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Ubuntu Security Notice USN-1283-1

Ubuntu Security Notice USN-1283-1
Posted Nov 28, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1283-1 - 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. 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. 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. Various other issues were also addressed.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2011-3634
SHA-256 | 327413c22646f7456258bc2947fe0d8a48a8445340fd324511f04b9e940e42e2

Ubuntu Security Notice USN-1283-1

Change Mirror Download
==========================================================================
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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