A python-apt security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, and 20.10.

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Ubuntu Security Notice USN-4668-1
December 09, 2020

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

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:

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 20.10:
python3-apt 2.1.3ubuntu1.1

Ubuntu 20.04 LTS:
python-apt 2.0.0ubuntu0.20.04.2
python3-apt 2.0.0ubuntu0.20.04.2

Ubuntu 18.04 LTS:
python-apt 1.6.5ubuntu0.4
python3-apt 1.6.5ubuntu0.4

Ubuntu 16.04 LTS:
python-apt 1.1.0~beta1ubuntu0.16.04.10
python3-apt 1.1.0~beta1ubuntu0.16.04.10

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

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

Package Information:
  https://launchpad.net/ubuntu/+source/python-apt/2.1.3ubuntu1.1
  https://launchpad.net/ubuntu/+source/python-apt/2.0.0ubuntu0.20.04.2
  https://launchpad.net/ubuntu/+source/python-apt/1.6.5ubuntu0.4
  https://launchpad.net/ubuntu/+source/python-apt/1.1.0~beta1ubuntu0.16.04.10