Applications using Simple Streams could be made to crash or runprograms if it received specially crafted network traffic.

=========================================================================Ubuntu Security Notice USN-2746-1
September 24, 2015

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

- Ubuntu 15.04
- Ubuntu 14.04 LTS

Summary:

Applications using Simple Streams could be made to crash or run
programs if it received specially crafted network traffic.

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

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~bzr354-0ubuntu1.15.04.1
  python-simplestreams-openstack  0.1.0~bzr354-0ubuntu1.15.04.1
  python3-simplestreams           0.1.0~bzr354-0ubuntu1.15.04.1
  simplestreams                   0.1.0~bzr354-0ubuntu1.15.04.1

Ubuntu 14.04 LTS:
  python-simplestreams            0.1.0~bzr341-0ubuntu2.2
  python-simplestreams-openstack  0.1.0~bzr341-0ubuntu2.2
  python3-simplestreams           0.1.0~bzr341-0ubuntu2.2
  simplestreams                   0.1.0~bzr341-0ubuntu2.2

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:
  https://ubuntu.com/security/notices/USN-2746-1
  CVE-2015-1337

Package Information:
  https://launchpad.net/ubuntu/+source/simplestreams/0.1.0~bzr354-0ubuntu1.15.04.1
  https://launchpad.net/ubuntu/+source/simplestreams/0.1.0~bzr341-0ubuntu2.2