12-16-2008
Unless your root, you need to know the password for the account you're su'ing to. If I know the account's password, I don't need to su, I can simply login to the account as a normal user. Can you change passwords so that the user does not have access to any accounts that are not his/hers?
Simply denying access to su will only stop a user from switching user accounts. It will not stop the user performing an interactive login into the specified account, which has the same end result.
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