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

Got into this issue on the server, when trying to install mysql-server. 
 [zahmed@ahmed-server ~]$ sudo yum install mysql-server
 sudo: effective uid is not 0, is sudo installed setuid root?
 [zahmed@ahmed-server ~]$ sudo su
 sudo: effective uid is not 0, is sudo installed setuid root?
Checking the permissions from the root login, looks messed up. 
 [root@ahmed-server home]# ls -l /usr/bin/sudo
 ---x--x--x. 1 root root 123832 Nov 22  2013 /usr/bin/sudo
Setting uid to sudo and proper permissions.
 [root@ahmed-server home]# chmod 4755 /usr/bin/sudo
Lets check the permissions now and take it for a spin. 
 [root@ahmed-server home]# ls -l /usr/bin/sudo
 -rwsr-xr-x. 1 root root 123832 Nov 22  2013 /usr/bin/sudo
 [root@ahmed-server home]# su zahmed
 [zahmed@ahmed-server home]$ sudo su
 [root@ahmed-server home]#
We are all set. Below are few bit setting options.
 #To add the setuid bit
 chmod 4755 /usr/bin/filename

 #To set the setgid bit
 chmod 2755 /usr/bin/filename

 #To set both the setuid bit and the setgid bit
 chmod 6755 /usr/bin/filename
​
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