Restart the computer for the changes to take effect. The VMs are also updated when they’re restarted. This enables the firmware-related mitigation to be applied on the host before the VMs are started. If this is a Hyper-V host and the firmware updates have been applied, fully shut down all VMs. Reg add "HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionVirtualization" /v MinVmVersionForCpuBasedMitigations /t REG_SZ /d "1.0" /f If the Hyper-V feature is installed, add the following registry setting: You may need to review various tech sites as to the tested performance hits after the patches have been installed. To enable these protections on Windows Server platforms, follow the guidance in KB4072698. To enable these protections (or disable them) on workstations, follow the guidance provided by Microsoft in KB4073119. Due to performance hits, Microsoft has enabled the protection on workstations by default, but left the decision up to you on server platforms. Then you will need to decide if you will enable protections. For systems with older processors that can’t receive protect, determine if these machines need to be processing any sensitive information. You may need to determine if Intel has released a firmware update for your CPU. Once again, the protections for MDS come from a combination of operating system and firmware updates. CVE-2018-12130: Microarchitectural Load Port Data Sampling (MLPDS).CVE-2018-12127: Microarchitectural Fill Buffer Data Sampling (MFBDS).CVE-2018-12126 : Microarchitectural Store Buffer Data Sampling (MSBDS).CVE-2018-11091: Microarchitectural Data Sampling Uncacheable Memory (MDSUM).The CVE numbers assigned to these vulnerabilities include: Attackers can exploit MDS to get around the security boundaries set by virtual machine hypervisors, OS kernels, and SGX enclaves. These vulnerabilities impact only Intel CPUs and allow attackers to eavesdrop on the information that the chip passes to other components. Windows update mitigates MDS attacksĪlso mitigated in the May updates is a new security vulnerability called microarchitectural data sampling (MDS). You must also have the necessary firmware from the OEM manufacturer. Windows patches alone won’t enable these new protections.
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