USN-4247-2: python-apt regression

22 January 2020

python-apt regression

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 19.10
  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


USN-4247-1 introduced a regression in python-apt.

Software Description

  • python-apt - Python interface to libapt-pkg


USN-4247-1 fixed vulnerabilities in python-apt. The updated packages caused a regression when attempting to upgrade to a new Ubuntu release. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that python-apt would still use MD5 hashes to validate certain downloaded packages. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could potentially be used to install altered packages. (CVE-2019-15795)

It was discovered that python-apt could install packages from untrusted repositories, contrary to expectations. (CVE-2019-15796)

Update instructions

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

Ubuntu 19.10
python-apt - 1.9.0ubuntu1.3
python3-apt - 1.9.0ubuntu1.3
Ubuntu 19.04
python-apt - 1.8.5~ubuntu0.3
python3-apt - 1.8.5~ubuntu0.3
Ubuntu 18.04 LTS
python-apt - 1.6.5ubuntu0.2
python3-apt - 1.6.5ubuntu0.2
Ubuntu 16.04 LTS
python-apt - 1.1.0~beta1ubuntu0.16.04.8
python3-apt - 1.1.0~beta1ubuntu0.16.04.8

To update your system, please follow these instructions:

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