USN-3456-1: 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 certain
lengths. An attacker able to connect to an X server, either locally or
remotely, could use these issues to crash the server, or possibly execute
arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 17.04

• xserver-xorg-core - 2:1.19.3-1ubuntu1.3

Ubuntu 16.04

• xserver-xorg-core - 2:1.18.4-0ubuntu0.7
• xserver-xorg-core-hwe-16.04 - 2:1.19.3-1ubuntu1~16.04.4

Ubuntu 14.04

• xserver-xorg-core - 2:1.15.1-0ubuntu2.11
• xserver-xorg-core-lts-xenial - 2:1.18.3-1ubuntu2.3~trusty4

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

References

• CVE-2017-12176
• CVE-2017-12177
• CVE-2017-12178
• CVE-2017-12179
• CVE-2017-12180
• CVE-2017-12181
• CVE-2017-12182
• CVE-2017-12183
• CVE-2017-12184
• CVE-2017-12185
• CVE-2017-12186
• CVE-2017-12187