On January 3, 2018, Microsoft released advisories and security updates related to a recently discovered class of hardware vulnerabilities (known as Spectre and Meltdown) that affect AMD, ARM, and Intel CPUs. 

On May 21, 2018, Intel announced the Rogue System Registry Read vulnerability. Also a new subclass of speculative execution side channel vulnerabilities known as Speculative Store Bypass (SSB) has been announced.

Malicious users can exploit these vulnerabilities to bypass security restrictions and obtain sensitive information.

Below is a complete list of vulnerabilities:

1. Speculative store bypass vulnerability in Microsoft Windows systems can be exploited to bypass security restrictions;
2. Rogue System Registry Read vulnerability in Microsoft Surface Hardware can be exploited to obtain sensitive information.

Technical details

By exploiting vulnerability (1) attacker could then bypass Kernel Address Space Layout Randomization (KASLR) protections. An attacker would have to log on to an affected system. The mitigation for this vulnerability is exclusively through a microcode/firmware update, and there is no additional Microsoft Windows operating system update.

Vulnerability (2) can be exploited via vulnerable code patterns in the operating system (OS) or in applications. In the case of Just-in-Time (JIT) compilers, such as JavaScript JIT employed by web browsers, it may be possible for an attacker to supply JavaScript that produces native code that could give rise to an instance of CVE-2018-3639. However, major browsers have taken steps to increase the difficulty of exploting.

Windows Server, version 1803 (Server Core Installation)
Windows 10 for 32-bit Systems
Windows 10 for x64-based Systems
Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1703 for 32-bit Systems
Windows 10 Version 1703 for x64-based Systems
Windows 10 Version 1709 for 32-bit Systems
Windows 10 Version 1709 for 64-based Systems
Windows 10 Version 1803 for 32-bit Systems
Windows 10 Version 1803 for x64-based Systems
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows Server, version 1709 (Server Core Installation)

Look at Recommended Actions section in original advisories

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