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How to enable Structured Exception Handling Overwrite Protection (SEHOP) in Windows operating systems
Article ID: 956607 - View products that this article applies to.
Support for Windows Vista Service Pack 1 (SP1) ends on July 12, 2011. To continue receiving security updates for Windows, make sure you're running Windows Vista with Service Pack 2 (SP2). For more information, refer to this Microsoft web page: Support is ending for some versions of Windows
Windows Vista Service Pack 1, Windows 7, Windows Server 2008 and Windows Server 2008 R2 now include support for Structured Exception Handling Overwrite Protection (SEHOP). This feature is designed to block exploits that use the Structured Exception Handler (SEH) overwrite technique. This protection mechanism is provided at run-time. Therefore, it helps protect applications regardless of whether they have been compiled with the latest improvements, such as the /SAFESEH option. We recommend that Windows users who are running any of the above operating systems enable this feature to improve the security profile of their systems.
This article helps you enable this feature.
To have us enable this feature for you, go to the "Enable it for me" section. If you would rather enable this feature yourself, go to the "Let me enable it myself" section.
Note If you are running Windows 7 or Windows Server 2008 R2, go to the " Let me enable it myself" section because the automatic wizard for Windows 7 and for Windows Server 2008 R2 is not available yet.
To enable this feature automatically, click the Fix this problem link. Then, click Run in the File Download dialog box, and follow the steps in this wizard.
Fix this problem
Microsoft Fix it 50096
(http://blogs.technet.com/fixit4me/), or send us an e-mail
(mailto:email@example.com?Subject=KB956607 - Enable Structured Exception Handling Overwrite Protection)message.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756By default, SEHOP is enabled in Windows Server 2008 R2 and in Windows Server 2008. By default, SEHOP is disabled in Windows 7 and in Windows Vista. To enable SEHOP manually, follow these steps:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
Known IssuesAfter you enable SEHOP, existing versions of Cygwin, Skype, and Armadillo-protected applications may not work correctly.
Note To resolve this issue, contact the software vendor for an update.
Preventing the exploitation of SEH overwritesFor more information about a technique that you can use to help prevent the exploitation of SEH overwrites, visit the following Uninformed Web site:
http://www.uninformed.org/?v=5&a=2&t=txtThe third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.
Article ID: 956607 - Last Review: June 10, 2011 - Revision: 3.1