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Internet Explorer 7 and later versions include more than 1,200 Group Policy settings, enabling administrators to manage even the smallest aspects of Internet Explorer behavior . For detailed information about Internet Explorer Group Policy settings, read the section titled Managing Internet Explorer Using Group Policy later in this chapter .
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Improvements Previously Introduced in Internet Explorer 7 CHapTER 20 897
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Malware, a term used to describe malicious software such as spyware and adware, has had a significant negative impact on IT departments in recent years . Often, malware has been distributed through Web sites that either trick users into installing the software or bypass the Web browser s security features to install the software without the user s consent . Internet Explorer 7 has been hardened to reduce the potential for malicious Web sites to compromise a user s browser or the rest of the operating system . The sections that follow describe other improvements that reduce security risks when users browse the Web .
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Beginning with Windows Vista, Internet Explorer 7 and later versions run in Protected Mode, which helps protect users from attacks by running the Internet Explorer process with greatly restricted privileges . Protected Mode significantly reduces the ability of an attacker to write, alter, or destroy data on the user s computer or to install malicious code . Protected Mode is not available when Internet Explorer 7 and later versions are installed on Windows XP because it requires several security features unique to Windows Vista and later operating systems .
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When Internet Explorer runs in Protected Mode, Mandatory Integrity Control (MIC), a Windows Vista and later operating systems feature, forces Internet Explorer to be a low-integrity process . MIC does not allow low-integrity processes to gain write access to high-integrity level objects, such as files and registry keys, in a user s profile or system locations . Low-integrity processes can write only to folders, files, and registry keys that have been assigned a low-integrity MIC access control entry (ACE) known as a mandatory label . Table 20-1 describes the different integrity levels .
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TABlE 20-1 Mandatory Integrity Control Levels
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INTEgRITy ACCESS lEVEl
SySTEM PRIVIlEgES
High Medium
Administrative . Processes can install files to the Program Files folder and write to sensitive registry areas, such as HKEY_LOCAL_MACHINE . User . Processes can create and modify files in the user s Documents folder and write to user-specific areas of the registry, such as HKEY_CURRENT_USER . Most files and folders on a computer have a medium-integrity level because any object without a mandatory label has an implied default integrity level of Medium . Untrusted . Processes can write only to low-integrity locations, such as the Temporary Internet Files\Low folder or the HKEY_CURRENT_USER \Software\Microsoft\Internet Explorer\LowRegistry key .
As a result of being a low-integrity process, Internet Explorer and its extensions run in Protected Mode, which can write only to low-integrity locations, such as the new low-integrity
898 CHapTER 20 Managing Windows Internet Explorer
temporary Internet files folder, the History folder, the Cookies folder, the Favorites folder, and the Windows temporary file folders . By preventing unauthorized access to sensitive areas of a user s system, Protected Mode limits the amount of damage that a compromised Internet Explorer process can cause . An attacker cannot, for example, silently install a keystroke logger to the user s startup folder . Furthermore, the Protected Mode process runs with a low desktop integrity level . Because of User Interface Privilege Isolation (UIPI), a compromised process cannot manipulate applications on the desktop through window messages, thus helping to reduce the risk of shatter attacks . Shatter attacks compromise processes with elevated privileges by using window messages . If a Web page or add-on does require more privileges than provided by Protected Mode or the compatibility layer, it will prompt the user to grant those privileges using User Account Control (UAC) . This can occur, for example, if the user needs to install an add-on that requires elevated rights, as shown in Figure 20-9 . Most add-ons can run within Protected Mode, however, and loading them will not prompt the user .
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