.

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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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