Ubuntu 4247-2: python-apt regression

    Date22 Jan 2020
    Posted ByLinuxSecurity Advisories
    USN-4247-1 introduced a regression in python-apt.
    Ubuntu Security Notice USN-4247-2
    January 22, 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
    In general, a standard system update will make all the necessary changes.
    Package Information:
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