CVE-2017-7358

Publication date 4 April 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

In LightDM through 1.22.0, a directory traversal issue in debian/guest-account.sh allows local attackers to own arbitrary directory path locations and escalate privileges to root when the guest user logs out.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
lightdm	16.10 yakkety	Fixed 1.19.5-0ubuntu1.1
	16.04 LTS xenial	Fixed 1.18.3-0ubuntu1.1
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not affected

Notes

tyhicks

This issue was reported to us by Beyond Security but they did not discover the issue. The discoverer is unknown.

Severity score breakdown

Parameter	Value
Base score	7.3 · High
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H