[sudo-users] "su" to any user BUT root + run any command without being prompted for password

Gonzalez, Aliep aliep.gonzalez at rbc.com
Fri May 4 14:22:30 EDT 2012

Hello All,

Environment: RHEL6, native version of the sudo binary

I am trying to allow a certain group of users to be able to "su" to any
user on the system but to root. I also want those users to be able to
run any command on the system without being prompted for password.

The below entries seem to take care of restricting the "su" command:

Cmnd_Alias     SUROOT = /bin/su - root, /bin/su -, /bin/su$, /usr/bin/su
- root, /usr/bin/su -, /usr/bin/su$
Cmnd_Alias     SUOTHERS = /bin/su - [a-zA-Z0-9]*, /bin/su [a-zA-Z0-9]*,
/usr/bin/su - [a-zA-Z0-9]*, /usr/bin/su [a-zA-Z0-9]*

However, once I add the "(ALL) NOPASSWD: ALL" directive to the group as
shown below (so they can run all commands on the system); users are
allowed to run "sudo su":


"sudo su -", and "sudo su - root" are still been (correctly) denied.

Is this a known issue or rather a configuration problem? Any pointers on
how to make this work will be greatly appreciated.

Thanks in advance,


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