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  • Heads up: Microsoft posts a fix for that SMBv3 security hole. Get ready to install this month’s Windows patches.

    Posted on March 12th, 2020 at 10:57 woody Comment on the AskWoody Lounge

    Microsoft just released the patch that it almost released on Tuesday. It’s the SMBv3 patch that’s set the security community on fire.

    KB 4551762, which fixes CVE-2020-0796 is a regular, old-fashioned Win10 cumulative update, but it’s only made for Win10 1903, 1909, Server  1903 Core and Server 1909 Core. (I still have no idea why only Server Core versions are affected.)

    Anyway, I’m going to keep my eyes open for any obvious problems and, if the coast looks reasonably clear, we may be moving to MS-DEFCON 3 or 4 pretty quickly.

    For now, hold off. There are no known exploits. But be ready to twitch that clicking finger.

    Will keep you posted.

    UPDATE: 24 hours later, I still haven’t seen an in-the-wild exploit. But there are many reports of a repeat of the “missing icon”/temporary profile bug associated with KB 4551762.

    Kevin Beaumont tweeted:

    For anybody pondering, I’ve tried various exploits for CVE-2020-0796 – with a default config and vulnerable Windows 10 install, Windows Defender detects the exploit attempt. If you have automatic updates enabled you will also have the patch already.

    It’s a significant security hole, but it doesn’t appear to be an imminent threat.

    Mayank Parmar has a recounting of the bugs in Windows Latest.

    Still watching.