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CVE-2017-8900

Published: 11 May 2017

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.

Notes

AuthorNote
tyhicks 
This issue was introduced when the user session handling moved from
upstart to systemd in Ubuntu 16.10.

Priority

Medium

Cvss 3 Severity Score

4.6

Score breakdown

Status

Package Release Status
lightdm
Launchpad, Ubuntu, Debian 		trusty Does not exist
(trusty was not-affected)
upstream Needs triage

xenial Not vulnerable

yakkety
Released (1.19.5-0ubuntu1.2)
zesty
Released (1.22.0-0ubuntu2.1)

Severity score breakdown

Parameter Value
Base score 4.6
Attack vector Physical
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Bugs

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