A Software Properties security update has been released for Ubuntu Linux 14.04 ESM.

USN-4457-2: Software Properties vulnerability

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Ubuntu Security Notice USN-4457-2
August 17, 2020

software-properties vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM

Summary:

Software Properties could be made to manipulate the display.

Software Description:
- software-properties: manage the repositories that you install software from

Details:

USN-4457-1 fixed a vulnerability in Software. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory details:

Jason A. Donenfeld discovered that Software Properties incorrectly filtered
certain escape sequences when displaying PPA descriptions. If a user were
tricked into adding an arbitrary PPA, a remote attacker could possibly
manipulate the screen.

Update instructions:

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

Ubuntu 14.04 ESM:
python-software-properties 0.92.37.8ubuntu0.1~esm1
python3-software-properties 0.92.37.8ubuntu0.1~esm1
software-properties-common 0.92.37.8ubuntu0.1~esm1

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4457-2
  https://usn.ubuntu.com/4457-1
CVE-2020-15709