sudo: effective uid is not 0, is sudo installed setuid root?

[Mihai]

Error

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[user @ localhost ~]$ sudo su -
sudo: effective uid is not 0, is sudo installed setuid root?

Working command

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[user @ localhost ~]$ su -
Password:
[root @ localhost ~]$

Solution

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[user @ localhost ~]$ su
Password:
[root @ localhost ]$ chmod 4755 /usr/bin/sudo
[root @ localhost ]$ su user
[user @ localhost ~]$ sudo su -
[sudo] password for user:
[root @ localhost ~]# exit
logout