USN-2746-2: Simple Streams regression

25 September 2015

simplestreams regression

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

  • Ubuntu 15.04
  • Ubuntu 14.04 LTS


USN-2746-1 introduced a regression in Simple Streams.

Software Description

  • simplestreams - Library and tools for using Simple Streams data


USN-2746-1 fixed a vulnerability in Simple Streams. The update caused a regression preventing MAAS from downloading PXE images. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Simple Streams did not properly perform gpg verification in some situations. A remote attacker could use this to perform a man-in-the-middle attack and inject malicious content into the stream.

Update instructions

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

Ubuntu 15.04
python-simplestreams - 0.1.0~bzr354-0ubuntu1.15.04.2
python-simplestreams-openstack - 0.1.0~bzr354-0ubuntu1.15.04.2
python3-simplestreams - 0.1.0~bzr354-0ubuntu1.15.04.2
simplestreams - 0.1.0~bzr354-0ubuntu1.15.04.2
Ubuntu 14.04 LTS
python-simplestreams - 0.1.0~bzr341-0ubuntu2.3
python-simplestreams-openstack - 0.1.0~bzr341-0ubuntu2.3
python3-simplestreams - 0.1.0~bzr341-0ubuntu2.3
simplestreams - 0.1.0~bzr341-0ubuntu2.3

To update your system, please follow these instructions:

After a standard system update you need to restart any services that make use of python-simplestreams or python3-simplestreams to make all the necessary changes.