Efi Usb Device (sandisk) Has Been Blocked By The Current Security Policy

[Toney Talbot]

Whydoes the EFI USB device has been blocked error appears? The EFI USB device has been blocked by the current security policy error message indicating that the security policy has blocked the drive. More specifically, the Secure Boot feature blocks the drive.

Secure Boot is a feature in UEFI and legacy BIOS. It protects the PC startup process by preventing any malicious programs from loading. Malware may load your operating system without any indication. Secure Boot takes precautions against not loading them. However, this feature is enabled by default and it turns out that disabling them can resolve this bug.

Device control capabilities in Microsoft Defender for Endpoint enable your security team to control whether users can install and use peripheral devices, like removable storage (USB thumb drives, CDs, disks, etc.), printers, Bluetooth devices, or other devices with their computers. Your security team can configure device control policies to configure rules like these:

Device control helps protect your organization from potential data loss, malware, or other cyberthreats by allowing or preventing certain devices to be connected to users' computers. With device control, your security team can determine whether and what peripheral devices users can install and use on their computers.

As a companion to this article, see our Microsoft Defender for Endpoint setup guide to review best practices and learn about essential tools such as attack surface reduction and next-generation protection. For a customized experience based on your environment, you can access the Defender for Endpoint automated setup guide in the Microsoft 365 admin center.

Device control capabilities from Microsoft can be organized into three main categories: device control in Windows, device control in Defender for Endpoint, and Endpoint Data Loss Prevention (Endpoint DLP).

Device control in Windows. The Windows operating system has built-in device control capabilities. Your security team can configure device installation settings to prevent (or allow) users from installing certain devices on their computers. Policies are applied at the device level, and use various device properties to determine whether or not a user can install/use a device. Device control in Windows works with BitLocker and ADMX templates, and can be managed using Intune.

BitLocker. BitLocker is a Windows security feature that provides encryption for entire volumes. BitLocker encryption can be required for writing to removable media. Together with Intune, policies can be configured to enforce encryption on devices using BitLocker for Windows. For more information, see Disk encryption policy settings for endpoint security in Intune.

Endpoint data loss prevention (Endpoint DLP). Endpoint DLP monitors sensitive information on devices that are onboarded to Microsoft Purview solutions. DLP policies can enforce protective actions on sensitive information and where it's stored or used. Learn about Endpoint DLP.

The device installation restrictions available in Windows allow or deny the installation of drivers based on the device ID, device instance ID or set-up class. This can block any device in the device manager including all removable devices. When device installation restrictions are applied, the device is blocked in the device manager, as shown in the following screenshot:

Device control for Defender for Endpoint provides finer grain access control to a subset of USB devices. Device control can only restrict access to Windows Portal Devices, Removable Media, CD/DVDs and Printers.

On Windows, the term removable media devices does not mean any USB device. Not all USB devices are removable media devices. In order to be considered a removable media device and therefore in scope of MDE device control, the device must create a disk (such as E: ) in Windows. Device control can restrict access to the device and files on that device by defining policies.

Some devices create multiple entries in the Windows device manager (for example a removable media device and a Windows portable device). In order for the device to function properly make sure to grant access for all entries associated with the physical device. If a policy is configured with an audit entry, then an event will appear in Advanced Hunting with an ActionType of RemovableStoragePolicyTriggered.

Device control for Microsoft Defender for Endpoint controls access to a device based on its BitLocker encrypted state (encrypted or plain). This allows for exceptions to be created to allow and audit access to non-BitLocker encrypted devices.

Administrators can control the behavior of the Bluetooth service (Allowing advertising, discovery, preparing and prompting) as well as the Bluetooth services that are allowed. For more information, see Windows Bluetooth.

Device control in Defender for Endpoint provides your security team with a robust access control model that enables a wide range of scenarios (see Device control policies). We have put together a GitHub repository that contains samples and scenarios you can explore. See the following resources:

Device control in Defender for Endpoint can be applied to devices running Windows 10 or Windows 11 that have the anti-malware client version 4.18.2103.3 or later. (Currently, servers are not supported.)

The authselect-compat package is required by the auth and authconfig Kickstart commands during installation. Without this package, the installation fails if auth or authconfig are used. However, by design, the authselect-compat package is only available in the AppStream repository.

Performing a RHEL installation with the reboot --kexec Kickstart command or the inst.kexec kernel boot parameters do not provide the same predictable system state as a full reboot. As a consequence, switching to the installed system without rebooting can produce unpredictable results.

Several installation features require network access, for example, registration of a system using the Content Delivery Network (CDN), NTP server support, and network installation sources. However, network access is not enabled by default, and as a result, these features cannot be used until network access is enabled.

To work around this problem, add ip=dhcp to boot options to enable network access when the installation starts. Optionally, passing a Kickstart file or a repository located on the network using boot options also resolves the problem. As a result, the network-based installation features can be used.

The Encrypt my data radio button is not available when you choose the Custom partitioning during the system installation. As a result, your data is not encrypted when installation is complete.

When using a Kickstart file to perform an automated installation, the installation program attempts to perform automatic partitioning even when you do not specify any partitioning commands in the Kickstart file. The installation program behaves as if the autopart command was used in the Kickstart file, resulting in unexpected partitions. To work around this problem, use the reqpart command in the Kickstart file so that you can interactively configure manual partitioning.

Image Builder users that are upgrading from the lorax-composer back end to the new osbuild-composer back end, blueprints can disappear. As a result, once the upgrade is complete, the blueprints do not display automatically. To work around this problem, perform the following steps.

To install a RHEL for Edge image, users must create a blueprint to build a rhel-edge-container image and also create a Kickstart file to install the RHEL for Edge image. When a user adds the same username, password, and SSH key in both the blueprint and the Kickstart file, the RHEL for Edge image installation fails. Currently, there is no workaround.

Since RHEL 8.2, when registering your system and attaching subscriptions using the Content Delivery Network (CDN), a refresh of the repository metadata is started by the GUI installation program. The refresh process is not part of the registration and subscription process, and as a consequence, the Unregister button is enabled in the Connect to Red Hat window. Depending on the network connection, the refresh process might take more than a minute to complete. If you click the Unregister button before the refresh process is completed, the GUI installation might fail as the unregister process removes the CDN repository files and the certificates required by the installation program to communicate with the CDN.

Currently, when you attempt to register a system with a user account that belongs to multiple organizations, the registration process fails with the error message You must specify an organization for new units.

Installing RHEL using autopart with multiple inconsistent disk sector sizes fails. As a workaround, use a plain partitioning scheme, for example autopart --type=plain, instead of the default LVM scheme. Another option is to try re-configuring sector sizes, for example by running hdparm --set-sector-size= .

Sometimes, Storage Area Networks (SANs) fail to acknowledge the open and read disk calls. Previously, the GRUB tool used to enter into the grub_rescue prompt resulting in the boot failure. With this update, GRUB retries to access the disk up to 20 times after the initial call to open and read the disk fails. If the GRUB tool is still unable to open or read the disk after these attempts, it will enter into the grub_rescue mode.

IBM Power Systems with HASH memory allocation unit (MMU) mode support kdump up to a maximum of 192 cores. Consequently, the system fails to boot with memory allocation failures if kdump is enabled on more than 192 cores. This limitation is due to RMA memory allocations during early boot in HASH MMU mode. To work around this problem, use the Radix MMU mode with fadump enabled instead of using kdump.

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