USN-1385-1: APT vulnerability

6 March 2012

apt vulnerability

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

  • Ubuntu 11.10
  • Ubuntu 11.04


An attacker could trick APT into installing altered packages.

Software Description

  • apt - Advanced front-end for dpkg


Simon Ruderich discovered that APT incorrectly handled repositories that use InRelease files. The default Ubuntu repositories do not use InRelease files, so this issue only affected third-party repositories. 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 11.10
apt - 0.8.16~exp5ubuntu13.2
Ubuntu 11.04
apt -

To update your system, please follow these instructions:

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