Ubuntu Update for apt USN-1477-1

Ubuntu Update for Linux kernel vulnerabilities USN-1477-1
Please Install the Updated Packages.
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.
apt on Ubuntu 12.04 LTS , Ubuntu 11.10 , Ubuntu 11.04 , Ubuntu 10.04 LTS , Ubuntu 8.04 LTS