Bug#420863: 'gksu cmd' run 'cmd' as root without being prompted to enter root password

[Feng Gao]

Package: gksu
Version: 2.0.0-1

Package: sudo
Version: 1.68p12-4

The 'Defaults env_reset' in /etc/sudoers causes gksu not able to connect to session manager. For example, when from menu, select 'Root Terminal', one can become root without being prompted to enter a password. In ~/.xsession-errors, there is an warning as follow,

(x-terminal-emulator:12938): GnomeUI-WARNING **: While connecting to session manager: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed.

If the 'Defaults env_reset' is removed from /etc/sudoers, then everyting is OK.

I am using Debian GNU/Linux 4.0 rev0 amd64 Binary just installed on a Dell 670n workstaion.