SUP itself does not handle the user+password. This is handled by the configured authentication entity that SUP is connected against.
You would need to connect SUP to the authentication provider of your choice (e.g. LDAP) as a data source. Your authentication provider would need to support the credential change via that interface (which they don't for security reasons I would guess). Then you would be faced with transporting the user credentials through SUP to the backend data source as regular data (have fun in the CDB), and also get your scenario approved by the corporate IT.
I would recommend to refocus to other features that are easier to implement.
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