This was fixed by this security update:
http://www.ubuntu.com/usn/usn-2184-1/
** Changed in: unity (Ubuntu Trusty)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1308850
Title:
Dash is visible on top of the lockscreen after screen monitor auto
locks
Status in Unity:
Fix Committed
Status in “unity” package in Ubuntu:
In Progress
Status in “unity” source package in Trusty:
Fix Released
Bug description:
[Impact]
This is 100% reproducible on my side with an updated 14.04
I have a laptop that after 3 minutes of inactivity shutdown the screen
and lock-it.
If I press the SUPER button to activate the dash and then I wait 3 minutes
for auto screen locking the screen become black.
After that when I move the mouse to go to lockscreen and unlock my session, I
see the dash on top of the lockscreen.
I can digit my password and unlock the laptop pressing enter but I cannot see
the username, box, dots etc
I think that the screenshot attached explain very whell what I'm writing.
I think that this is a security problem because as you can see from my
screenshot other people can see my personal data (file and folders)
without authorization.
[Test Case]
(1) Make sure the screen lock is enabled and has a reasonable timeout set.
(2) Use the Super button to activate the Dash.
(3) Wait for the screen lock timeout so the lockscreen / screensaver comes up.
(4) Move the mouse or press a shift key to display the lockscreen.
(5) The Dash should not appear on top of the lockscreen.
[Regression Potential]
None. The fix is to explicitly undisplay the dash when the screen is
locked.
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