![]() You cannot use AppLocker (or Software Restriction Policies) to prevent code from running outside the Win32 subsystem. If it is a requirement to prevent 16-bit applications from running, you must configure the Deny rule in the Executable rule collection for NTVDM.exe. The result is that 16-bit binaries can still run on Windows Server 2008 R2 and Windows 7 when AppLocker is configured to otherwise block binaries and libraries. This technology allows running legacy DOS and 16-bit Windows programs on computers that are using Intel 80386 or later when there is already another operating system running and controlling the hardware. When securing files in a directory with a rule of the path condition type, whether using the allow or deny action on the rule, it is still necessary and good practice to restrict access to those files by setting the access control lists (ACLs) according to your security policy.ĪppLocker does not protect against running 16-bit DOS binaries in the Virtual DOS Machine (NTVDM). If the local computer is not joined to a domain and is not administered by Group Policy, a person with administrative credentials can alter the AppLocker policy. However, because AppLocker rules are additive, a local policy that is not in a GPO will still be evaluated for that computer. If a user with administrative credentials makes changes to an AppLocker policy on a local computer that is joined to a domain, those changes could be overwritten or disallowed by the GPO that contains the AppLocker rule for the same file (or path) that was changed on the local computer. This security context has the potential of misuse. For information about the Windows PowerShell cmdlets for AppLocker, see the AppLocker PowerShell Command Reference.ĪppLocker runs in the context of Administrator or LocalSystem, which is the highest privilege set. A user with administrator credentials can automate some AppLocker processes by using Windows PowerShell cmdlets. Microsoft does not provide a way to develop any extensions to AppLocker. The enforcement settings for local policies are overridden by the same AppLocker policies in a Group Policy Object (GPO). But AppLocker policies can also be set on individual computers if the person has administrator privileges, and those policies might be contrary to the organization's written security policy. This makes its policy creation and deployment conform to similar policy deployment processes and security restrictions.ĪppLocker policies are distributed through known processes and by known means within the domain through Group Policy. The following are security considerations for AppLocker:ĪppLocker is deployed within an enterprise and administered centrally by those in IT with trusted credentials. The purpose of AppLocker is to restrict the access to software, and therefore, the data accessed by the software, to a specific group of users or within a defined business group. This topic for the IT professional describes the security considerations you need to address when implementing AppLocker. Applies To: Windows 8.1, Windows Server 2008 R2, Windows Server 2012 R2, Windows Server 2012, Windows 8
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