** Branch linked: lp:lightdm/1.20 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1677924
Title: Local privilege escalation via guest user login Status in Light Display Manager: Fix Released Status in Light Display Manager 1.18 series: Fix Released Status in Light Display Manager 1.20 series: Fix Released Status in Light Display Manager 1.22 series: Fix Released Status in lightdm package in Ubuntu: Triaged Status in lightdm source package in Xenial: Fix Released Status in lightdm source package in Yakkety: Fix Released Status in lightdm source package in Zesty: Triaged Bug description: It was discovered that a local attacker could watch for lightdm's guest-account script to create a /tmp/guest-XXXXXX file and then quickly create the lowercase representation of the guest user's home directory before lightdm could. This allowed the attacker to have control of the guest user's home directory and, subsequently, gain control of an arbitrary directory in the filesystem which could lead to privilege escalation. To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm/+bug/1677924/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
