USN-2657-1: unattended-upgrades vulnerability

29 June 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


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

Software Description

  • unattended-upgrades - automatic installation of security upgrades


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

To update your system, please follow these instructions:

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