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

Summary

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

Software Description

* python-apt - Python interface to libapt-pkg

Details

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:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

* USN-4247-1
* LP: 1860606

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