==========================================================================
Ubuntu Security Notice USN-1283-1
November 28, 2011
apt vulnerability
==========================================================================
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
Summary:
APT could be made to expose sensitive information over the network.
Software Description:
- apt: Advanced front-end for dpkg
Details:
It was discovered that APT incorrectly handled the Verify-Host
configuration option. If a remote attacker were able to perform a
man-in-the-middle attack, this flaw could potentially be used to steal
repository credentials. This issue only affected Ubuntu 10.04 LTS and
10.10. (CVE-2011-3634)
USN-1215-1 fixed a vulnerability in APT by disabling the apt-key net-update
option. This update re-enables the option with corrected verification.
Original advisory details:
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.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 11.04:
apt 0.8.13.2ubuntu4.3
Ubuntu 10.10:
apt 0.8.3ubuntu7.3
Ubuntu 10.04 LTS:
apt 0.7.25.3ubuntu9.9
Ubuntu 8.04 LTS:
apt 0.7.9ubuntu17.4
In general, a standard system update will make all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1283-1
CVE-2011-3634
Package Information:
https://launchpad.net/ubuntu/+source/apt/0.8.13.2ubuntu4.3
https://launchpad.net/ubuntu/+source/apt/0.8.3ubuntu7.3
https://launchpad.net/ubuntu/+source/apt/0.7.25.3ubuntu9.9
https://launchpad.net/ubuntu/+source/apt/0.7.9ubuntu17.4
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