The following advisory describes a local privilege escalation via LightDM found in Ubuntu versions 16.10 / 16.04 LTS.
Ubuntu is an open source software platform that runs everywhere from IoT devices, the smartphone, the tablet and the PC to the server and the cloud. LightDM is an X display manager that aims to be lightweight, fast, extensible and multi-desktop. It uses various front-ends to draw login interfaces, also called Greeters.
An independent security researcher, G. Geshev (@munmap), has reported this vulnerability to Beyond Security’s SecuriTeam Secure Disclosure program
The vendor has released a patch to address this issue.
For more information: https://www.ubuntu.com/usn/usn-3255-1/