Can't " su - "

Hello,
I got a problem with command " su- "
I have logged in as User then I " su - " to root, but I got permission denied. Because I have some wrong chown before Can't
Do you know what file is content command " su - " ? And where is it located ?
Now, I can't log in as root yet, because I have been disabled root log in and disable Telnet too . Do you now how can I chown the files content command " su - " again ?

I'm using RedHat9 and CPanel/WHM.

Thank you for your help !

 

 

 

 

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