=========================================================================Ubuntu Security Notice USN-1475-1
June 15, 2012

apt update
=========================================================================
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:

APT now more thoroughly verifies imported keyrings.

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

Details:

Georgi Guninski discovered that APT relied on GnuPG argument order and did
not check GPG subkeys when validating imported keyrings via apt-key
net-update. While it appears that a man-in-the-middle attacker cannot
exploit this, as a hardening measure this update adjusts apt-key to
validate all subkeys when checking for key collisions.

Update instructions:

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

Ubuntu 12.04 LTS:
  apt                             0.8.16~exp12ubuntu10.1

Ubuntu 11.10:
  apt                             0.8.16~exp5ubuntu13.4

Ubuntu 11.04:
  apt                             0.8.13.2ubuntu4.5

Ubuntu 10.04 LTS:
  apt                             0.7.25.3ubuntu9.12

Ubuntu 8.04 LTS:
  apt                             0.7.9ubuntu17.5

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

References:
  https://ubuntu.com/security/notices/USN-1475-1
  https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1013128

Package Information:
  https://launchpad.net/ubuntu/+source/apt/0.8.16~exp12ubuntu10.1
  https://launchpad.net/ubuntu/+source/apt/0.8.16~exp5ubuntu13.4
  https://launchpad.net/ubuntu/+source/apt/0.8.13.2ubuntu4.5
  https://launchpad.net/ubuntu/+source/apt/0.7.25.3ubuntu9.12
  https://launchpad.net/ubuntu/+source/apt/0.7.9ubuntu17.5