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

Ubuntu Security Notice USN-1464-1

6th 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 version:

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.