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USN-4247-2: python-apt regression

22 January 2020

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




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
machine-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
Ubuntu 19.04
Ubuntu 18.04
Ubuntu 16.04

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