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AUSCERT External Security Bulletin Redistribution
ESB-2009.1177
Vulnerability in Workstation Service Could Allow Elevation
of Privilege(971657)
12 August 2009
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AusCERT Security Bulletin Summary
---------------------------------
Product: Workstation Service
Publisher: Microsoft
Operating System: Windows XP
Windows Server 2003
Windows Vista
Windows Server 2008
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2009-1544
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/ms09-041.mspx
Comment: According to Microsoft, this vulnerability may be exploited by
remote authenticated users to execute arbitrary code on Windows XP
and Windows Server 2003 systems. However, it may only result in a
Denial of Service in Windows Vista and Windows Server 2008 systems.
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Microsoft Security Bulletin MS09-041 - Important
Vulnerability in Workstation Service Could Allow Elevation of Privilege
(971657)
Published: August 11, 2009
Version: 1.0
General Information
Executive Summary
This security update resolves a privately reported vulnerability in
the Windows Workstation Service. The vulnerability could allow
elevation of privilege if an attacker created a specially crafted RPC
message and sent the message to an affected system. An attacker who
successfully exploited this vulnerability could execute arbitrary code
and take complete control of an affected system. An attacker could
then install programs; view, change, or delete data; or create new
accounts with full user rights. An attacker must have valid logon
credentials to a vulnerable system in order to exploit this
vulnerability. The vulnerability could not be exploited by anonymous
users.
This security update is rated Important for all supported editions of
Windows XP and Windows Server 2003, and Moderate for all supported
editions of Windows Vista and Windows Server 2008. For more
information, see the subsection, Affected and Non-Affected Software,
in this section.
The security update addresses the vulnerability by correcting the
manner in which the Workstation service allocates and frees memory.
For more information about the vulnerability, see the Frequently Asked
Questions (FAQ) subsection for the specific vulnerability entry under
the next section, Vulnerability Information.
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.
Affected Software
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 for x64-based Systems and Windows Server 2008
for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems and Windows Server
2008 for Itanium-based Systems Service Pack 2
Vulnerability Information
Workstation Service Memory Corruption Vulnerability - CVE-2009-1544
An elevation of privilege vulnerability exists in the Windows
Workstation Service due to a possible "Double Free" condition
occurring in the service. An attacker who successfully exploited this
vulnerability could run arbitrary code with elevated privileges. An
attacker could then install programs; view, change, or delete data; or
create new accounts with full user rights.
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