MS10-046: Vulnerability in Windows Shell could allow remote code execution

• Home users:
  http://www.microsoft.com/security/updates/bulletins/201008.aspx (http://www.microsoft.com/security/updates/bulletins/201008.aspx)
  Skip the details: Download the updates for your home computer or laptop from the Microsoft Update website now:
  http://update.microsoft.com/microsoftupdate/ (http://update.microsoft.com/microsoftupdate/)
• IT professionals:
  http://www.microsoft.coma/technet/security/bulletin/ms10-046.mspx (http://www.microsoft.com/technet/security/bulletin/ms10-046.mspx)

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How to obtain help and support for this security update

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Using the interactive method

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Locate and then select the following registry key:
   HKEY_CLASSES_ROOT\lnkfile\shellex\IconHandler
3. Click the File menu, and then click Export.
4. In the Export Registry File dialog box, type LNK_Icon_Backup.reg and then click Save.
   Note This step creates a backup of this registry key in the My Documents folder by default.
5. Select the value (Default) on the right pane in Registry Editor. Press ENTER to edit the value of the key. Delete the value so that the value is blank, and then press ENTER.
6. Locate and then select the following registry key:
   HKEY_CLASSES_ROOT\piffile\shellex\IconHandler
7. Click the File menu, and then click Export.
8. In the Export Registry File dialog box, type PIF_Icon_Backup.reg, and then click Save.
   Note This step creates a backup of this registry key in the My Documents folder by default.
9. Select the value (Default) on the right pane in Registry Editor. Press ENTER to edit the value of the key. Delete the value so that the value is blank, and then press ENTER.

Impact of the workaround

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How to undo the workarounds

How to undo the interactive method

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. On the File menu, click Import.
3. In the Import Registry File dialog box, select LNK_Icon_Backup.reg, and then click Open.
4. On the File menu, click Import.
5. In the Import Registry File dialog box, select PIF_Icon_Backup.reg, and then click Open.
6. Exit Registry Editor, and then restart the computer.

How to manually reset the registry key values to the default values

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Locate and then click the following registry key:
   HKEY_CLASSES_ROOT\lnkfile\shellex\IconHandler
3. Reset the registry key value to the following:
   {00021401-0000-0000-C000-000000000046}
4. Locate and then click the following registry key:
   HKEY_CLASSES_ROOT\piffile\shellex\IconHandler
5. Reset the registry key value to the following:
   {00021401-0000-0000-C000-000000000046}
6. Restart the computer
   

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Windows XP and Windows Server 2003 file information

• The files that apply to a specific milestone (RTM, SPn) and service branch (QFE, GDR) are noted in the "SP requirement" and "Service branch" columns.
• GDR service branches contain only those fixes that are widely released to address widespread, critical issues. QFE service branches contain hotfixes in addition to widely released fixes.
• In addition to the files that are listed in these tables, this software update also installs an associated security catalog file (KB number .cat) that is signed with a Microsoft digital signature.

For all supported x86-based versions of Windows XP

For all supported x64-based versions of Windows Server 2003 and of Windows XP Professional x64 edition

For all supported x86-based versions of Windows Server 2003

For all supported IA-64-based versions of Windows Server 2003

Windows Vista and Windows Server 2008 file information notes

• 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:
  
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  Version	Product	Milestone	Service branch
  6.0.6000.16xxx	Windows Vista	RTM	GDR
  6.0.6000.20xxx	Windows Vista	RTM	LDR
  6.0.6001.18xxx	Windows Vista SP1 and Windows Server 2008 SP1	SP1	GDR
  6.0.6001.22xxx	Windows Vista SP1 and Windows Server 2008 SP1	SP1	LDR
  6.0.6002.18xxx	Windows Vista SP2 and Windows Server 2008 SP2	SP2	GDR
  6.0.6002.22xxx	Windows Vista SP2 and Windows Server 2008 SP2	SP2	LDR

• Service Pack 1 is integrated into the original release version of Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.
• GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
• The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 and for Windows Vista" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2008 and of Windows Vista

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

For all supported IA-64-based versions of Windows Server 2008

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Windows 7 and Windows Server 2008 R2 file information notes

• 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:
  
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  Version	Product	Milestone	Service branch
  6.1.7600.16xxx	Windows 7 and Windows Server 2008 R2	RTM	GDR
  6.1.7600.20xxx	Windows 7 and Windows Server 2008 R2	RTM	LDR

• GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
• The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

For all supported x64-based versions of Windows Server 2008 R2 and of Windows 7

For all supported IA-64-based versions of Windows Server 2008 R2

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Additional file information for Windows Server 2008 and for Windows Vista

Additional files for all supported x86-based versions of Windows Server 2008 and of Windows Vista

Additional files for all supported x64-based versions of Windows Server 2008 and of Windows Vista

Additional files for all supported IA-64-based versions of Windows Server 2008

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Additional file information for Windows 7 and Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7

Additional files for all supported x64-based versions of Windows 7 and Windows Server 2008 R2

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

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