USN-1352-1: Software Properties vulnerability

Ubuntu Security Notice USN-1352-1

31st 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

Summary

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

Software description

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

Details

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 version:

Ubuntu 11.10:
python-software-properties 0.81.13.3
Ubuntu 11.04:
python-software-properties 0.80.9.1
Ubuntu 10.10:
python-software-properties 0.76.7.1
Ubuntu 10.04 LTS:
python-software-properties 0.75.10.2

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2011-4407