USN-1475-1: APT update

Ubuntu Security Notice USN-1475-1

14th June, 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 version:

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

LP: 1013128