[USN-4488-2] X.Org X Server vulnerabilities

[Leonidas S. Barbosa]

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Ubuntu Security Notice USN-4488-2
September 09, 2020

xorg-server vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM

Summary:

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

Software Description:
- xorg-server: X.Org X11 server

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)

Update instructions:

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

Ubuntu 14.04 ESM:
  xserver-xorg-core               2:1.15.1-0ubuntu2.11+esm2

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

References:
  https://usn.ubuntu.com/4488-2
  https://usn.ubuntu.com/4488-1
  CVE-2020-14345, CVE-2020-14346, CVE-2020-14347, CVE-2020-14361,
  CVE-2020-14362
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