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[Bug 1413790] Re: It's possible to bypasss lockscreen if user is in nopasswdlogin group.

 

This bug was fixed in the package unity - 7.3.1+15.04.20150126-0ubuntu1

---------------
unity (7.3.1+15.04.20150126-0ubuntu1) vivid; urgency=low

  [ Andrea Azzarone ]
  * Force icon size (new gtk requires it). (LP: #1404730)
  * Disable markup accel for VolumeLauncherIcon quicklist menu items.
    (LP: #1413411)
  * Make sure dragged icons are not rendered behind the dash. (LP:
    #1413773)
  * Make unity unlockable if user is in nopsswdlogin group. On super+l
    the screensaver is activated. (LP: #1413790)
 -- Ubuntu daily release <ps-jenkins@xxxxxxxxxxxxxxxxxxx>   Mon, 26 Jan 2015 22:42:26 +0000

** Changed in: unity (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1413790

Title:
  It's possible to bypasss lockscreen if user is in nopasswdlogin group.

Status in Unity:
  In Progress
Status in unity package in Ubuntu:
  Fix Released

Bug description:
  Lightdm should not emit logind "unlock" signal when the user is not
  prompted for a password. This can lead to a security issue:

  # Log-in (unity session).
  # Add the current user to nopasswdlogin group.
  # Lock the sessions.
  # Session indicator->Switch account...
  # "Login" in again.

  Expected behavior:
  The lockscreen is still active.

  Current behavior:
  The session in unlocked.

  We could workaround the issue directly in unity, but IMHO would be
  cleaner to avoid that lightdm is emitting the logind signal.

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