Ubuntu Security Notice USN-1477-1
15th June, 2012
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
An attacker could trick APT into installing altered packages.
- apt - Advanced front-end for dpkg
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.
The problem can be corrected by updating your system to the following package version:
- 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
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.