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password because a fake AAM dialog would just get you to click Continue and would not give any privileges due to the fact that the real elevation process would not have been activated Vista has other controls in place to stop malware from trying to harvest passwords using a fake UAC prompt
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FIGURE 4-42 The UAC consent dialog You can manually con gure the UAC via a number of methods, and you can use group policy settings for granular control These settings are available at Computer Con guration, Policies, Windows Settings, Security Settings, Local Policies, Security Options They are also available as local settings in the local computer policy for a server (and, indeed, a Vista client) In fact, the UAC con guration is stored in the local computer policy by default, but group policy can be used to override those settings The settings available for Windows Server 2008 and Windows Vista are shown here, and the defaults are consistent for both OSs:
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whether the AAM is used for the built-in administrator account By default, AAM is disabled for the built-in administrator account, but you can enable it by setting this policy to Enabled User Account Control: Allow UIAccess applications to prompt for elevation without using the secure desktop [Default Disabled] Applies to User Interface Accessibility (UIA) programs, particularly Remote Assistance and how elevation prompts are displayed By default, during a Remote Assistance session, any elevation prompts are displayed on the interactive user s session, and the Remote Assistance user gets a grayed-out screen If the Remote Assistance user needs to be answering the elevation prompts remotely, the elevation prompts cannot be displayed on the secure desktop and instead need to be displayed on the interactive desktop so that they are shown to the Remote Assistance session Setting this setting to Enabled con gures elevation prompts during UIA sessions to be displayed in the user desktop It should be noted that with Remote Assistance, the user can allow the Remote Assistance expert to respond to the UAC prompts, but doing so requires a UAC prompt itself, which kind of defeats the purpose and hence why we have this option User Account Control: Behavior of the elevation prompt for administrators in Admin Approval Mode [Default Prompt for consent] If administrators are con gured to run in the AAM, this option controls whether they are prompted for consent (the default), whether the administrator has to enter her credentials (Prompt for Credentials), or whether the administrator is not prompted and is elevated automatically (Elevate without Prompting) The last option should not be used because although UAC is in effect so you run as a normal user token, any time more privileges are needed, the elevation occurs automatically, defeating the purpose User Account Control: Behavior of the elevation prompt for standard users [Default Prompt for credentials] Controls how UAC works for nonadministrators By default, the user is prompted for an administrator set of credentials (an account and a password in a domain or an administrator account and a password in a workgroup) As an alternative, this can be set to Automatically Deny Elevation Requests, which means the user will not be prompted, and any action or process that requires elevation will fail
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User Account Control: Detect application installations and prompt for elevation [Default Enabled Allows Vista to detect whether an application installer that requires elevation is running, and if so, the elevation prompt will be displayed Setting this to Disabled turns off this check and suppresses the elevation dialog and would be used in environments where technologies such as group policy or System Center Con guration Manager (SCCM) are used to deploy software that uses delegated installation to avoid permission issues By default, this option is set to Disabled for Windows Vista Enterprise edition User Account Control: Only elevate executables that are signed and validated [Default Disabled] Allows only executables that are signed by a trusted certi cate chain to request elevation Because of the implications of the enterprise con guration needed to ensure that all the correct chains are trusted, this option is disabled by default, but in a locked-down environment, this setting can be useful to further protect systems from malware-type applications User Account Control: Only elevate UIAccess applications that are installed in secure locations [Default Enabled] Applies to the UIA applications and ensures that only applications in the normal program areas, such as under %systemroot%\ Program Files [(x86) for 64-bit also] and %windir%, can be treated as UIAccess applications per their manifest requests The manifest is a header for each program that makes statements about what the program does and things it needs Turning it off would allow applications installed anywhere to use the UIAccess UAC prompt options, which could be dangerous User Account Control: Run all administrators in Admin Approval Mode [Default Enabled] By default, all administrators except the built-in administrator account run in AAM and so are prompted for elevation consent/credentials (depending on the AAM setting for administrators) By default, Enabled is the optimal setting, and it should not be disabled as that would turn off UAC for all administrator accounts, and those are the users who need it the most User Account Control: Switch to the secure desktop when prompting for elevation [Default Enabled] Controls whether UAC elevation requests are displayed on the secure desktop (with
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