USN-1352-1: Software Properties vulnerability

31 January 2012

software-properties vulnerability

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

  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS


Software Properties could be tricked into installing arbitrary PPA GPG keys.

Software Description

  • software-properties - manage the repositories that you install software from


David Black discovered that Software Properties incorrectly validated server certificates when performing secure connections to download PPA GPG key fingerprints. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could be exploited to install altered package repository GPG keys.

Update instructions

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

Ubuntu 11.10
python-software-properties -
Ubuntu 11.04
python-software-properties -
Ubuntu 10.10
python-software-properties -
Ubuntu 10.04 LTS
python-software-properties -

To update your system, please follow these instructions:

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