=========================================================================Ubuntu Security Notice USN-1477-1
June 15, 2012

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

- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

An attacker could trick APT into installing altered packages.

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

Details:

Georgi Guninski discovered that APT did not properly validate imported
keyrings via apt-key net-update. USN-1475-1 added additional verification
for imported keyrings, but it was insufficient. 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 the net-update option completely. A future update will re-enable
the option with corrected verification.

Update instructions:

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

Ubuntu 12.04 LTS:
  apt                             0.8.16~exp12ubuntu10.2

Ubuntu 11.10:
  apt                             0.8.16~exp5ubuntu13.5

Ubuntu 11.04:
  apt                             0.8.13.2ubuntu4.6

Ubuntu 10.04 LTS:
  apt                             0.7.25.3ubuntu9.13

Ubuntu 8.04 LTS:
  apt                             0.7.9ubuntu17.6

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

References:
  https://ubuntu.com/security/notices/USN-1477-1
  CVE-2012-0954

Package Information:
  https://launchpad.net/ubuntu/+source/apt/0.8.16~exp12ubuntu10.2
  https://launchpad.net/ubuntu/+source/apt/0.8.16~exp5ubuntu13.5
  https://launchpad.net/ubuntu/+source/apt/0.8.13.2ubuntu4.6
  https://launchpad.net/ubuntu/+source/apt/0.7.25.3ubuntu9.13
  https://launchpad.net/ubuntu/+source/apt/0.7.9ubuntu17.6