Run a script as root with SUID

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                          I created a simple script on Ubuntu Server 18.04:

    #!/bin/bash
    apt update
    apt upgrade

then I changed the owner to root

    # chown root update.sh

then I added SUID bit and execution bits for user and group

    # chmod u+xs,g+x update.sh

and this is what I have:

    -rwsrwxr-- 1 root  me  35 Mar 21 09:48 update.sh*

So I was expecting that by running this script which I have permission to run (it belongs to my group), it gets the root UID and it will execute as root, but I get permission denied.

Asked by Sasan (143 rep)

Mar 21, 2020, 10:34 AM
Last activity: Mar 21, 2020, 11:39 AM

Run a script as root with SUID

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