This bug was fixed in the package lightdm - 1.22.0-0ubuntu4

lightdm (1.22.0-0ubuntu4) artful; urgency=medium

  * SECURITY UPDATE: Guest session not confined (LP: #1663157)
    - debian/50-disable-guest.conf:
    - debian/lightdm.install:
      - Disable guest sessions by default, this can be overridden by custom
        configuration (e.g. /etc/lightdm/lightdm.conf)
    - CVE-2017-8900

 -- Robert Ancell <>  Mon, 19 Jun 2017
16:32:24 +1200

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

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  Guest session processes are not confined in 16.10 and newer releases

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