An extremely serious vulnerability lay undiscovered at the heart of much of The Cloud for seven years. The vulnerability (CVE-2015-7835), which affects the Xen hypervisor software used by Cloud hosting companies like Amazon Web Services, is so serious that it was widely patched under embargo before being disclosed on 29 October 2015. It was discovered by 栾尚聪 (好风) of Alibaba and affects Xen software from...