libupnp - security update

Two vulnerabilities were discovered in libupnp, a portable SDK for
UPnP devices.

• CVE-2016-6255
  Matthew Garret discovered that libupnp by default allows any user to
  write to the filesystem of the host running a libupnp-based server
  application.
• CVE-2016-8863
  Scott Tenaglia discovered a heap buffer overflow vulnerability, that
  can lead to denial of service or remote code execution.

For the stable distribution (jessie), these problems have been fixed in
version 1:1.6.19+git20141001-1+deb8u1.

For the testing (stretch) and unstable (sid) distributions, these
problems have been fixed in version 1:1.6.19+git20160116-1.2.

We recommend that you upgrade your libupnp packages.