USN-4247-2: python-apt regression

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

Source: USN-4247-2: python-apt regression

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