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AUSCERT External Security Bulletin Redistribution
Vulnerabilities in Microsoft Exchange and Windows SMTP
Service Could Allow Denial of Service
14 April 2010
AusCERT Security Bulletin Summary
Product: Microsoft Exchange 2000 and 2003
Windows SMTP Service
Operating System: Windows Server 2008
Windows Server 2003
Impact/Access: Read-only Data Access -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2010-0025 CVE-2010-0024
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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
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.
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
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.
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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