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USN-4488-2: X.Org X Server vulnerabilities

9 September 2020

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

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Details

USN-4488-1 fixed several vulnerabilities in X.Org. This update provides
the corresponding update and also the update from USN-4490-1 for Ubuntu 14.04 ESM.

Original advisory 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)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
XkbSetNames function. A local attacker could possibly use this issue to
escalate privileges. (CVE-2020-14345)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

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

Ubuntu 14.04

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

References

Related notices

  • USN-4490-1: xserver-xephyr-hwe-18.04, xmir-hwe-16.04, xorg-server-hwe-18.04, xorg-server-source-hwe-16.04, xwayland, xserver-xorg-core-udeb, xnest, xserver-xorg-dev, xdmx, xserver-xorg-legacy, xorg-server-hwe-16.04, xserver-xorg-legacy-hwe-16.04, xwayland-hwe-16.04, xwayland-hwe-18.04, xserver-xorg-legacy-hwe-18.04, xserver-xephyr, xserver-xorg-core-hwe-18.04, xserver-xorg-xmir, xdmx-tools, xorg-server-source-hwe-18.04, xvfb, xserver-xorg-dev-hwe-16.04, xserver-common, xorg-server, xserver-xephyr-hwe-16.04, xmir, xorg-server-source, xserver-xorg-core-hwe-16.04, xserver-xorg-core, xserver-xorg-dev-hwe-18.04
  • USN-4488-1: xserver-xephyr-hwe-18.04, xmir-hwe-16.04, xorg-server-hwe-18.04, xorg-server-source-hwe-16.04, xwayland, xserver-xorg-core-udeb, xnest, xserver-xorg-dev, xdmx, xserver-xorg-legacy, xorg-server-hwe-16.04, xserver-xorg-legacy-hwe-16.04, xwayland-hwe-16.04, xwayland-hwe-18.04, xserver-xorg-legacy-hwe-18.04, xserver-xephyr, xserver-xorg-core-hwe-18.04, xserver-xorg-xmir, xdmx-tools, xorg-server-source-hwe-18.04, xvfb, xserver-xorg-dev-hwe-16.04, xserver-common, xorg-server, xserver-xephyr-hwe-16.04, xmir, xorg-server-source, xserver-xorg-core-hwe-16.04, xserver-xorg-core, xserver-xorg-dev-hwe-18.04

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