I am working on AWS EC2 machine. File permission of sudores file is,
-rwxrwxrwx 1 root root 902 Feb 5 12:22 sudoers
There are various question on this , but these not works. When i am trying to do,
sudo chmod 444 sudoers
This show error,
sudo: /etc/sudoers is world writable
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin
How to fix it ?
It's complicated and discussed here
https://aws.amazon.com/premiumsupport/knowledge-center/ec2-sudoers-syntax-errors-sudo/
Basically you detach the EBS volume from the EC2, mount it on another EC2, use root privs on that host to fix the file and then reattach it to the EC2