Ubuntu alert USN-4247-1 (python-apt)

From:
             
 
Marc Deslauriers <marc.deslauriers@canonical.com> 
To:
             
 
"ubuntu-security-announce@lists.ubuntu.com" <ubuntu-security-announce@lists.ubuntu.com> 
Subject:
             
 
[USN-4247-1] python-apt vulnerabilities 
Date:
             
 
Wed, 22 Jan 2020 14:55:18 -0500
Message-ID:
             
 
<c7bb59fa-80f0-293d-ae83-a20db4217e7a@canonical.com>
==========================================================================
Ubuntu Security Notice USN-4247-1
January 22, 2020

python-apt vulnerabilities
==========================================================================

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:

Several security issues were fixed in python-apt.

Software Description:
- python-apt: Python interface to libapt-pkg

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                      1.9.0ubuntu1.2
  python3-apt                     1.9.0ubuntu1.2

Ubuntu 19.04:
  python-apt                      1.8.5~ubuntu0.2
  python3-apt                     1.8.5~ubuntu0.2

Ubuntu 18.04 LTS:
  python-apt                      1.6.5ubuntu0.1
  python3-apt                     1.6.5ubuntu0.1

Ubuntu 16.04 LTS:
  python-apt                      1.1.0~beta1ubuntu0.16.04.7
  python3-apt                     1.1.0~beta1ubuntu0.16.04.7

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

References:
  https://usn.ubuntu.com/4247-1
  CVE-2019-15795, CVE-2019-15796

Package Information:
  https://launchpad.net/ubuntu/+source/python-apt/1.9.0ubun...
  https://launchpad.net/ubuntu/+source/python-apt/1.8.5~ubu...
  https://launchpad.net/ubuntu/+source/python-apt/1.6.5ubun...
  https://launchpad.net/ubuntu/+source/python-apt/1.1.0~bet...

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