=========================================================================Ubuntu Security Notice USN-2657-1
June 29, 2015

unattended-upgrades vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 15.04
- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

An attacker could trick unattended-upgrades into installing altered
packages.

Software Description:
- unattended-upgrades: automatic installation of security upgrades

Details:

It was discovered that unattended-upgrades incorrectly performed
authentication checks in certain configurations. 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 15.04:
  unattended-upgrades             0.83.6ubuntu1

Ubuntu 14.10:
  unattended-upgrades             0.82.8ubuntu0.3

Ubuntu 14.04 LTS:
  unattended-upgrades             0.82.1ubuntu2.3

Ubuntu 12.04 LTS:
  unattended-upgrades             0.76ubuntu1.1

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

References:
  https://ubuntu.com/security/notices/USN-2657-1
  CVE-2015-1330

Package Information:
  https://launchpad.net/ubuntu/+source/unattended-upgrades/0.83.6ubuntu1
  https://launchpad.net/ubuntu/+source/unattended-upgrades/0.82.8ubuntu0.3
  https://launchpad.net/ubuntu/+source/unattended-upgrades/0.82.1ubuntu2.3
  https://launchpad.net/ubuntu/+source/unattended-upgrades/0.76ubuntu1.1