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

Releases

• Ubuntu 17.04
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

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

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

• xserver-xorg-core - 2:1.19.3-1ubuntu1.1

Ubuntu 16.04

• 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

• xserver-xorg-core - 2:1.15.1-0ubuntu2.9
• xserver-xorg-core-lts-xenial - 2:1.18.3-1ubuntu2.3~trusty2

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

References

• CVE-2017-10971
• CVE-2017-10972
• CVE-2017-2624