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CVE-2017-8900

Publication date 11 May 2017

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.6 · Medium

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
lightdm 17.04 zesty
Fixed 1.22.0-0ubuntu2.1
16.10 yakkety
Fixed 1.19.5-0ubuntu1.2
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release

Notes

tyhicks

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

Severity score breakdown

Parameter Value
Base score 4.6 · Medium
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

Related Ubuntu Security Notices (USN)

Other references