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 <[email protected]> Mon, 19 Jun 2017
16:32:24 +1200
** Changed in: lightdm (Ubuntu Artful)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1663157
Title:
Guest session processes are not confined in 16.10 and newer releases
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