=========================================================================Ubuntu Security Notice USN-1465-1
June 06, 2012

ubuntuone-client 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

Summary:

Fraudulent security certificates could allow sensitive information to
be exposed when accessing the Internet.

Software Description:
- ubuntuone-client: Ubuntu One client

Details:

It was discovered that the Ubuntu One Client incorrectly validated server
certificates when using HTTPS connections. If a remote attacker were able
to perform a man-in-the-middle attack, this flaw could be exploited to
alter or compromise confidential information.

Update instructions:

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

Ubuntu 12.04 LTS:
  python-ubuntuone-client         3.0.0-0ubuntu1.1

Ubuntu 11.10:
  python-ubuntuone-client         2.0.1-0ubuntu1.1

Ubuntu 11.04:
  python-ubuntuone-client         1.6.2-0ubuntu2.1

Ubuntu 10.04 LTS:
  python-ubuntuone-client         1.2.2-0ubuntu2.2

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

References:
  https://ubuntu.com/security/notices/USN-1465-1
  CVE-2011-4409

Package Information:
  https://launchpad.net/ubuntu/+source/ubuntuone-client/3.0.0-0ubuntu1.1
  https://launchpad.net/ubuntu/+source/ubuntuone-client/2.0.1-0ubuntu1.1
  https://launchpad.net/ubuntu/+source/ubuntuone-client/1.6.2-0ubuntu2.1
  https://launchpad.net/ubuntu/+source/ubuntuone-client/1.2.2-0ubuntu2.2