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Update bitlocker-countermeasures.md

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Added link to Intel Thunderbolt Security documentation for systems that do not support Kernel DMA Protection
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AaDake
2018-10-23 11:54:48 -07:00
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windows/security/information-protection/bitlocker/bitlocker-countermeasures.md
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@ -98,7 +98,7 @@ It requires direct ethernet connectivity to an enterprise Windows Deployment Ser
There are a few different options to protect DMA ports, such as Thunderbolt™3. There are a few different options to protect DMA ports, such as Thunderbolt™3.
Beginning with Windows 10 version 1803, new Intel-based devices have kernel protection against DMA attacks via Thunderbolt™ 3 ports enabled by default. Beginning with Windows 10 version 1803, new Intel-based devices have kernel protection against DMA attacks via Thunderbolt™ 3 ports enabled by default.
This kernel DMA protection is available only for new systems beginning with Windows 10 version 1803, as it requires changes in the system firmware and/or BIOS. This Kernel DMA Protection is available only for new systems beginning with Windows 10 version 1803, as it requires changes in the system firmware and/or BIOS.
You can use the System Information desktop app (MSINFO32) to check if a device has kernel DMA protection enabled: You can use the System Information desktop app (MSINFO32) to check if a device has kernel DMA protection enabled:
@ -107,7 +107,7 @@ You can use the System Information desktop app (MSINFO32) to check if a device h
If kernel DMA protection *not* enabled, follow these steps to protect Thunderbolt™ 3 enabled ports: If kernel DMA protection *not* enabled, follow these steps to protect Thunderbolt™ 3 enabled ports:
1. Require a password for BIOS changes 1. Require a password for BIOS changes
2. Intel Thunderbolt Security must be set to User Authorization in BIOS settings 2. Intel Thunderbolt Security must be set to User Authorization in BIOS settings. Please refer to [Intel Thunderbolt™ 3 and Security on Microsoft Windows® 10 Operating System documentation](https://thunderbolttechnology.net/security/Thunderbolt%203%20and%20Security.pdf)
3. Additional DMA security may be added by deploying policy (beginning with Windows 10 version 1607): 3. Additional DMA security may be added by deploying policy (beginning with Windows 10 version 1607):
- MDM: [DataProtection/AllowDirectMemoryAccess](https://docs.microsoft.com/windows/client-management/mdm/policy-csp-dataprotection#dataprotection-allowdirectmemoryaccess) policy - MDM: [DataProtection/AllowDirectMemoryAccess](https://docs.microsoft.com/windows/client-management/mdm/policy-csp-dataprotection#dataprotection-allowdirectmemoryaccess) policy