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The Windows firewall is the overlooked defense against WannaCry and Adylkuzz


Despite all the attention currently focused on Windows computers being infected with WannaCry ransomware, a defensive strategy has been overlooked. This being a Defensive Computing blog, I feel the need to point it out.

The story being told everywhere else is simplistic and incomplete. Basically, the story is that Windows computers without the appropriate bug fix are getting infected over the network by WannaCry ransomware and the Adylkuzzcryptocurrency miner.

We are accustomed to this story. Bugs in software need patches. WannaCry exploits a bug in Windows, so we need to install the patch. For a couple days, I too, ascribed to this knee-jerk theme. But there is a gap in this simplistic take on the issue. Let me explain.

The bug has to do with input data being processed incorrectly.

If a Windows computer, that supports version 1 of the Server Message Block (SMB) file sharing protocol, is listening on the network, bad guys can send it specially crafted malicious data packets...(continued)

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