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Microsoft Loses Control Over Windows Tiles Subdomain (zdnet.com)
Microsoft has lost control over a crucial subdomain that Windows 8 and Windows 10 use to deliver RSS-based news and updates to Live Tiles -- animated Windows start menu items. From a report: The subdomain (notifications.buildmypinnedsite.com) is currently under the control of Hanno Bock, a security researcher and journalist for German tech news site Golem.de. The subdomain was part of the buildmypinnedsite.com service that Microsoft set up with the launch of Windows 8, and more specifically to allow websites to show live updates inside users' Start pages and menus.
[...] Today Bock said the service no longer works. "The host that should deliver the XML files -- notifications.buildmypinnedsite.com -- only showed an error message from Microsoft's cloud service Azure," the researcher said. "The host was redirected to a subdomain of Azure. However this subdomain wasn't registered with Azure." Bock registered this subdomain on his Azure account and is currently sinkholing any requests it receives. He also notified Microsoft of the issue but said the company did not reply. "We won't keep the host registered permanently. There's a decent amount of traffic reaching this host and running up costs," the researcher said. "Once we cancel the subdomain a bad actor could register it and abuse it for malicious attacks," he warned.
[...] Today Bock said the service no longer works. "The host that should deliver the XML files -- notifications.buildmypinnedsite.com -- only showed an error message from Microsoft's cloud service Azure," the researcher said. "The host was redirected to a subdomain of Azure. However this subdomain wasn't registered with Azure." Bock registered this subdomain on his Azure account and is currently sinkholing any requests it receives. He also notified Microsoft of the issue but said the company did not reply. "We won't keep the host registered permanently. There's a decent amount of traffic reaching this host and running up costs," the researcher said. "Once we cancel the subdomain a bad actor could register it and abuse it for malicious attacks," he warned.
No need to do anything with the DNS.
You can create an Azure or Amazon bucket with any name you want, such as frog.denver, hfjskfhd.fjshdjd.hdhdjhs, or secure.microsoft.com. These are NOT DNS names. They're just arbitrary strings.
In the DNS, Microsoft has the DNS name pointed to Azure.
Azure then has that name pointed to a bucket which just happens to have the same name. It could have any name. If Microsoft deletes the bucket (or other resource), anyone else can create one that happens to have the same name.