How to think about Microsoft's addition of the option to disable JavaScript in IE browsers

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As part of the October 2020 patch security update, Microsoft added a new option for Windows that allows system administrators to disable the JScript component in Internet Explorer.

The JScript scripting engine was originally included in Internet Explorer 3.0 in 1996 and is an old component of Microsoft's own ECMAScript standard (JavaScript language).

The development of the JScript engine is over, and the component was deprecated in Internet Explorer 8.0 in 2009, but the engine remains as an old component in IE in all Windows OS versions.

For years, threat participants realized that they could attack the JScript engine because Microsoft did not actively develop it and rarely released security updates, usually only when attacked by threat participants.

CVE-2018-8653, CVE-2019-1367, CVE-2019-1429, and CVE-2020-0674 are some of the most recent JScript zero-day jobs that Microsoft has had to deal with in the past three years.

All of these are errors exploited by state actors, and Microsoft must rush to release patches for this. Once docked, the proof of the concept code is also published on GitHub, and these vulnerabilities also quickly enter the arsenal using the development of kits.

Now, 11 years after abandoning the component, Microsoft finally provides system administrators with a way to disable JScript execution by default.

According to Microsoft, the October 2020 patch introduced new registry entries on Tuesday that system administrators can apply and prevent jscript.dll files from executing code.

For more information about how to do this, see the Microsoft documentation.

1. Click start, click run, type regedt32 or regedit, and then click OK.

two。 To disable JScript execution in the Internet area, locate the following registry subkey in the Registry Editor:

HKEY_LOCAL_MACHINE\ SOFTWARE\ Microsoft\ Windows\ CurrentVersion\ Internet Settings\ Zones\ 3\ 140D

To disable JScript execution in the restricted sites area, find the following registry subkey in the following location: registry Editor:

HKEY_LOCAL_MACHINE\ SOFTWARE\ Microsoft\ Windows\ CurrentVersion\ Internet Settings\ Zones\ 4\ 140D

3. Right-click the appropriate registry subkey, and then click modify.

4. In the Edit DWORD (32-bit) value dialog box, type 3.

5. Click OK, and then restart Internet Explorer.

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