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[Launchpad Bug Tracker <1413790@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unity - 7.2.4+14.04.20150316-0ubuntu1

---------------
unity (7.2.4+14.04.20150316-0ubuntu1) trusty; urgency=medium

  [ Andrea Azzarone ]
  * Avoid running potentially dangerous code paths when the screen is
    locked. (LP: #1410582)
  * Ungrab the shoutdown dialog as soon as possible. (LP: #1398287)
  * Use COMPIZ_METAKEY where needed. (LP: #1363534)
  * disabled Pointer Barriers during lockscreen (LP: #1401911)
  * disabled markup for VolumeLauncherIcon quicklist menu items (LP:
    #1413411)
  * enable Dash, Hud, and session dialogs over full screen window (LP:
    #1159249, #860970, #1413773, #1404486)
  * made unity unlockable if user is in nopsswdlogin group (LP:
    #1413790)
  * skipped the animation of BGHash on startup to prevent unwanted fade-
    in (LP: #1241757)

  [ Luke Yelavich ]
  * extended accessible exploration of the Dash dynamic content (LP:
    #1066157)

  [ Marco Trevisan (Treviño) ]
  * MenuManager: make sure menus are always shown when mouse is over
    them or when the always-show-menus option is on (LP: #955193,
    #1390562, #1374942, #1312137)
  * PanelService: use gdbus to notfy upstart of service start/stop (LP:
    #1302955)
 -- CI Train Bot <ci-train-bot@xxxxxxxxxxxxx>   Mon, 16 Mar 2015 17:30:35 +0000

** Changed in: unity (Ubuntu Trusty)
       Status: Fix Committed => 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:
  Fix Released
Status in Unity 7.2 series:
  In Progress
Status in unity package in Ubuntu:
  Fix Released
Status in unity source package in Trusty:
  Fix Released

Bug description:
  [IMPACT]
  A user is presented with a password dialog even if a member of the nopasswdlogin group (and may not have a password).

  [TEST CASE]

  (1) Create a test user.
  (2) Add the test user to the nopasswdlogin group.
  (3) Log in to a Unity session using that acocunt.
  (4) Lock the screen.
  (5) Attempt to unlock the screen:  no password prompt should be presented.

  [REGRESSION POTENTIAL]

  Conceivably allowing a login with no authentication could present
  unexpected vulnerabilities in which unforseen code paths also exercise
  this function.  Care has been taken by the developer to avoid such
  cases.

  [OTHER INFO]

  The fix for Ubuntu 14.04 LTS was cherry picked from the Ubuntu "Vivid
  Vervet" dev release where it has been in production use for some time
  without apparent regression.

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