Microsoft Security Advisory (2506014)
Update for the Windows Operating System Loader
Microsoft is announcing the availability of an update to winload.exe to address an issue in driver signing enforcement. While this is not an issue that would require a security update, this update addresses a method by which unsigned drivers could be loaded by winload.exe. This technique is often utilized by malware to stay resident on a system after the initial infection.
The issue affects, and the update is available for, x64-based editions of Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2. For more information about this release, see Microsoft Knowledge Base Article 2506014.
For more information about this issue, see the following references:
|Microsoft Knowledge Base Article||2506014|
This advisory discusses the following software.
|Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2|
|Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2|
|Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1|
|Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1|
|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 Service Pack 1 and Windows Vista 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 Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2|
|Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1|
|Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1|
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.
- You can provide feedback by completing the Microsoft Help and Support form, Customer Service Contact Us.
- Customers in the United States and Canada can receive technical support from Security Support. For more information about available support options, see Microsoft Help and Support.
- International customers can receive support from their local Microsoft subsidiaries. For more information about how to contact Microsoft for international support issues, visit International Support.
- Microsoft TechNet Security provides additional information about security in Microsoft products.
The information provided in this advisory 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.
- V1.0 (April 12, 2011): Advisory published.