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A Massive DDoS Attack Against DYN DNS Service Affecting Twitter, Github, Many Others

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A massive cyberattack hindered access to many major websites across the internet on Friday. DNS provider Dyn has confirmed two massive distributed denial of service attacks against its servers Friday impacting many of its customers including Twitter, Spotify and GitHub. The attacks came in two waves, one early Friday morning and a second just a few hours later.

“This attack is mainly impacting U.S. East and is impacting Managed DNS customers in this region. Our engineers are continuing to work on mitigating this issue,” according to a statement by the companystatement by the company .

Domain name systems (DNS) are essentially the GPS of the internet, taking the text URLs you type into a browser and figuring out where those websites’ data is located on the back end. So when you type hackerbulletin.com in a browser, it shows you both the real hackerbulletin and can quickly and easily locate the nearest server that hosts the site’s data.

A DDoS attack overwhelms a DNS server with lookup requests, rendering it incapable of completing any. That’s what makes attacking DNS so effective; rather than targeting individual sites, an attacker can take out the entire Internet for any end user whose DNS requests route through a given server.

Manchester, New Hampshire-based Dyn said it first began monitoring the DDoS attack at 7:10 a.m. EDT Friday. The company said in a statement to customers:
“Starting at 11:10 UTC on October 21th-Friday 2016 we began monitoring and mitigating a DDoS attack against our Dyn Managed DNS infrastructure. Some customers may experience increased DNS query latency and delayed zone propagation during this time. Updates will be posted as information becomes available.”

Dyn said at 9:36 a.m. EDT, its services were restored and many of its affected customers, including Twitter, were back online. However, at 11:52 a.m. (EDT) Dyn updated its network status reporting an additional attack impacting its managed DNS infrastructure. Then 40 minutes later Dyn added the attacks had spread to its “managed DNS advanced services with possible delays in monitoring.” It’s unclear, at this time, the source of the DDoS attack, Dyn said.

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