Ubuntu Security Notice USN-1215-1
22nd September, 2011
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS
An attacker could trick APT into installing altered packages.
- apt - Advanced front-end for dpkg
It was discovered that the apt-key utility incorrectly verified GPG
keys when downloaded via the net-update option. 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 11.04:
- apt 0.8.13.2ubuntu4.2
- Ubuntu 10.10:
- apt 0.8.3ubuntu7.2
- Ubuntu 10.04 LTS:
- apt 0.7.25.3ubuntu9.7
- Ubuntu 8.04 LTS:
- apt 0.7.9ubuntu17.3
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.