ZombieLoad is a new side CPU channel vulnerability which can be used by hackers to disclose sensitive data.  Users should patch promptly for this new POC attack.  As shared below, Microsoft just included this protection in the May 2019 Patch Tuesday security updates.

https://zombieloadattack.com/

Watch out! Your processor resurrects your private browsing-history and other sensitive data. After Meltdown, Spectre, and Foreshadow, we discovered more critical vulnerabilities in modern processors. The ZombieLoad attack allows stealing sensitive data and keys while the computer accesses them. While programs normally only see their own data, a malicious program can exploit the fill buffers to get hold of secrets currently processed by other running programs. These secrets can be user-level secrets, such as browser history, website content, user keys, and passwords, or system-level secrets, such as disk encryption keys.

The attack does not only work on personal computers but can also be exploited in the cloud. Make sure to get the latest updates for your operating system! ZombieLoad in Action In our demo, we show how an attacker can monitor the websites the victim is visiting despite using the privacy-protecting Tor browser in a virtual machine.

Microsoft May 2019 Patch Tuesday – ZombieLoad protection implemented

https://isc.sans.edu/forums/diary/Microsoft+May+2019+Patch+Tuesday/24934/

UPDATE: Today’s Patch Tuesday also addresses the new CPU side-channel attack published today known as Zombieload [1] (ADV190013). As Meltdown, Spectre, and Foreshadow the new flaw may allow an attacker to steal sensitive data and keys being processed by the CPU. To fix the issue you must apply OS updates provided by Microsoft today (not available for all versions yet) and firmware microcode from device OEMs. The details for this advisory are available at https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV190013.