USN-3453-1: X.Org X server vulnerabilities

Packages

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)

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

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.

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

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References