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AUSCERT External Security Bulletin Redistribution
ESB-2010.0342
Vulnerabilities in Windows Kernel Could Allow Elevation of Privilege
14 April 2010
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AusCERT Security Bulletin Summary
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Product: Windows Kernel
Publisher: Microsoft
Operating System: Windows Server 2008
Windows Server 2003
Windows 7
Windows Vista
Windows XP
Windows 2000
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2010-0810 CVE-2010-0482 CVE-2010-0481
CVE-2010-0238 CVE-2010-0237 CVE-2010-0236
CVE-2010-0235 CVE-2010-0234
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/ms10-021.mspx
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Microsoft Security Bulletin (979683)
Vulnerabilities in Windows Kernel Could Allow Elevation of Privilege
Published: April 13, 2010
Version: 1.0
General Information
Executive Summary
This security update resolves several privately reported vulnerabilities in
Microsoft Windows. The most severe of these vulnerabilities could allow
elevation of privilege if an attacker logged on locally and ran a specially
crafted application. An attacker must have valid logon credentials and be
able to log on locally to exploit these vulnerabilities. The vulnerabilities
could not be exploited remotely or by anonymous users.
This security update is rated Important for all supported editions of
Microsoft Windows 2000, Windows XP, Windows Server 2003, and the original
release version of Windows Vista. This security update is rated Moderate for
all supported versions of Windows Vista Service Pack 1 and Windows Vista
Service Pack 2, Windows Server 2008, Windows 7, and Windows Server 2008 R2.
The security update addresses the vulnerabilities by correcting validations,
the creation of symbolic links, the resolution of virtual registry key paths,
and exceptions handling.
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
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 Vista
Windows Vista Service Pack 1
Windows Vista Service Pack 2
Windows Vista x64 Edition
Windows Vista x64 Edition Service Pack 1
Windows Vista x64 Edition Service Pack 2
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 for Itanium-based Systems
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 for Itanium-based Systems
Mitigating Factors
An attacker must have valid logon credentials and be able to log on
locally to exploit these vulnerabilities. The vulnerabilities could not be
exploited remotely or by anonymous users.
Vulnerability Information
Windows Kernel Null Pointer Vulnerability - CVE-2010-0234
A denial of service vulnerability exists in the Windows kernel due to
the insufficient validation of registry keys passed to a Windows kernel
system call. An attacker could exploit the vulnerability by running a
specially crafted application, causing the system to become unresponsive and
automatically restart.
Windows Kernel Symbolic Link Value Vulnerability - CVE-2010-0235
A denial of service vulnerability exists in the Windows kernel due to the
manner in which the kernel processes the values of symbolic links. An
attacker could exploit the vulnerability by running a specially crafted
application causing the system to become unresponsive and automatically
restart.
Windows Kernel Memory Allocation Vulnerability - CVE-2010-0236
An elevation of privilege vulnerability exists in the Windows kernel due
to the manner in which memory is allocated when extracting a symbolic link
from a registry key. 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.
Windows Kernel Symbolic Link Creation Vulnerability - CVE-2010-0237
An elevation of privilege vulnerability exists when the Windows kernel does
not properly restrict symbolic link creation between untrusted and trusted
registry hives. 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.
Mitigating Factors
This vulnerability allows an unprivileged user on a computer to run arbitrary
code in the context of a user who later logs in to the same computer. The
attacker cannot choose which user to impersonate.
Windows Kernel Registry Key Vulnerability - CVE-2010-0238
A denial of service vulnerability exists in the way that the Windows kernel
validates registry keys. An attacker could exploit the vulnerability by
running a specially crafted application causing the system to become
unresponsive and automatically restart.
Windows Virtual Path Parsing Vulnerability - CVE-2010-0481
A denial of service vulnerability exists in the Windows kernel due to the way
that the kernel resolves the real path for a registry key from its virtual
path. An attacker could exploit the vulnerability by running a specially
crafted application, causing the system to become unresponsive and
automatically restart.
Windows Kernel Malformed Image Vulnerability - CVE-2010-0482
A denial of service vulnerability exists in the Windows kernel due to the
improper validation of specially crafted image files. An attacker could
exploit the vulnerability by running a specially crafted application causing
the system to become unresponsive and automatically restart.
Windows Kernel Exception Handler Vulnerability - CVE-2010-0810
A denial of service vulnerability exists in the Windows kernel due to the way
that the kernel handles certain exceptions. An attacker could exploit the
vulnerability by running a specially crafted application, causing the system
to become unresponsive and automatically restart.
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