USN-1475-1: APT update

Publication date

15 June 2012

Overview

APT now more thoroughly verifies imported keyrings.


Packages

  • 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 machine-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.

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 machine-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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
8.04 hardy apt –  0.7.9ubuntu17.5
12.04 precise apt –  0.8.16~exp12ubuntu10.1
11.10 oneiric apt –  0.8.16~exp5ubuntu13.4
11.04 natty apt –  0.8.13.2ubuntu4.5
10.04 lucid apt –  0.7.25.3ubuntu9.12

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