Error install homebrew on macOS High Sierra 10.13 in terminal

Hi! My mac doesn’t allow to install homebrew.

When I put this on terminal:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

I finally get this message:

Need sudo access on macOS!
sudo: /etc/sudoers is world writable
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin

What can I do??

Thanks!

You changed permissions on some essential macOS files. You should find the file /etc/sudoers in finder and make sure the permissions look like this in “get info”.
Screenshot 2020-04-03 at 08.58.36

It works, great! Thanks so much!!

I’ve got the same error “Need sudo access on macOS!” while installing Homebrew on Catalina.
sudoers file permissions are as below. Could you please help!
Thanks!

I have got the same message!
and the privileges are the same as you show above!
please help!

It seems to say you have no access just above the table does this mean anything?
its the same for yours MoonlightGuest.