Ubuntu Security Notices
USN-4488-1

USN-4488-1: X.Org X Server vulnerabilities

Publication date

2 September 2020

Overview

Several security issues were fixed in X.Org X Server.

Releases

20.04 LTS 18.04 LTS 16.04 LTS

Packages

xorg-server - X.Org X11 server
xorg-server-hwe-16.04 - X.Org X11 server
xorg-server-hwe-18.04 - X.Org X11 server

Details

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
input extension protocol. A local attacker could possibly use this issue to
escalate privileges. (CVE-2020-14346)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly initialized
memory. A local attacker could possibly use this issue to obtain sensitive
information. (CVE-2020-14347)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
XkbSelectEvents function. A local attacker could possibly use this issue to
escalate privileges. (CVE-2020-14361)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
XRecordRegisterClients function. A local attacker could possibly use this
issue to escalate privileges. (CVE-2020-14362)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
input extension protocol. A local attacker could possibly use this issue to
escalate privileges. (CVE-2020-14346)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly initialized
memory. A local attacker could possibly use this issue to obtain sensitive
information. (CVE-2020-14347)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
XkbSelectEvents function. A local attacker could possibly use this issue to
escalate privileges. (CVE-2020-14361)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
XRecordRegisterClients function. A local attacker could possibly use this
issue to escalate privileges. (CVE-2020-14362)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release	Package Version
20.04 focal	xserver-xorg-core – 2:1.20.8-2ubuntu2.3
18.04 bionic	xserver-xorg-core – 2:1.19.6-1ubuntu4.5
18.04 bionic	xserver-xorg-core-hwe-18.04 – 2:1.20.8-2ubuntu2.2~18.04.2
16.04 xenial	xserver-xorg-core – 2:1.18.4-0ubuntu0.9
16.04 xenial	xserver-xorg-core-hwe-16.04 – 2:1.19.6-1ubuntu4.1~16.04.3

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References

USN-4488-2

USN-4488-2