CVE-2017-12176

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 extra length validation in ProcEstablishConnection function allowing malicious X client to cause X server to crash or possibly execute arbitrary code.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
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-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
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	17.04 zesty	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
xorg-hwe-16.04	17.04 zesty	Not in release
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release

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=b74

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