USN-1475-1: APT update
15 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 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
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.