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