Public bug reported:
Binary package hint: gnome-screensaver
By going to any of the ttys it is possible to terminate gnome-
screensaver and gain access to the machine. Although ttys themselves are
protected with passwords, these can be left unlocked accidentally, and
running "killall gnome-screensaver" we can get rid of the dialog and
gain full access to the computer.
What I suggest is:
A) Protect ttys after locking; also lock them with a password, or;
B) Protect the process so that it requires sudo privileges to kill, like
mysql/apache, or;
C) Make sure some parent process which can't be terminated can pop up the
gnome-screensaver when it is killed. Said process cannot be terminated, like
suggestion A.
I am typing this on my laptop which I just defeated using the
aforementioned technique.
** Affects: gnome-screensaver (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
Binary package hint: gnome-screensaver
By going to any of the ttys it is possible to terminate gnome-
screensaver and gain access to the machine. Although ttys themselves are
protected with passwords, these can be left unlocked accidentally, and
running "killall gnome-screensaver" we can get rid of the dialog and
gain full access to the computer.
What I suggest is:
A) Protect ttys after locking; also lock them with a password, or;
B) Protect the process so that it requires sudo privileges to kill, like
mysql/apache, or;
- C) Make sure some parent process which can't be terminated can pop up the
gnome-screensaver when called.
+ C) Make sure some parent process which can't be terminated can pop up the
gnome-screensaver when it is killed. Said process cannot be terminated, like
suggestion A.
I am typing this on my laptop which I just defeated using the
aforementioned technique.
--
Ability to kill gnome-screensaver makes it easy to defeat the lock screen dialog
https://bugs.launchpad.net/bugs/303637
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