USN-1464-1: Ubuntu Single Sign On Client vulnerability

6 June 2012

ubuntu-sso-client vulnerability

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

  • Ubuntu 11.10
  • Ubuntu 11.04


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

Software Description

  • ubuntu-sso-client - Ubuntu Single Sign-On client


It was discovered that the Ubuntu Single Sign On 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 11.10
ubuntu-sso-client - 1.4.1-0ubuntu1.1
Ubuntu 11.04
ubuntu-sso-client - 1.2.1-0ubuntu2.1

To update your system, please follow these instructions:

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