CVE-2018-14665

Description

A flaw was found in xorg-x11-server before 1.20.3. An incorrect permission check for -modulepath and -logfile options when starting Xorg. X server allows unprivileged users with the ability to log in to the system via physical console to escalate their privileges and run arbitrary code under root privileges.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
xorg-server-lts-wily	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
xorg	18.10 cosmic	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
xorg-hwe-16.04	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
xorg-server	18.10 cosmic	Fixed 2:1.20.1-3ubuntu2.1
	18.04 LTS bionic	Fixed 2:1.19.6-1ubuntu4.2
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
xorg-server-hwe-16.04	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Fixed 2:1.19.6-1ubuntu4.1~16.04.2
	14.04 LTS trusty	Not in release
xorg-server-lts-utopic	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
xorg-server-lts-vivid	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
xorg-server-lts-xenial	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Notes

mdeslaur

xorg server is actually the xorg-server package the xorg package only contains docs introduced by: https://gitlab.freedesktop.org/xorg/xserver/commit/032b1d79b7

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
xorg-server	Upstream: 50c0cf8

Severity score breakdown

Parameter	Value
Base score	6.6 · Medium
Attack vector	Physical
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3802-1
X.Org X server vulnerability
26 October 2018