Microsoft Security Advisory (912840): Vulnerability in Graphics Rendering Engine Could Allow Remote Code Execution.: «Un-register the Windows Picture and Fax Viewer (Shimgvw.dll) on Windows XP Service Pack 1; Windows XP Service Pack 2; Windows Server 2003 and Windows Server 2003 Service Pack 1

Microsoft has tested the following workaround. While this workaround will not correct the underlying vulnerability, it helps block known attack vectors. When a workaround reduces functionality, it is identified in the following section.

Note The following steps require Administrative privileges. It is recommended that the machine be restarted after applying this workaround. It is also possible to log out and log back in after applying the workaround. However, the recommendation is to restart the machine.

To un-register Shimgvw.dll, follow these steps:

1.

Click Start, click Run, type ‘regsvr32 -u %windir%\system32\shimgvw.dll’ (without the quotation marks), and then click OK.

2.

A dialog box appears to confirm that the un-registration process has succeeded. Click OK to close the dialog box.

Impact of Workaround: The Windows Picture and Fax Viewer will no longer be started when users click on a link to an image type that is associated with the Windows Picture and Fax Viewer.

To undo this change, re-register Shimgvw.dll by following the above steps. Replace the text in Step 1 with ?regsvr32 %windir%\system32\shimgvw.dll? (without the quotation marks).»

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