*** This bug is a security vulnerability ***
Public security bug reported:
When I log out (or reboot) then during the login screen I can see a
disturbed version of the contents of whoever most recently logged out of
my system. This lasts for a total of about 1 second but might be
regarded as a security concerns as it gives access to the screen of
another user. I think this should be a black screen instead.
relevant system information:
driver: nvidia-graphics-drivers-352-updates
desktop manager: gnome
operating system: Xenial
lsb_release -rd
Description: Ubuntu Xenial Xerus (development branch)
Release: 16.04
apt-cache policy
Package files:
100 /var/lib/dpkg/status
release a=now
500 http://ppa.launchpad.net/pipelight/stable/ubuntu xenial/main i386 Packages
release
v=16.04,o=LP-PPA-pipelight-stable,a=xenial,n=xenial,l=pipelight-stable,c=main,b=i386
origin ppa.launchpad.net
500 http://ppa.launchpad.net/pipelight/stable/ubuntu xenial/main amd64 Packages
release
v=16.04,o=LP-PPA-pipelight-stable,a=xenial,n=xenial,l=pipelight-stable,c=main,b=amd64
origin ppa.launchpad.net
500 http://archive.ubuntu.com/ubuntu xenial-proposed/main i386 Packages
release v=16.04,o=Ubuntu,a=xenial-proposed,n=xenial,l=Ubuntu,c=main,b=i386
origin archive.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages
release v=16.04,o=Ubuntu,a=xenial-proposed,n=xenial,l=Ubuntu,c=main,b=amd64
origin archive.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial-proposed/universe i386 Packages
release
v=16.04,o=Ubuntu,a=xenial-proposed,n=xenial,l=Ubuntu,c=universe,b=i386
origin archive.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial-proposed/universe amd64 Packages
release
v=16.04,o=Ubuntu,a=xenial-proposed,n=xenial,l=Ubuntu,c=universe,b=amd64
origin archive.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages
release v=16.04,o=Ubuntu,a=xenial-updates,n=xenial,l=Ubuntu,c=main,b=i386
origin archive.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
release v=16.04,o=Ubuntu,a=xenial-updates,n=xenial,l=Ubuntu,c=main,b=amd64
origin archive.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages
release
v=16.04,o=Ubuntu,a=xenial-updates,n=xenial,l=Ubuntu,c=universe,b=i386
origin archive.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
release
v=16.04,o=Ubuntu,a=xenial-updates,n=xenial,l=Ubuntu,c=universe,b=amd64
origin archive.ubuntu.com
500 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages
release v=16.04,o=Ubuntu,a=xenial-security,n=xenial,l=Ubuntu,c=main,b=i386
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
release v=16.04,o=Ubuntu,a=xenial-security,n=xenial,l=Ubuntu,c=main,b=amd64
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu xenial-security/universe i386 Packages
release
v=16.04,o=Ubuntu,a=xenial-security,n=xenial,l=Ubuntu,c=universe,b=i386
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
release
v=16.04,o=Ubuntu,a=xenial-security,n=xenial,l=Ubuntu,c=universe,b=amd64
origin security.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial/universe i386 Packages
release v=16.04,o=Ubuntu,a=xenial,n=xenial,l=Ubuntu,c=universe,b=i386
origin archive.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
release v=16.04,o=Ubuntu,a=xenial,n=xenial,l=Ubuntu,c=universe,b=amd64
origin archive.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages
release v=16.04,o=Ubuntu,a=xenial,n=xenial,l=Ubuntu,c=main,b=i386
origin archive.ubuntu.com
500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
release v=16.04,o=Ubuntu,a=xenial,n=xenial,l=Ubuntu,c=main,b=amd64
origin archive.ubuntu.com
Pinned packages:
** Affects: nvidia-graphics-drivers-352-updates (Ubuntu)
Importance: Undecided
Status: New
** Information type changed from Private Security to Public Security
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https://bugs.launchpad.net/bugs/1550801
Title:
Login screens shows data from last user session
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https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-352-updates/+bug/1550801/+subscriptions
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