Synopsis :

The remote Ubuntu host is missing one or more security-related patches.

Description :

It was discovered that Libav incorrectly handled certain malformed
media files. If a user were tricked into opening a crafted media file,
an attacker could cause a denial of service via application crash, or
possibly execute arbitrary code with the privileges of the user
invoking the program.

Solution :

Update the affected libavcodec53 and / or libavformat53 packages.

Risk factor :

High