USN-3456-1: X.Org X server vulnerabilities

Ubuntu Security Notice USN-3456-1

17th October, 2017

xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities

A security issue affects these releases of Ubuntu and its
derivatives:

Ubuntu 17.04
Ubuntu 16.04 LTS
Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the X.Org X server.

Software description

xorg-server
– X.Org X11 server
xorg-server-hwe-16.04
– X.Org X11 server
xorg-server-lts-xenial
– X.Org X11 server

Details

It was discovered that the X.Org X server incorrectly handled certain
lengths. An attacker able to connect to an X server, either locally or
remotely, could use these issues to crash the server, or possibly execute
arbitrary code.

Update instructions

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

Ubuntu 17.04:: xserver-xorg-core

2:1.19.3-1ubuntu1.3
Ubuntu 16.04 LTS:: xserver-xorg-core

2:1.18.4-0ubuntu0.7; xserver-xorg-core-hwe-16.04

2:1.19.3-1ubuntu1~16.04.4
Ubuntu 14.04 LTS:: xserver-xorg-core

2:1.15.1-0ubuntu2.11; xserver-xorg-core-lts-xenial

2:1.18.3-1ubuntu2.3~trusty4

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

Source: USN-3456-1: X.Org X server vulnerabilities

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