Windows 10 has a new security flaw and is already being exploited in the wild. You can become infected with malware only by downloading a file, as File Explorer will automatically open the file and preview it. Windows 7 has the same problem.
Upgrade : This error has been fixed in Microsoft patches released on April 14, 2020. Run Windows Update to fix the problem on your computer.
What you need to know
Microsoft ad this security hole on March 23, 2020. Microsoft says it is «aware of limited targeted attacks» using flaws in the Adobe Type Manager library. «There are several ways in which an attacker could exploit the vulnerability, such as persuading a user to open a specially crafted document or view it in the Windows Preview panel,» according to Microsoft’s security recommendations.
The defect affects all versions of Windows in active use: Windows 10, Windows 8.1, Windows 8, Windows 7 and various versions of Windows Server. (Of course, if you use Windows 7 and don’t pay for it extensive security updates, you will not receive a security patch).
A Microsoft spokesman said TechCrunch that Microsoft is working on a fix and expects the next one to be available patch marti, ie on April 14, 2020.
Until then, Microsoft offers an alternative solution which will protect your computers from security breaches.
How to protect your computer
To resolve this issue, all you need to do is turn off the Preview and Details panels in File Explorer (or Windows Explorer in earlier versions of Windows). Windows will not automatically display previews of OTF font files that will protect you.
You could still be attacked if you open a malicious file. However, simply viewing the file in File Explorer will not be a risk.
To do this, open File Explorer and click the «View» tab at the top of the window.
Make sure the «Panel Preview» and «Details Panel» options in the Panels section are turned off. Click on them to turn them on and off.
Then click the «Options» icon on the right side of the ribbon bar. If a menu appears, click «Change folder and search options.»
Click the «View» tab. In the «Advanced settings» box, select the «Always show icons, never thumbnails» option.
Have finished. Click the «OK» button to save the changes. Close all open File Explorer windows (or restart your computer) to make sure the change takes effect.
In Windows 7, you will need to change the same options. These are in a slightly different place in Windows Explorer.
First, click Organize> Layout, and use the menu options to turn off the Details panel and the Preview panel.
Second, click Organize> Folder and look for options in Windows Explorer to open the options window. Enable the «Always show icons, never thumbnails» option in the same place.
This change will only be required until Microsoft releases a security update that fixes the issue. Once your business is successful, you can reactivate your previews. (However, in Windows 7 without security updates, you’ll probably want to leave it permanently disabled.)