Launch Printer Friendly Page Security TechCenter > Security Bulletins > Microsoft Security Bulletin MS10-021

Microsoft Security Bulletin MS10-021 - Important

Vulnerabilities in Windows Kernel Could Allow Elevation of Privilege (979683)

Published: | Updated:

Version: 1.1

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. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerabilities by correcting validations, the creation of symbolic links, the resolution of virtual registry key paths, and exceptions handling. For more information about the vulnerabilities, 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.

See also the section, Detection and Deployment Tools and Guidance, later in this bulletin.

Known Issues. Microsoft Knowledge Base Article 979683 documents the currently known issues that customers may experience when installing this security update. The article also documents recommended solutions for these issues.

Affected and Non-Affected Software

The following software have been tested to determine which versions or editions are affected. Other versions or editions are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, visit Microsoft Support Lifecycle.

Affected Software

Operating SystemMaximum Security ImpactAggregate Severity RatingBulletins Replaced by this Update
Microsoft Windows 2000 Service Pack 4Elevation of PrivilegeImportantMS10-015
Windows XP Service Pack 2 and Windows XP Service Pack 3Elevation of PrivilegeImportantMS10-015
Windows XP Professional x64 Edition Service Pack 2Elevation of PrivilegeImportantMS10-015
Windows Server 2003 Service Pack 2Elevation of PrivilegeImportantMS10-015
Windows Server 2003 x64 Edition Service Pack 2Elevation of PrivilegeImportantMS10-015
Windows Server 2003 with SP2 for Itanium-based SystemsElevation of PrivilegeImportantMS10-015
Windows VistaElevation of PrivilegeImportantMS10-015
Windows Vista Service Pack 1 and Windows Vista Service Pack 2Denial of ServiceModerateMS10-015
Windows Vista x64 EditionElevation of PrivilegeImportantMS10-015
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2Denial of ServiceModerateMS10-015
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2*Denial of ServiceModerateMS10-015
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2*Denial of ServiceModerateMS10-015
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2Denial of ServiceModerateMS10-015
Windows 7 for 32-bit SystemsDenial of ServiceModerateNone
Windows 7 for x64-based SystemsDenial of ServiceModerateNone
Windows Server 2008 R2 for x64-based Systems*Denial of ServiceModerateNone
Windows Server 2008 R2 for Itanium-based SystemsDenial of ServiceModerateNone

*Server Core installation affected. This update applies, with the same severity rating, to supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, whether or not installed using the Server Core installation option. For more information on this installation option, see the MSDN articles, Server Core and Server Core for Windows Server 2008 R2. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.

Frequently Asked Questions (FAQ) Related to This Security Update

Vulnerability Information

Severity Ratings and Vulnerability Identifiers

Windows Kernel Null Pointer Vulnerability - CVE-2010-0234

Windows Kernel Symbolic Link Value Vulnerability - CVE-2010-0235

Windows Kernel Memory Allocation Vulnerability - CVE-2010-0236

Windows Kernel Symbolic Link Creation Vulnerability - CVE-2010-0237

Windows Kernel Registry Key Vulnerability - CVE-2010-0238

Windows Virtual Path Parsing Vulnerability - CVE-2010-0481

Windows Kernel Malformed Image Vulnerability - CVE-2010-0482

Windows Kernel Exception Handler Vulnerability - CVE-2010-0810

Update Information

Detection and Deployment Tools and Guidance

Security Update Deployment

Other Information

Acknowledgments

Microsoft thanks the following for working with us to help protect customers:

Microsoft Active Protections Program (MAPP)

To improve security protections for customers, Microsoft provides vulnerability information to major security software providers in advance of each monthly security update release. Security software providers can then use this vulnerability information to provide updated protections to customers via their security software or devices, such as antivirus, network-based intrusion detection systems, or host-based intrusion prevention systems. To determine whether active protections are available from security software providers, please visit the active protections Web sites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.

Support

  • Customers in the U.S. and Canada can receive technical support from Security Support or 1-866-PCSAFETY. There is no charge for support calls that are associated with security updates. For more information about available support options, see Microsoft Help and Support.
  • International customers can receive support from their local Microsoft subsidiaries. There is no charge for support that is associated with security updates. For more information about how to contact Microsoft for support issues, visit the International Support Web site.

Disclaimer

The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Revisions

  • V1.0 (April 13, 2010): Bulletin published.
  • V1.1 (July 13, 2010): Added an entry in the Update FAQ to announce a detection change to the update for Windows 7 for 32-bit Systems. This is a detection change only. There were no changes to the security update files in this bulletin. Customers who have already installed the update successfully do not need to reinstall.