diff --git a/windows/client-management/azure-active-directory-integration-with-mdm.md b/windows/client-management/azure-active-directory-integration-with-mdm.md index d02f1b1f53..7e49be291f 100644 --- a/windows/client-management/azure-active-directory-integration-with-mdm.md +++ b/windows/client-management/azure-active-directory-integration-with-mdm.md @@ -202,9 +202,9 @@ The following table shows the required information to create an entry in the Azu ### Add on-premises MDM to the app gallery -There are no special requirements for adding on-premises MDM to the app gallery. There's a generic entry for administrator to add an app to their tenant. +There are no special requirements for adding on-premises MDM to the app gallery. There's a generic entry for administrators to add an app to their tenant. -However, key management is different for on-premises MDM. You must obtain the client ID (app ID) and key assigned to the MDM app within the customer's tenant. Thee ID and key obtain authorization to access the Microsoft Graph API and for reporting device compliance. +However, key management is different for on-premises MDM. You must obtain the client ID (app ID) and key assigned to the MDM app within the customer's tenant. The ID and key obtain authorization to access the Microsoft Graph API and for reporting device compliance. ## Themes diff --git a/windows/configuration/kiosk-policies.md b/windows/configuration/kiosk-policies.md index dec9776934..32f8c08e76 100644 --- a/windows/configuration/kiosk-policies.md +++ b/windows/configuration/kiosk-policies.md @@ -56,7 +56,7 @@ Remove Task Manager | Enabled Remove Change Password option in Security Options UI | Enabled Remove Sign Out option in Security Options UI | Enabled Remove All Programs list from the Start Menu | Enabled – Remove and disable setting -Prevent access to drives from My Computer | Enabled - Restrict all drivers +Prevent access to drives from My Computer | Enabled - Restrict all drives >[!NOTE] >When **Prevent access to drives from My Computer** is enabled, users can browse the directory structure in File Explorer, but they cannot open folders and access the contents. Also, they cannot use the **Run** dialog box or the **Map Network Drive** dialog box to view the directories on these drives. The icons representing the specified drives still appear in File Explorer, but if users double-click the icons, a message appears explaining that a setting prevents the action. This setting does not prevent users from using programs to access local and network drives. It does not prevent users from using the Disk Management snap-in to view and change drive characteristics. diff --git a/windows/security/information-protection/bitlocker/bitlocker-countermeasures.md b/windows/security/information-protection/bitlocker/bitlocker-countermeasures.md index e515250330..03c95bbdde 100644 --- a/windows/security/information-protection/bitlocker/bitlocker-countermeasures.md +++ b/windows/security/information-protection/bitlocker/bitlocker-countermeasures.md @@ -155,6 +155,12 @@ It also blocks automatic or manual attempts to move the paging file. Enable secure boot and mandatorily prompt a password to change BIOS settings. For customers requiring protection against these advanced attacks, configure a TPM+PIN protector, disable Standby power management, and shut down or hibernate the device before it leaves the control of an authorized user. +### Tricking BitLocker to pass the key to a rogue operating system + +An attacker might modify the boot manager configuration database (BCD) which is stored on a non-encrypted partition and add an entry point to a rogue operating system on a different partition. During the boot process, BitLocker code will make sure that the operating system that the encryption key obtained from the TPM is given to, is cryptographically verified to be the intended recipient. Because this strong cryptographic verification already exists, we don’t recommend storing a hash of a disk partition table in Platform Configuration Register (PCR) 5. + +An attacker might also replace the entire operating system disk while preserving the platform hardware and firmware and could then extract a protected BitLocker key blob from the metadata of the victim OS partition. The attacker could then attempt to unseal that BitLocker key blob by calling the TPM API from an operating system under their control. This will not succeed because when Windows seals the BitLocker key to the TPM, it does it with a PCR 11 value of 0, and to successfully unseal the blob, PCR 11 in the TPM must have a value of 0. However, when the boot manager passes the control to any boot loader (legitimate or rogue) it always changes PCR 11 to a value of 1. Since the PCR 11 value is guaranteed to be different after exiting the boot manager, the attacker can't unlock the BitLocker key. + ## Attacker countermeasures The following sections cover mitigations for different types of attackers. diff --git a/windows/security/threat-protection/microsoft-defender-application-guard/configure-md-app-guard.md b/windows/security/threat-protection/microsoft-defender-application-guard/configure-md-app-guard.md index a00cec360b..c71d2b029e 100644 --- a/windows/security/threat-protection/microsoft-defender-application-guard/configure-md-app-guard.md +++ b/windows/security/threat-protection/microsoft-defender-application-guard/configure-md-app-guard.md @@ -60,7 +60,7 @@ These settings, located at `Computer Configuration\Administrative Templates\Wind |Configure Microsoft Defender Application Guard print settings|Windows 10 Enterprise, 1709 or higher

Windows 11 Enterprise|Determines whether Application Guard can use the print functionality.|**Enabled.** This is effective only in managed mode. Turns on the print functionality and lets you choose whether to additionally:
- Enable Application Guard to print into the XPS format.
- Enable Application Guard to print into the PDF format.
- Enable Application Guard to print to locally attached printers.
- Enable Application Guard to print from previously connected network printers. Employees can't search for other printers.

**Disabled or not configured.** Completely turns Off the print functionality for Application Guard.| |Allow Persistence|Windows 10 Enterprise, 1709 or higher

Windows 11 Enterprise|Determines whether data persists across different sessions in Microsoft Defender Application Guard.|**Enabled.** This is effective only in managed mode. Application Guard saves user-downloaded files and other items (such as, cookies, Favorites, and so on) for use in future Application Guard sessions.

**Disabled or not configured.** All user data within Application Guard is reset between sessions.

**NOTE**: If you later decide to stop supporting data persistence for your employees, you can use our Windows-provided utility to reset the container and to discard any personal data.

**To reset the container:**
1. Open a command-line program and navigate to `Windows/System32`.
2. Type `wdagtool.exe cleanup`. The container environment is reset, retaining only the employee-generated data.
3. Type `wdagtool.exe cleanup RESET_PERSISTENCE_LAYER`. The container environment is reset, including discarding all employee-generated data.| |Turn on Microsoft Defender Application Guard in Managed Mode|Windows 10 Enterprise, 1809 or higher

Windows 11 Enterprise|Determines whether to turn on Application Guard for Microsoft Edge and Microsoft Office.|**Enabled.** Turns on Application Guard for Microsoft Edge and/or Microsoft Office, honoring the network isolation settings, rendering untrusted content in the Application Guard container. Application Guard won't actually be turned on unless the required prerequisites and network isolation settings are already set on the device. Available options:
- Enable Microsoft Defender Application Guard only for Microsoft Edge
- Enable Microsoft Defender Application Guard only for Microsoft Office
- Enable Microsoft Defender Application Guard for both Microsoft Edge and Microsoft Office

**Disabled.** Turns off Application Guard, allowing all apps to run in Microsoft Edge and Microsoft Office.

**Note:** For Windows 10, if you have KB5014666 installed, and for Windows 11, if you have KB5014668 installed, you are no longer required to configure network isolation policy to enable Application Guard for Edge.| -|Allow files to download to host operating system|Windows 10 Enterprise or Pro, 1803 or higher

Windows 11 Enterprise or Pro|Determines whether to save downloaded files to the host operating system from the Microsoft Defender Application Guard container.|**Enabled.** This is effective only in managed mode. Allows users to save downloaded files from the Microsoft Defender Application Guard container to the host operating system. This action creates a share between the host and container that also allows for uploads from the host to the Application Guard container.

**Disabled or not configured.** Users aren't able to save downloaded files from Application Guard to the host operating system.| +|Allow files to download to host operating system|Windows 10 Enterprise or Pro, 1803 or higher

Windows 11 Enterprise or Pro|Determines whether to save downloaded files to the host operating system from the Microsoft Defender Application Guard container.|**Enabled.** Allows users to save downloaded files from the Microsoft Defender Application Guard container to the host operating system. This action creates a share between the host and container that also allows for uploads from the host to the Application Guard container.

**Disabled or not configured.** Users aren't able to save downloaded files from Application Guard to the host operating system.| |Allow hardware-accelerated rendering for Microsoft Defender Application Guard|Windows 10 Enterprise, 1803 or higher

Windows 11 Enterprise|Determines whether Microsoft Defender Application Guard renders graphics using hardware or software acceleration.|**Enabled.** This is effective only in managed mode. Microsoft Defender Application Guard uses Hyper-V to access supported, high-security rendering graphics hardware (GPUs). These GPUs improve rendering performance and battery life while using Microsoft Defender Application Guard, particularly for video playback and other graphics-intensive use cases. If this setting is enabled without connecting any high-security rendering graphics hardware, Microsoft Defender Application Guard will automatically revert to software-based (CPU) rendering. **Important:** Enabling this setting with potentially compromised graphics devices or drivers might pose a risk to the host device.

**Disabled or not configured.** Microsoft Defender Application Guard uses software-based (CPU) rendering and won’t load any third-party graphics drivers or interact with any connected graphics hardware.| |Allow camera and microphone access in Microsoft Defender Application Guard|Windows 10 Enterprise, 1809 or higher

Windows 11 Enterprise|Determines whether to allow camera and microphone access inside Microsoft Defender Application Guard.|**Enabled.** This is effective only in managed mode. Applications inside Microsoft Defender Application Guard are able to access the camera and microphone on the user's device. **Important:** Enabling this policy with a potentially compromised container could bypass camera and microphone permissions and access the camera and microphone without the user's knowledge.

**Disabled or not configured.** Applications inside Microsoft Defender Application Guard are unable to access the camera and microphone on the user's device.| |Allow Microsoft Defender Application Guard to use Root Certificate Authorities from a user's device|Windows 10 Enterprise or Pro, 1809 or higher

Windows 11 Enterprise or Pro|Determines whether Root Certificates are shared with Microsoft Defender Application Guard.|**Enabled.** Certificates matching the specified thumbprint are transferred into the container. Use a comma to separate multiple certificates.

**Disabled or not configured.** Certificates aren't shared with Microsoft Defender Application Guard.|