vb.net free barcode component FIgURE 20-9 Internet Explorer protects elevated privileges . in C#

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FIgURE 20-9 Internet Explorer protects elevated privileges .
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Because Protected Mode also protects extensions, vulnerabilities in extensions, such as buffer overflows, cannot be exploited to access any part of the file system or other operating system object to which Protected Mode does not normally have access . Therefore, the damage that a successful exploit can cause is very limited .
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Defense-in-Depth
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rotected Mode is not the first line of defense against malware; it s a form of defense-in-depth. protected Mode offers protection in the event that a
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malicious Web page successfully bypasses the other security measures of Internet Explorer. In the case of a successful exploit, protected Mode restricts the processes privileges to limit the damage that malware can do. In other words, even if your browser gets hacked, protected Mode might still keep your computer safe.
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Improvements Previously Introduced in Internet Explorer 7
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CHapTER 20
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HOW THE pROTECTED MODE COMpaTIBILITY LaYER WORKS
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To minimize the impact of the strict security restrictions, Protected Mode provides a compatibility architecture that redirects some requests to protected resources and prompts the user to approve other requests . Figure 20-10 illustrates this behavior .
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IEInstal.exe admin broker (high rights) Administrative rights required
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Integrity mechanism
Internet Explorer 7 in Protected Mode (low rights)
IEUser.exe user broker (medium rights)
User rights required
Compatibility layer
Low rights required
FIgURE 20-10 Internet Explorer Protected Mode provides both security and compatibility .
The compatibility layer handles the needs of extensions written for earlier versions of Windows that require access to protected resources by redirecting the requests to safer locations . Specifically, the Documents folder is redirected to \%UserProfile%\AppData\Local \Microsoft\Windows\Temporary Internet Files\Virtualized, and the HKEY_CURRENT_USER registry hive is redirected to HKEY_CURRENT_USER\Software\Microsoft\InternetExplorer \InternetRegistry . The first time an add-on attempts to write to a protected object, the compatibility layer copies the object and then modifies the copy . After the first modification is made, the compatibility layer forces add-ons to read from the copy . The Internet Explorer compatibility layer virtualization is used instead of the Windows Vista and later operating systems UAC virtualization .
note
add-ons developed for Windows Vista and later operating systems can bypass the
compatibility layer to save a file by calling the Saveas application programming interface (apI), so no functionality is lost. To allow the user to select a location to save a file, call IEShowSaveFileDialog to prompt the user for a folder and then call IESaveFile to write the file. Use IEGetWriteableFolderPath and IEGetWriteableHKCU to find low-integrity locations to which your add-on can write. To determine whether protected Mode is active, call the IEIsProtectedModeProcess method. For more information, visit http://msdn.microsoft.com /en-us/library/ms537319.aspx.
Two higher-privilege broker processes allow Internet Explorer and extensions to perform elevated operations given user consent:
CHapTER 20 Managing Windows Internet Explorer
The User Broker (IEUser .exe) process provides a set of functions that lets the user save files to areas outside of low-integrity areas . The Admin Broker (IEInstal .exe) process allows Internet Explorer to install ActiveX controls .
HOW TO SOLVE pROTECTED MODE INCOMpaTIBILITIES
Some applications that were designed to work with Internet Explorer 6 might not work with Internet Explorer 7 or later versions on Windows Vista and later operating systems because of restrictions imposed by Protected Mode . Applications that are failing because of Protected Mode have the following characteristics:
Applications that use Iexplore .exe cannot write directly to disk while in the Internet zone . Applications might not know how to handle new Internet Explorer 7 or later versions or Windows Vista or later operating system prompts .
Before upgrading users to Internet Explorer 7 or later versions , whether upgrading the browser on Windows XP or upgrading users to Windows Vista or later operating systems, you need to ensure that critical Web applications still work correctly . Because Internet Explorer has a different rendering engine and higher security, some applications might not work correctly using the standard settings . If you do identify a compatibility problem, you should enable Compatibility Logging to help you isolate the exact cause of the problem . To enable Compatibility Logging using a Group Policy setting, enable the Turn On Compatibility Logging setting under Computer Configuration\Administrative Templates\Windows Components\Internet Explorer or User Configuration\Administrative Templates\Windows Components\Internet Explorer . For more information about Compatibility Logging, read Finding Security Compatibility Issues in Internet Explorer 7 at http://msdn.microsoft.com/en-us/library/bb250493.aspx . After using logging to identify the problem, you might be able to resolve Protected Mode incompatibilities using the following techniques:
Add the site in question to the Trusted Sites zone Sites in the Trusted Sites zone have more privileges than sites in other zones . For more information, read the section titled Security Zones later in this chapter . Change the application to handle Protected Mode, including responding to any related prompts that might be displayed Most applications can run successfully in Protected Mode if they are written to follow Microsoft best practices and use minimal privileges . However, many existing applications might not have been created to follow these guidelines . Work with your developers to design applications for Protected Mode . For more information, read Understanding and Working in Protected Mode Internet Explorer at http://msdn.microsoft.com/en-us/library/bb250462.aspx .
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