USN-4199-2: libvpx vulnerabilities

USN-4199-2: libvpx vulnerabilities

USN-4199-1 fixed several vulnerabilities in libvpx. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that libvpx did not properly handle certain malformed
WebM media files. If an application using libvpx opened a specially crafted
WebM file, a remote attacker could cause a denial of service, or possibly
execute arbitrary code.
Source: USN-4199-2: libvpx vulnerabilities