zero-day vulnerability in practically every version of Windows prior to Windows 8, a flaw in an old, obscure feature of Windows known as Server Message Block, or SMB. SMB allowed computers to share information, such as files and access to printers, directly from one to the next. And it contained multiple critical bugs that let anyone send SMB messages to a computer and gain full remote code execution on the target machine. With EternalBlue, the NSA’s hackers had coded that exploitation into a simple program capable of penetrating millions upon millions of computers around the world. Then
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