[BUG] sudo can't be used after hardening the machine

[GauthierPLM]

Describe the bug
I receive the following error after running the hardening script on Ubuntu 24.04:

$ sudo reboot
sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set

To Reproduce

1. Setup a fresh ubuntu 24.04 machine.
2. Change SSH port to 12322 (or any other port)
3. use any as FW_ADMIN value.
4. run sudo bash ubuntu.sh
5. once completed, try to run a command using sudo (ex: sudo reboot). The command will be rejected with the error above

Expected behavior

The sudo command should work as expected.

System (lsb_release -a):

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 24.04.1 LTS
Release:	24.04
Codename:	noble

Additional context

/usr/bin$ ls -ln sudo
-rwxr-xr-x 1 0 0 335120 Apr  8  2024 sudo

[GauthierPLM]

Temporary solution:

• run the hardening as root and run chmod 4755 /usr/bin/sudo
• use a rescue mode to access the system and run the above command.

[konstruktoid]

Thank you @GauthierPLM for reporting this.
sudo was added by mistake in 70d66b2