Question: How to correct /etc/sudoers file permission (e.g. of issue found).
$ sudo syscheck sudo: /etc/sudoers is world writable sudo: no valid sudoers sources found, quitting sudo: unable to initialize policy plugin
You may encounters error as shown above if the sudoers file permissions are incorrect. Follow the steps below to correct the permissions.
1. Verify that sudoers file permission is correct:
# ls -l /etc/sudoers
2. The expected output:
-r--r-----. 1 root root 3822 Sep 12 08:53 /etc/sudoers
3. Changed the file permission if needed as root:
# chmod 440 /etc/sudoers
4. If step 2 is performed, verify the change that was made:
# ls -l /etc/sudoers