A python-apt security update has been released for Ubuntu 14.04 ESM.

USN-4668-4: python-apt vulnerability

=========================================================================
Ubuntu Security Notice USN-4668-4
January 11, 2021

python-apt vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM

Summary:

python-apt could be made to crash if it opened a specially crafted file.

Software Description:
- python-apt: Python interface to libapt-pkg

Details:

USN-4668-1 fixed a vulnerability in python-apt. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory details:

Kevin Backhouse discovered that python-apt incorrectly handled resources. A
local attacker could possibly use this issue to cause python-apt to consume
resources, leading to a denial of service.

Update instructions:

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

Ubuntu 14.04 ESM:
python-apt 0.9.3.5ubuntu3+esm4
python3-apt 0.9.3.5ubuntu3+esm4

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

References:
  https://usn.ubuntu.com/4668-4
  https://usn.ubuntu.com/4668-1
CVE-2020-27351