USN-4488-1: X.Org X Server vulnerabilities

02 September 2020

Several security issues were fixed in X.Org X Server.

Releases

Packages

  • xorg-server - X.Org X11 server
  • xorg-server-hwe-16.04 - X.Org X11 server
  • xorg-server-hwe-18.04 - X.Org X11 server

Details

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
input extension protocol. A local attacker could possibly use this issue to
escalate privileges. (CVE-2020-14346)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly initialized
memory. A local attacker could possibly use this issue to obtain sensitive
information. (CVE-2020-14347)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
XkbSelectEvents function. A local attacker could possibly use this issue to
escalate privileges. (CVE-2020-14361)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
XRecordRegisterClients function. A local attacker could possibly use this
issue to escalate privileges. (CVE-2020-14362)

Update instructions

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

Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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

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