=========================================================================Ubuntu Security Notice USN-3156-2
December 17, 2016

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

- Ubuntu 16.10

Summary:

USN-3156-1 introduced a regression in unattended-upgrades that may require
manual intervention to repair.

Software Description:
- apt: Advanced front-end for dpkg

Details:

USN-3156-1 fixed vulnerabilities in APT. It also caused a bug in
unattended-upgrades on that may require manual intervention to repair.

Users on Ubuntu 16.10 should run the following commands at a
terminal:

sudo dpkg --configure --pending
sudo apt-get -f install

This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 Jann Horn discovered that APT incorrectly handled InRelease files.
 If a remote attacker were able to perform a man-in-the-middle attack,
 this flaw could potentially be used to install altered packages.

Update instructions:

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

Ubuntu 16.10:
  apt                             1.3.3

After a standard system update you should run the following commands
to make all the necessary changes:
sudo dpkg --configure --pending
sudo apt-get -f install

References:
  https://ubuntu.com/security/notices/USN-3156-2
  https://ubuntu.com/security/notices/USN-3156-1
  https://launchpad.net/bugs/1649959

Package Information:
  https://launchpad.net/ubuntu/+source/apt/1.3.3