CVE-2017-13723

Publication date 9 October 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

In X.Org Server (aka xserver and xorg-server) before 1.19.4, a local attacker authenticated to the X server could overflow a global buffer, causing crashes of the X server or potentially other problems by injecting large or malformed XKB related atoms and accessing them via xkbcomp.

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-hwe-16.04	17.04 zesty	Not in release
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
xorg-server	17.04 zesty	Fixed 2:1.19.3-1ubuntu1.2
	16.04 LTS xenial	Fixed 2:1.18.4-0ubuntu0.6
	14.04 LTS trusty	Fixed 2:1.15.1-0ubuntu2.10
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-hwe-16.04	17.04 zesty	Not in release
	16.04 LTS xenial	Fixed 2:1.19.3-1ubuntu1~16.04.3
	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~trusty3

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=94f

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3453-1
X.Org X server vulnerabilities
12 October 2017