CVE-2017-8900

Priority
Medium
Description
LightDM through 1.22.0, when systemd is used in Ubuntu 16.10 and 17.x,
allows physically proximate attackers to bypass intended AppArmor
restrictions and visit the home directories of arbitrary users by
establishing a guest session.
References
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8900
https://usn.ubuntu.com/usn/usn-3285-1
Bugs
https://launchpad.net/bugs/1663157
Notes
 tyhicks> This issue was introduced when the user session handling moved from
  upstart to systemd in Ubuntu 16.10.
Assigned-to
tyhicks
Package
Source: lightdm (LP Ubuntu Debian)
Upstream:needs-triage
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):not-affected
Ubuntu 16.04 LTS (Xenial Xerus):not-affected
Ubuntu 17.04 (Zesty Zapus):released (1.22.0-0ubuntu2.1)
Ubuntu 17.10 (Artful Aardvark):released (1.22.0-0ubuntu4)
More Information

Updated: 2017-12-15 20:36:00 UTC (commit 13913)