Jonas L on Twitter: "The way it works is: \\.\ or \\?\ or \??\ will start by looking in the callers local devicemap… "

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Nice find by @jonasLyk : cd <specialdir> Result: NTFS corruption Other vectors: - Open an ISO, VHD, or VHDX - Extract a ZIP file - Open an HTML file without a MoTW - Probably more...pic.twitter.com/LY18Lo3J3m

7 replies 37 retweets 93 likes

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Will Dormann‏ @wdormann Jan 9

This problem seems to be introduced around the time of Windows 10 1803. Prior versions of Windows do not appear to be affected. I'll give Microsoft a shot at addressing this before disclosing what the value of <specialdir> is. Though I question how such things get prioritized...

4 replies 5 retweets 35 likes

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Will Dormann‏ @wdormann Jan 9

Will Dormann Retweeted Will Dormann

Why? Almost 2 years ago I reported to them NTFS filesystems that can cause windows to BSOD when they're mounted. e.g. by double-clicking a VHD or VHDX file. That's still not fixed.https://twitter.com/wdormann/status/1095799927765127170 …

Will Dormann added,

Will Dormann @wdormann

Inspired by my earlier accidental discovery that a FreeNAS 11.2 ISO written to a USB drive with Rufus will cause Windows 7 to BSOD, I got to wondering how well modern operating systems handle malformed filesystems. Windows, Linux, macOS, FreeBSD all fail. https://www.youtube.com/watch?v=r3MeifE2oFw …

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Will Dormann‏ @wdormann Jan 16

And since the cat it is out of the bag: https://www.bleepingcomputer.com/news/security/windows-10-bug-corrupts-your-hard-drive-on-seeing-this-files-icon/ … It's probably worth mentioning that browsing the internet with old Edge browser could lead to NTFS corruption. It will happily allow a page on the internet to reference a local path. Don't use that Edge version.

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Will Dormann‏ @wdormann Jan 16

I've not seen another modern browser that allows a page that lives on the internet to be able to directly access a local file resource. But "classic" (non-Chromium) Edge? YOLO!pic.twitter.com/PvMz3PkakX

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Will Dormann‏ @wdormann Jan 16

Compare this vs. the Chromium-based Edge, or just about any other browser. A page on the internet can't just directly access a file on your local filesystem. Because this is dangerous.pic.twitter.com/5FWee5tqNd

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Will Dormann‏ @wdormann Jan 17

And while I haven't seen a variant that can trigger it directly from a (legacy) Edge browser on an internet page, it's worth mentioning that there's a vaguely-related (badness via accessing a path) BSOD bug released recently:https://www.bleepingcomputer.com/news/security/windows-10-bug-causes-a-bsod-crash-when-opening-a-certain-path/ …

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Will Dormann‏ @wdormann Jan 18

Specifically, I didn't see a way to get legacy Edge to obey the '.' in \\.\globalroot\device\condrv\kernelconnect However, as with the NTFS corruption bug, this can be triggered by something as innocuous as opening a file from a website. e.g., an ISO file:pic.twitter.com/AQL7Flfpk6

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Jonas L‏ @jonasLyk Jan 18

Replying to @wdormann

The way it works is: \\.\ or \\?\ or \??\ will start by looking in the callers local devicemappic.twitter.com/xBkouKg9wZ

8:26 AM - 18 Jan 2021

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1. Will Dormann‏ @wdormann Jan 18
  Replying to @jonasLyk
  
  Indeed. But Edge classic doesn't seem to obey any of those patterns in a link in my testing.
  Thanks. Twitter will use this to make your timeline better. Undo
  
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