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[Robert Ancell <robert.ancell@xxxxxxxxxxxxx>]

** Changed in: lightdm
       Status: Triaged => Fix Committed

** Changed in: lightdm
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1677924

Title:
  Local privilege escalation via guest user login

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.18 series:
  Fix Released
Status in Light Display Manager 1.20 series:
  Fix Released
Status in Light Display Manager 1.22 series:
  Fix Released
Status in lightdm package in Ubuntu:
  Triaged
Status in lightdm source package in Xenial:
  Fix Released
Status in lightdm source package in Yakkety:
  Fix Released
Status in lightdm source package in Zesty:
  Triaged

Bug description:
  It was discovered that a local attacker could watch for lightdm's
  guest-account script to create a /tmp/guest-XXXXXX file and then quickly create
  the lowercase representation of the guest user's home directory before lightdm
  could. This allowed the attacker to have control of the guest user's home
  directory and, subsequently, gain control of an arbitrary directory in the
  filesystem which could lead to privilege escalation.

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