USN-3362-1: X.Org X server vulnerabilities

24 July 2017

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

Releases

Packages

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 versions:

Ubuntu 17.04
Ubuntu 16.04
Ubuntu 14.04

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