A python-apt regression update has been released for Ubuntu Linux 19.10, 19.04, 18.04 LTS, and 16.04 LTS.
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Ubuntu Security Notice USN-4247-2
January 22, 2020
python-apt regression
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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
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4247-2
https://usn.ubuntu.com/4247-1
https://launchpad.net/bugs/1860606
Package Information:
https://launchpad.net/ubuntu/+source/python-apt/1.9.0ubuntu1.3
https://launchpad.net/ubuntu/+source/python-apt/1.8.5~ubuntu0.3
https://launchpad.net/ubuntu/+source/python-apt/1.6.5ubuntu0.2
https://launchpad.net/ubuntu/+source/python-apt/1.1.0~beta1ubuntu0.16.04.8
