A weird Windows 10 drive corruption bug fixed — available for Windows Insider program.

Windows 10 Driver Bug

An unpatched zero-day in Microsoft Windows 10 allows attackers to corrupt an NTFS-formatted hard drive with a one-line command.

Jonas L drew attention to an NTFS vulnerability impacting Windows 10 that has not been fixed.

When exploited, this vulnerability can be triggered by a single-line command to instantly corrupt an NTFS-formatted hard drive, with Windows prompting the user to restart their computer to repair the corrupted disk records.

Last month, BleepingComputer reported on a new Windows bug that allows any users, including those with low privileges, to mark an NTFS volume as dirty.

To trigger the bug, Windows user need to type the special command -> cd C:\:$i30:$bitmap — as shown below,

After that, displays “The file of directory is corrupted and unreadable.”

Where then it marks the drive letter as corrupted and in need of repair.

However Windows prompts the user to reboot the computer and run chkdsk to fix the corruption.

Is This Serious?

According to Microsoft, although an error message saying “The file of directory is corrupted and unreadable”

And, when accessing the specific file or folder, the drive in fact not corrupted, and running the chkdsk tool would fix the issue. 

But according to BleepingComputers, in its tests the drive did become corrupted, and Windows 10 was unable to boot. Nasty stuff.

Though people wait for Microsoft to patch it, other organizations like Mozilla blocked in its update Firefox 85.0.1 from accessing the folder that causes the corruption.

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In a weekly update from Windows 10 Insider build 21322, when you attempt to access the path C:\:$i30:$bitmap Windows 10 will report “The directory name is invalid,” and no longer marks the NTFS volume as corrupted.

On the other hand only made available to Insiders on the Dev channel.

It is question whether Microsoft will be releasing a separate patch for earlier builds of the operating system or are you going to have to wait.