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AUSCERT External Security Bulletin Redistribution
Vulnerability in Local Security Authority Subsystem Service
Could Allow Denial of Service
14 October 2009
AusCERT Security Bulletin Summary
Product: Microsoft Windows
Operating System: Windows XP
Windows Server 2003
Windows Server 2008
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2009-2524
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Microsoft Security Bulletin MS09-059 - Important
Vulnerability in Local Security Authority Subsystem Service Could Allow Denial
of Service (975467)
Published: October 13, 2009
This security update resolves a privately reported vulnerability in Microsoft
Windows. The vulnerability could allow denial of service if an attacker sent
a maliciously crafted packet during the NTLM authentication process.
This security update is rated Important for all supported editions of Windows
XP, Windows Server 2003, Windows Vista, Windows Server 2008, and Windows 7.
Supported editions of Windows XP and Windows Server 2003 are only affected if
they have previously installed the non-security update described in KB968389.
The security update addresses the vulnerability by implementing additional
validation of specific value sets used in the authentication process. For
more information about the vulnerability, see the Frequently Asked Questions
(FAQ) subsection for the specific vulnerability entry under the next section,
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 975467 documents the currently
known issues that customers may experience when installing this security
update. The article also documents recommended solutions for these issues.
Windows XP Service Pack 2 and 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 Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2
Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit
Systems Service Pack 2 (Windows Server 2008 Server Core installation affected)
Windows Server 2008 for x64-based Systems and Windows Server 2008 for
x64-based Systems Service Pack 2 (Windows Server 2008 Server Core
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for
Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems (Windows Server 2008 R2 Server
Core installation affected)
Windows Server 2008 R2 for Itanium-based Systems
Local Security Authority Subsystem Service Integer Overflow Vulnerability -
A denial of service vulnerability exists in the Microsoft Windows Local
Security Authority Subsystem Service (LSASS) due to its improper handling of
malformed packets during NTLM authentication. An attacker could create
specially crafted anonymous NTLM authentication requests that would cause a
crash in the LSASS service and subsequently would restart the computer.
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