[USN-4668-2] python-apt regression

[Alex Murray]

==========================================================================
Ubuntu Security Notice USN-4668-2
December 10, 2020

python-apt regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10

Summary:

USN-4668-1 introduced a regression in python-apt.

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

Details:

USN-4668-1 fixed vulnerabilities in python-apt. That update caused a
regression by removing information describing the Ubuntu 20.10 release from
the Ubuntu templates.  This update fixes the problem by restoring this
information.

We apologize for the inconvenience.

Original advisory details:

 Kevin Backhouse discovered that python-apt incorrectly handled 
 resources. A
 local attacker could possibly use this issue to cause python-apt to 
 consume
 resources, leading to a denial of service.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
  python3-apt                     2.1.3ubuntu1.2

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

References:
  https://usn.ubuntu.com/4668-2
  https://usn.ubuntu.com/4668-1
  https://launchpad.net/bugs/1907496

Package Information:
  https://launchpad.net/ubuntu/+source/python-apt/2.1.3ubuntu1.2
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