desktop-packages team mailing list archive

[Tyler Hicks <tyhicks@xxxxxxxxxxxxx>]

HI Nathan - Thanks for the bug report. I'm going to make it public so
that more people can be aware of this issue in hopes that it'll get
attention.

** Information type changed from Private Security to Public Security

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https://bugs.launchpad.net/bugs/1515662

Title:
  Major security issue with light-locker - console switching gives
  access to other screens for a few seconds

Status in light-locker package in Ubuntu:
  New
Status in lightdm package in Ubuntu:
  Invalid

Bug description:
  light-locker is completely insecure for X configurations with multiple
  screens that are not using a single display.

  My setup - 4 monitors, nvidia, each with separate screen.

  If I lock screen and then control-alt-f7 back to X, only one single
  screen is protected. After several seconds, it forces a switch to the
  lock display, but in the mean time, the other three screens are
  COMPLETELY UNPROTECTED.

  It only takes a few seconds to launch a terminal and killall light-
  locker and I have unrestricted access to all.

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