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A hotfix is available to block standard users from logging on to a Window 7-based or Windows Server 2008 R2-based computer in safe mode

INTRODUCTION
By default, a standard user can log on to a Windows 7-based or Windows Server 2008 R2-based computer by using safe mode startup options, such as the safe mode with networking option. However, some system protections are bypassed when the system is running in safe mode.

This article describes a hotfix that is available for Windows 7 and for Windows Server 2008 R2. The hotfix lets administrators block standard users from logging on in safe mode, safe mode with networking, or safe mode with command prompt.
MORE INFORMATION

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next P1 that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

No prerequisites are required.

Registry information

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

To apply this hotfix, you must create a registry entry after you install the hotfix package. To do this, follow these steps:
  1. Click Start, click Run, type regedit, and then press ENTER.
  2. Locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
  3. On the Edit menu, point to New, and then click DWORD (32-bit) Value.
  4. Type SafeModeBlockNonAdmins , and then press ENTER.
  5. Right-click SafeModeBlockNonAdmins, and then click Modify.
  6. In the Value data box, type 1, and then click OK .

    Note If you set this value to 0, the system does not block non-administrator users.
  7. Exit Registry Editor.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes

Important Windows 7 and Windows Server 2008 R2 updates are included in the same packages.
  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    VersionProductMilestoneService branch
    6.1.760 0.20xxxWindows 7 and Windows Server 2008 R2RTMLDR
For all supported x86-based versions of Windows 7
File nameFile versionFile sizeDateTimePlatform
Winlogon.exe6.1.7600.20574285,69613-Nov-200909:35x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Winlogon.exe6.1.7600.20574389,63213-Nov-200910:37x64
For all supported IA-64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Winlogon.exe6.1.7600.20574786,94413-Nov-200908:52IA-64

STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
REFERENCE
For more information about how to start your computer in safe mode, visit the following Microsoft Web site: For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Properties

Article ID: 977542 - Last Review: 12/08/2009 16:39:23 - Revision: 2.0

  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Enterprise
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Standard
  • kbqfe kbhotfixserver kbfix kbsurveynew kbautohotfix KB977542
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