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AUSCERT External Security Bulletin Redistribution
Vulnerability in Windows Client/Server Run-time Subsystem
Could Allow Elevation of Privilege
10 February 2010
AusCERT Security Bulletin Summary
Product: Microsoft Windows Client/Server Run-time Subsystem
Operating System: Windows Server 2003
Impact/Access: Administrator Compromise -- Existing Account
CVE Names: CVE-2010-0023
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Microsoft Security Bulletin MS10-011 - Important
Vulnerability in Windows Client/Server Run-time Subsystem Could Allow
Elevation of Privilege (978037)
Published: February 09, 2010
This security update resolves a privately reported vulnerability in
Microsoft Windows Client/Server Run-time Subsystem (CSRSS) in
Microsoft Windows 2000, Windows XP, and Windows Server 2003. Other
versions of Windows are not affected. The vulnerability could allow
elevation of privilege if an attacker logs on to the system and
starts a specially crafted application designed to continue running
after the attacker logs out. An attacker must have valid logon
credentials and be able to log on locally to exploit this
vulnerability. The vulnerability could not be exploited by anonymous
This security update is rated Important for all supported editions
of Microsoft Windows 2000, Windows XP, and Windows Server 2003.
The security update addresses the vulnerability by correcting the
manner in which users' processes are terminated upon logout.
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 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
Known Issues. None
Microsoft Windows 2000 Service Pack 4
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
CSRSS Local Privilege Elevation Vulnerability - CVE-2010-0023
An elevation of privilege vulnerability exists because the Windows
Client/Server Run-time Subsystem (CSRSS) does not properly terminate
user processes when a user logs out. An attacker who successfully
exploited this vulnerability could run arbitrary code in kernel mode.
An attacker could then install programs; view, change, or delete data;
or create new accounts with full user rights.
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