Ubuntu Security Update USN-3453-1: X.Org X server vulnerabilities

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Ubuntu Security Notice USN-3453-1


12th 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


Michal Srb discovered that the X.Org X server incorrectly handled shared
memory segments. An attacker able to connect to an X server, either locally
or remotely, could use this issue to crash the server, or possibly replace
shared memory segments of other X clients in the same session.
(CVE-2017-13721)

Michal Srb discovered that the X.Org X server incorrectly handled XKB
buffers. An attacker able to connect to an X server, either locally or
remotely, could use this issue to crash the server, or possibly execute
arbitrary code. (CVE-2017-13723)

Update instructions


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

Ubuntu 17.04:
xserver-xorg-core 2:1.19.3-1ubuntu1.2
Ubuntu 16.04 LTS:
xserver-xorg-core 2:1.18.4-0ubuntu0.6
xserver-xorg-core-hwe-16.04 2:1.19.3-1ubuntu1~16.04.3
Ubuntu 14.04 LTS:
xserver-xorg-core 2:1.15.1-0ubuntu2.10
xserver-xorg-core-lts-xenial 2:1.18.3-1ubuntu2.3~trusty3

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


CVE-2017-13721, CVE-2017-13723

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