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Ubuntu Security Notice USN-1284-2

Ubuntu Security Notice USN-1284-2
Posted Feb 17, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1284-2 - USN-1284-1 fixed vulnerabilities in Update Manager. One of the fixes introduced a regression for Kubuntu users attempting to upgrade to a newer Ubuntu release. This update fixes the problem. David Black discovered that Update Manager incorrectly extracted the downloaded upgrade tarball before verifying its GPG signature. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could potentially be used to replace arbitrary files. David Black discovered that Update Manager created a temporary directory in an insecure fashion. A local attacker could possibly use this flaw to read the XAUTHORITY file of the user performing the upgrade. This update also adds a hotfix to Update Notifier to handle cases where the upgrade is being performed from CD media. Various other issues were also addressed.

tags | advisory, remote, arbitrary, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2011-3152, CVE-2011-3154
SHA-256 | e9e11dd64ad1bff59728da381b259a743f19dbb3662e7ca724ff936e7d46991e

Ubuntu Security Notice USN-1284-2

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1284-2
February 16, 2012

update-manager regression
============================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

USN-1284-1 introduced a regression in Update Manager.

Software Description:
- update-manager: GNOME application that manages apt updates

Details:

USN-1284-1 fixed vulnerabilities in Update Manager. One of the fixes
introduced a regression for Kubuntu users attempting to upgrade to a newer
Ubuntu release. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

David Black discovered that Update Manager incorrectly extracted the
downloaded upgrade tarball before verifying its GPG signature. If a remote
attacker were able to perform a man-in-the-middle attack, this flaw could
potentially be used to replace arbitrary files. (CVE-2011-3152)

David Black discovered that Update Manager created a temporary directory
in an insecure fashion. A local attacker could possibly use this flaw to
read the XAUTHORITY file of the user performing the upgrade.
(CVE-2011-3154)

This update also adds a hotfix to Update Notifier to handle cases where the
upgrade is being performed from CD media.

Update instructions:

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

Ubuntu 11.10:
update-manager-core 1:0.152.25.8

Ubuntu 11.04:
update-manager-core 1:0.150.5.2

Ubuntu 10.10:
update-manager-core 1:0.142.23.2

Ubuntu 10.04 LTS:
update-manager-core 1:0.134.11.2

Ubuntu 8.04 LTS:
update-manager-core 1:0.87.33

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

References:
http://www.ubuntu.com/usn/usn-1284-2
http://www.ubuntu.com/usn/usn-1284-1
https://launchpad.net/bugs/933225

Package Information:
https://launchpad.net/ubuntu/+source/update-manager/1:0.152.25.8
https://launchpad.net/ubuntu/+source/update-manager/1:0.150.5.2
https://launchpad.net/ubuntu/+source/update-manager/1:0.142.23.2
https://launchpad.net/ubuntu/+source/update-manager/1:0.134.11.2
https://launchpad.net/ubuntu/+source/update-manager/1:0.87.33
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