USN-3362-1: X.Org X server vulnerabilities
Ubuntu Security Notice USN-3362-1
24th July, 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 endianness
conversion of certain X events. 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 as an administrator. (CVE-2017-10971)
It was discovered that the X.Org X server incorrectly handled endianness
conversion of certain X events. An attacker able to connect to an X server,
either locally or remotely, could use this issue to possibly obtain
sensitive information. (CVE-2017-10972)
Eric Sesterhenn discovered that the X.Org X server incorrectly compared
MIT cookies. An attacker could possibly use this issue to perform a timing
attack and recover the MIT cookie. (CVE-2017-2624)
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 17.04:
-
xserver-xorg-core
2:1.19.3-1ubuntu1.1
- Ubuntu 16.04 LTS:
-
xserver-xorg-core
2:1.18.4-0ubuntu0.3
-
xserver-xorg-core-hwe-16.04
2:1.18.4-1ubuntu6.1~16.04.2
- Ubuntu 14.04 LTS:
-
xserver-xorg-core
2:1.15.1-0ubuntu2.9
-
xserver-xorg-core-lts-xenial
2:1.18.3-1ubuntu2.3~trusty2
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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