![]() To resolve these issues, Microsoft is working together with Intel to develop software mitigations and guidance. Software updates to help mitigate the vulnerabilities have been released. To obtain all available protections, updates may be required that could also include microcode from device OEMs. Note: These vulnerabilities affect Intel Core processors and Intel Xeon processors only. Windows client operating systems are also at risk, especially if they run untrusted code, leverage Virtualization Based Security features like Windows Defender Credential Guard, or use Hyper-V to run virtual machines. Attackers who can run arbitrary code (regardless of its level of privilege) may be able to access operating system or workload secrets such as encryption keys, passwords, and other sensitive data. Server workloads such as Windows Server Remote Desktop Services (RDS) and more dedicated roles such as Active Directory domain controllers are also at risk. In environments in which resources are shared, such as virtualization hosts, an attacker who can run arbitrary code on one virtual machine may be able to access information from another virtual machine or from the virtualization host itself. See Microsoft Knowledge Base Article 4073119 for more information. See Microsoft Knowledge Base Article 4072698 for more information.īy default, operating systems protections are enabled for all Windows Client OS Editions. Please note the following:īy default, operating systems protections are enabled for some Windows Server OS Editions. Microsoft has released updates to help mitigate this vulnerability. UPDATED ON NOVEMBER 12, 2019: On November 12, 2019, Intel published a technical advisory around Intel® Transactional Synchronization Extensions (Intel® TSX) Transaction Asynchronous Abort vulnerability that is assigned CVE-2019-11135. They have been assigned the following CVEs:ĬVE-2018-11091 | Microarchitectural Data Sampling Uncacheable Memory (MDSUM)ĬVE-2018-12126 | Microarchitectural Store Buffer Data Sampling (MSBDS)ĬVE-2018-12127 | Microarchitectural Fill Buffer Data Sampling (MFBDS)ĬVE-2018-12130 | Microarchitectural Load Port Data Sampling (MLPDS) ![]() UPDATED ON May 14, 2019: On May 14, 2019, Intel published information about a new subclass of speculative execution side-channel vulnerabilities known as Microarchitectural Data Sampling. ![]() ![]() An attacker who can successfully exploit L1TF or MDS may be able to read privileged data across trust boundaries. The variants are named L1 Terminal Fault (L1TF) and Microarchitectural Data Sampling (MDS). Microsoft is aware of new variants of the class of attack known as speculative execution side-channel vulnerabilities.
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