Attackers found a way to exploit tech that helps webpages load faster.
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    20•1 year ago

    This is the best summary I could come up with:

    Cloudflare, Google, Microsoft, and Amazon all say they successfully mitigated what two of the companies called the biggest DDoS layer 7 attacks they’ve recorded in August and September, though none said who the attacks were directed against.

    The companies say the attacks were possible because of a zero-day vulnerability in the HTTP/2 protocol they’ve named “HTTP/2 Rapid Reset.”

    HTTP/2 speeds up page loading by allowing for multiple simultaneous requests to a website over a single connection.

    Cloudflare writes that these attacks apparently involved an automated cycle of sending and immediately canceling “hundreds of thousands” of requests to websites that use HTTP/2, overwhelming servers and taking them offline.

    Google goes into detail in a blog post about how the attacks worked, so do head over there if you want to roll your sleeves up and read about it.

    Update October 10th, 2023, 1:20PM ET: Added that Microsoft has disclosed that its cloud infrastructure was affected as well.

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