CVE-2017-12186

Publication date 12 October 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

xorg-x11-server before 1.19.5 was missing length validation in X-Resource extension allowing malicious X client to cause X server to crash or possibly execute arbitrary code.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
xorg	17.04 zesty	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
xorg-server	17.04 zesty	Fixed 2:1.19.3-1ubuntu1.3
	16.04 LTS xenial	Fixed 2:1.18.4-0ubuntu0.7
	14.04 LTS trusty	Fixed 2:1.15.1-0ubuntu2.11
xorg-server-hwe-16.04	17.04 zesty	Not in release
	16.04 LTS xenial	Fixed 2:1.19.3-1ubuntu1~16.04.4
	14.04 LTS trusty	Not in release
xorg-server-lts-xenial	17.04 zesty	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Fixed 2:1.18.3-1ubuntu2.3~trusty4
xorg-hwe-16.04	17.04 zesty	Not in release
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
xorg-server-lts-utopic	17.04 zesty	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
xorg-server-lts-vivid	17.04 zesty	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
xorg-server-lts-wily	17.04 zesty	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Notes

mdeslaur

same commit as CVE-2017-12184

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: ?id=cad

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3456-1
X.Org X server vulnerabilities
17 October 2017