Accidentally change ownership of /etc/sudoer back to ec2-user

Question

Got this error when trying to change it back to root. What is the best way to fix it, best if there's no need to reboot server. 
Thanks in advanced for willing to assist on it!

Note: 
- root does not set with password, so unable to `su -`
- unable to install pkexec now as it require sudo

```
$sudo chown root:root /etc/sudo.conf
sudo: /etc/sudo.conf is owned by uid 1000, should be 0
sudo: /etc/sudo.conf is owned by uid 1000, should be 0
sudo: /etc/sudoers is owned by uid 1000, should be 0
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin
```

Uname
```
uname -a
Linux xxx.amzn2.x86_64 #1 SMP Fri Feb 4 17:12:04 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
```

Answer

From aws console > instance > connect 
user: change to "root" > connect

```sh
chown root:root /etc/sudo.conf
chown root:root /etc/sudoers
chown -R root:root /etc/sudoers.d
```

Now you should be able to run `sudo` command using `ec2-user` account

Answer

>From aws console > instance > connect user: change to "root" > connect

This ^ is inaccessible for me.

Alternative method:

https://aws.amazon.com/premiumsupport/knowledge-center/ec2-sudo-commands/ - I used the "Debian-based" script, but their commands are incomplete.

I simply added (to the bottom) the commands that @kenng provided, and that worked for those specific files & folders. However, in my case I also needed to add:

```
chown root:root /usr/libexec/sudo
chown -R root:root /usr/libexec/sudo/sudoers.so
```

Accidentally change ownership of /etc/sudoer back to ec2-user

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