[USN-2746-2] Simple Streams regression

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==========================================================================
Ubuntu Security Notice USN-2746-2
September 25, 2015

simplestreams regression
==========================================================================

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

- Ubuntu 15.04
- Ubuntu 14.04 LTS

Summary:

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

Software Description:
- simplestreams: Library and tools for using Simple Streams data

Details:

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

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.

References:
http://www.ubuntu.com/usn/usn-2746-2
http://www.ubuntu.com/usn/usn-2746-1
https://launchpad.net/bugs/1499749

Package Information:
https://launchpad.net/ubuntu/+source/simplestreams/0.1.0~bzr354-0ubuntu1.15.04.2
https://launchpad.net/ubuntu/+source/simplestreams/0.1.0~bzr341-0ubuntu2.3