Windows 10: KB4100347 Intel microcode updates for Windows 10 v1803 - September 13

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  1.    4 Weeks Ago #140

    ddelo said: View Post
    AD, if WU offers it, it won't make any difference to the performance problem you're experiencing with the manual update. Check your manufacturer's site for an actual BIOS update. It's the recommended update. The MS microcode update is a workaround, until an actual BIOS update is provided by the manufacturer.
    How is a CPU workaround able to fix a vulnerability with the BIOS?
    Last edited by andyouf; 4 Weeks Ago at 04:53.
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  2.    4 Weeks Ago #141

    From https://meltdownattack.com Q&A

    Has Meltdown or Spectre been abused in the wild?

    We don't know.
    What does the question mean?
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  3.    4 Weeks Ago #142

    andyouf said: View Post
    The fact that the protection can be enabled and disabled. So I guess CPU firmware can be altered on the fly with a utility or did Intel build the ability to enable/disable protection into the code? Or is it done through the BIOS?
    Combination of uCode and registry settings.

    The uCode is loaded at hardware initialisation via UEFI or boot-patched into kernel via .dll (which is what is updated by the WU).

    The registry allows you to turn the protection on or off on the fly, but not the uCode.
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  4.    4 Weeks Ago #143

    andyouf said: View Post
    From https://meltdownattack.com Q&A

    What does the question mean?
    Has this exploit been successfully exploited?

    Answer: With current techniques it is impossible to tell. Spectre is well-named; as well as being named after Speculative Execution, it is a ghost as perfectly legal (and by that I mean non-viral) code is used to 'snoop' across memory boundaries or into other processes. This code can be program code or most likely Javascript; stuff like 'Site Isolation' and 'Kernel Page Table Isolation' give you some idea of the methods used to mitigate. Instructions like LFENCE, programming techniques such as 'retpoline' (portmanteau of return & trampoline) and 'timer-fuzzing' also give an idea of what is occuring.

    Another analogy is basically a man reading a newspaper and he sees you reading over his shoulder so he lifts the adjacent page to stop you seeing what he's reading. Basically you know he's reading pages 4 & 5 by the fact you get to read page 3 for free as long as he tries to shield it from you. When he leaves his seat and discards the paper on the seat or in the trash, you get the gold / dirt on pages 4 & 5.
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  5.    4 Weeks Ago #144

    Oh okay I didn't get the term at all. I read up on speculative execution, still don't quite get how it works but it seems great (except for the vulnerability part). The newspaper analogy I'm guessing is saying that content I viewed is discarded to memory to be viewed by a malicious user.
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  6.    4 Weeks Ago #145

    andyouf said: View Post
    How is a CPU workaround able to fix a vulnerability with the BIOS?
    By workaround, we mean that the microcode runs after boot, i.e after BIOS and stays in RAM until the next shutdown/reboot. The BIOS update, which is the recommended fix, is what it says. A BIOS update.
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  7.    4 Weeks Ago #146

    I got this update this morning after manually running a Windows Update check. WU ran an auto check earlier today and it wasn't there. A lot of people don't manually check WU for updates and will be missing this. One would think MS would make sure something this important would show up automatically.
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  8. Cliff S's Avatar
    Posts : 21,212
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
       4 Weeks Ago #147

    Hey @Brink, here is an odd one:

    I just got this(KB4100347) automatically through Windows update, and I already had 0x96 from the BIOS update our Maximus X boards had July 10th
    I had previously checked it(using CPU-Z's Validate) after you updated the thread, to see if I needed it.

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  9. Brink's Avatar
    Posts : 32,272
    64-bit Windows 10 Pro build 18242
    Thread Starter
       4 Weeks Ago #148

    It seems everyone is getting this one or the one below for Windows 10 v1803.

    KB4346084 Intel microcode updates for Windows 10 v1803 - August 21 - Windows 10 Forums
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  10. Cliff S's Avatar
    Posts : 21,212
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
       4 Weeks Ago #149

    Kinda of dumb(redundant) to have something running in memory the whole time, when BIOS already is taking care of it.

    I have enough memory, but, others sure don't.
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