This bug was fixed in the package lightdm - 1.22.0-0ubuntu2
---------------
lightdm (1.22.0-0ubuntu2) zesty; urgency=medium
* SECURITY UPDATE: Directory traversal allowing arbitrary directory
ownership and privilege escalation (LP: #1677924)
- debian/guest-account.sh: Detect existing malicious guest user home dirs
before proceeding with guest user creation
- CVE-2017-7358
-- Robert Ancell <[email protected]> Wed, 05 Apr 2017
10:34:32 +1200
** Changed in: lightdm (Ubuntu Zesty)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1677924
Title:
Local privilege escalation via guest user login
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