=========================================================================Ubuntu Security Notice USN-1284-1
November 28, 2011

update-manager vulnerabilities
=========================================================================
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:

Update Manager could be made to overwrite files as the administrator.

Software Description:
- update-manager: GNOME application that manages apt updates
- update-notifier: Daemon which notifies about package updates

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                  1:0.152.25.5

Ubuntu 11.04:
  update-manager                  1:0.150.5.1
  update-notifier                 0.111ubuntu2.1

Ubuntu 10.10:
  update-manager                  1:0.142.23.1
  update-notifier                 0.105ubuntu1.1

Ubuntu 10.04 LTS:
  auto-upgrade-tester             1:0.134.11.1
  update-notifier                 0.99.3ubuntu0.1

Ubuntu 8.04 LTS:
  update-manager                  1:0.87.31.1

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

References:
  https://ubuntu.com/security/notices/USN-1284-1
  CVE-2011-3152, CVE-2011-3154

Package Information:
  https://launchpad.net/ubuntu/+source/update-manager/1:0.152.25.5
  https://launchpad.net/ubuntu/+source/update-manager/1:0.150.5.1
  https://launchpad.net/ubuntu/+source/update-notifier/0.111ubuntu2.1
  https://launchpad.net/ubuntu/+source/update-manager/1:0.142.23.1
  https://launchpad.net/ubuntu/+source/update-notifier/0.105ubuntu1.1
  https://launchpad.net/ubuntu/+source/update-manager/1:0.134.11.1
  https://launchpad.net/ubuntu/+source/update-notifier/0.99.3ubuntu0.1
  https://launchpad.net/ubuntu/+source/update-manager/1:0.87.31.1