*** This bug is a security vulnerability ***

Public security bug reported:

Binary package hint: gdm

I can see there has been some discussion about this already.

http://ubuntuforums.org/showthread.php?t=1263757&page=2   - for example

However, while on a home desktop computer it may be useful to have a
bling face browser login, on a mobile business laptop it most certainly
is highly preferable to _not_ display any information about the users
configured on a system.

The system should NOT revert from not displaying usernames to displaying
them, AND IT MUST BE POSSIBLE TO TURN OFF THIS FUNCTIONALITY, currently
it is not.

Displaying users may inadvertently divulge information about the source
of the laptop, and thus increase the desirability of the laptop. It may
also divulge information about login ids, which although retrievable by
dismantling the computer, is not something that, in general, unix has
chosen to display.

Looking back even to insecure programs like "telnet", they don't present
you with

Login (choose one of root, bobj, jim, admin1, system):

This is a regression, and should be classified as a security regression.

** Affects: gdm (Ubuntu)
     Importance: Undecided
         Status: New

** Visibility changed to: Public

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GDM Should not show users before requesting login
https://bugs.launchpad.net/bugs/465950
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