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Ubuntu Security Notice USN-1477-1

Ubuntu Security Notice USN-1477-1
Posted Jun 16, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1477-1 - 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.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2012-0954
MD5 | a872f452ada6e25e1e3bae2203a0fea5

Ubuntu Security Notice USN-1477-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1477-1
June 15, 2012

apt vulnerability
============================================================================

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

Summary:

An attacker could trick APT into installing altered packages.

Software Description:
- apt: Advanced front-end for dpkg

Details:

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.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

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

In general, a standard system update will make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1477-1
CVE-2012-0954

Package Information:
https://launchpad.net/ubuntu/+source/apt/0.8.16~exp12ubuntu10.2
https://launchpad.net/ubuntu/+source/apt/0.8.16~exp5ubuntu13.5
https://launchpad.net/ubuntu/+source/apt/0.8.13.2ubuntu4.6
https://launchpad.net/ubuntu/+source/apt/0.7.25.3ubuntu9.13
https://launchpad.net/ubuntu/+source/apt/0.7.9ubuntu17.6

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