[USN-1762-1] APT vulnerability

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==========================================================================
Ubuntu Security Notice USN-1762-1
March 14, 2013

apt vulnerability
==========================================================================

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 11.10

Summary:

An attacker could trick APT into installing altered packages.

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

Details:

Ansgar Burchardt 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.

This update corrects the issue by disabling InRelease file support
completely.

Update instructions:

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

Ubuntu 12.10:
apt 0.9.7.5ubuntu5.4

Ubuntu 12.04 LTS:
apt 0.8.16~exp12ubuntu10.10

Ubuntu 11.10:
apt 0.8.16~exp5ubuntu13.7

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

References:
http://www.ubuntu.com/usn/usn-1762-1
CVE-2013-1051

Package Information:
https://launchpad.net/ubuntu/+source/apt/0.9.7.5ubuntu5.4
https://launchpad.net/ubuntu/+source/apt/0.8.16~exp12ubuntu10.10
https://launchpad.net/ubuntu/+source/apt/0.8.16~exp5ubuntu13.7