How a Cloud Flaw Gave Chinese Spies a Key to Microsoft’s Kingdom

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How a Cloud Flaw Gave Chinese Spies a Key to Microsoft’s Kingdom
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Late Tuesday evening Microsoft revealed that a China-based hacker group stole a cryptographic key that allowed it to access the cloud-based email systems of 25 organizations, including the State Department. Here's how the unique hack took place.

But exactly how such a sensitive key, allowing such broad access, could be stolen in the first place remains unknown. WIRED contacted Microsoft, but the company declined to comment further.

But that theory doesn’t explain why an on-premise server for a Microsoft service inside an enterprise network would be using a key that Microsoft describes as intended for signing consumer account tokens. It also doesn’t explain why so many organizations, including US government agencies, would all be sharing one Outlook cloud instance.

If the hackers did in fact steal a signing key that could be used to forge tokens broadly across consumer accounts—and, thanks to Microsoft’s token validation issue, on enterprise accounts, too—the number of victims could be far greater than 25 organizations Microsoft has publicly accounted for, warns Williams.

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