System Software From Developer Was Blocked From Loading Mac

macOS High Sierra 10.13 introduced a new security feature that requires manual user approval before loading new third-party kernel extensions.

User Approved Kernel Extension Loading

To improve security on the Mac, kernel extensions installed with or after the installation of macOS High Sierra require user consent in order to load. This is known as User Approved Kernel Extension Loading. Any user can approve a kernel extension, even if they don’t have administrator privileges.

May 07, 2020 Click Allow next to System software from developer 'ESET, spol. Was blocked from loading. Allow button is disabled. In some cases, the Allow button might be disabled. Possible reasons for this include: Physical access to the computer is required to allow the kernel extensions. Some system software was blocked from loading. System software from developer “Razer USA Ltd.” was blocked from loading. Click on Allow button, a pane will drop down, select “Razer USA Ltd.” and click OK. And they should remove that Mac supports so it will not mislead people like us. Original Poster 3 points 2 years ago.

Allow Avast Software extensions. After installing Avast Security, you may see the status message This Mac is in passive mode. This is because the Core Shields are disabled due to the Avast Software extensions being blocked by your macOS. To allow Avast Software extensions, follow the instructions below: Click Core Shields, then select Open.
Jan 23, 2019 System software from developer 'Legacy Developer:driver' was blocked from loading. Okay so first I did a research. I find out that Apple is trying to improve security on the mac OS, and starting with macOS High Sierra kernel extensions that are.

A walk-through of the user approval process

When a user installs an application on a Mac (either from a local source or via Managed Software Center) which loads a third-party extension, the load request is denied and macOS presents the alert shown in Figure 1.

Figure 1 — The 'System Extension Blocked' dialog which you would see if you have installed the GlobalProtect VPN application for the first time.

Click on the button labeled 'Open Security Preferences', which will take you to the Security & Privacy panel of Systems Preferences (as shown in Figure 2).

NOTE: If you click the 'OK' button instead, you have 30 minutes in which to navigate to the Security & Privacy System Preference before the Allow button disappears. You would then need to restart the Mac in order to approve the system extension(s).

Figure 2— User approval to load the third-party extension. In this example, selecting 'Allow' will enable loading of kernel extensions from Palo Alto Networks, developers of the GlobalProtect VPN client.

Click on the 'Allow' button to enable the kernel extension to load so that this application (and any other applications by the same developer) will function properly on the Mac. You will be prompted if a restart is required at this time.

Which applications require user approval?

Below is a short list of the third-party applications you would be most likely to encounter at WCER which may require manual approval:

• Box Drive (cloud storage and collaboration application)

• Cisco System's AMP for Endpoints Connector (antivirus and malware protection)

• Palo Alto Networks GlobalProtect (VPN client)

• VMWare Fusion (virtual machine application)

PLEASE NOTE:If any of these applications were already installed when you received your Mac, then the Tech Services administrator would have already approved them so you should not be prompted for approval.

Technical Note TN2459

macOS High Sierra 10.13 introduces a new feature that requires user approval before loading new third-party kernel extensions. This feature will require changes to some apps and installers in order to preserve the desired user experience. This technote is for developers who ship kernel extensions to users and system administrators who need to install kernel extensions.

Introduction

macOS High Sierra 10.13 introduces a new feature that requires user approval before loading newly-installed third-party kernel extensions (KEXTs). When a request is made to load a KEXT that the user has not yet approved, the load request is denied. Apps or installers that treat a KEXT load failure as a hard error will need to be changed to handle this new case.

Approval is automatically granted to third-party KEXTs that were already present when upgrading to macOS High Sierra.

Note that approval doesn't guarantee that a KEXT is compatible and won't panic the system. The reason this feature exists is to give users more control over what KEXTs will load, which should reduce the number of panics.

In-Depth Explanation

This feature enforces that only kernel extensions approved by the user will be loaded on a system. When a request is made to load a KEXT that the user has not yet approved, the load request is denied and macOS presents the alert shown in Figure 1.

This prompts the user to approve the KEXT in System Preferences > Security & Privacy as shown in Figure 2.

This approval UI is only present in the Security & Privacy preferences pane for 30 minutes after the alert. Until the user approves the KEXT, future load attempts will cause the approval UI to reappear but will not trigger another user alert.

The alert shows the name of the developer who signed the KEXT so the user has some information to decide whether to approve the KEXT. This name comes from the Subject Common Name field of the Developer ID Application certificate used to sign the KEXT. Because of this, developers are encouraged to provide an appropriate company name when requesting KEXT signing identities.

When the user approves a KEXT, they are at the same time approving these other KEXTs signed by the same Team ID:

If the approved KEXT is located in an application's bundle, all other KEXTs signed by the same Team ID in the same application's bundle are also approved.
If the approved KEXT is located in the app's sub-directory inside /Library/Application Support, all other KEXTs signed by the same Team ID found in that same sub-directory are also approved.
All KEXTs in /Library/Extensions signed by the same Team ID are also approved.

Once approved, the KEXT will immediately be loaded or added to the prelinked kernel cache, depending on what action was blocked. Subsequent requests to load the KEXT will proceed silently as on previous macOS versions.

Approved KEXTs are tracked in a system-wide policy database through the team identifier in the KEXT's code signature and the bundle identifier from the KEXT's Info.plist, so updating a KEXT that has already been approved will not trigger a new approval request.

How This Affects KEXT Developers

Installers and applications that load kernel extensions may need to be revised to gracefully handle the kernel extension failing to load. Many products treat a KEXT loading failure as a hard failure. Some prompt the user to reinstall, some present a cryptic error message, and some simply don't function.

Starting with macOS High Sierra, installers and apps that load KEXTs should expect that KEXT loading will fail if the user hasn't approved their KEXT. Instead of treating this as an error, the user should be informed that they may need to approve the KEXT.

To determine if a KEXT has failed to load because it does not have user approval:

If you are using kextutil or kextload, check for the exit code 27. In addition, kextutil will produce the error message System policy prevents loading the kernel extension.
If you are using the KextManager APIs in IOKit/kext/KextManager.h, check for the result code kOSKextReturnSystemPolicy.

How This Affects Enterprise App Distribution

For enterprise deployments where it is necessary to distribute software that includes kernel extensions without requiring user approval, there are two options:

If your workflow is based on imaging, boot into Recovery OS and use the spctl kext-consent command. For detailed information about the spctl command, run the command spctl help. This command can either disable the user approval requirement completely or specify a list of Team IDs whose KEXTs may be loaded without user approval. The spctl command works in any installation environment, including Recovery OS and from NetBoot/NetInstall/NetRestore images.
Note that the Team ID list maintained by spctl is separate from the system-wide policy database.
For workflows that leverage Mobile Device Management (MDM), please see the AppleCare support article Prepare for changes to kernel extensions in macOS High Sierra.

To reiterate, all third-party KEXTs that were already installed at the time of upgrading to macOS High Sierra are automatically approved and don't require any user action.

Document Revision History

Date	Notes
2018-04-19	Updated for MDM changes in macOS 10.13.4.
2017-09-08	Updated for macOS High Sierra beta 8.
2017-08-04	Updated for macOS High Sierra beta 4.
2017-07-12	Updated for macOS High Sierra beta 3.
2017-06-19	New document that describes the user-approved kernel extension loading feature introduced in macOS High Sierra.