DynDNS is currently being DDoS’d

Web Security Alert

DNS provider DynDNS, also known as Dyn.com is currently being attacked using a very aggressive DDoS attack. If you use them for your website DNS you probably have experienced outages today.

You can get status updates from DynDNS themselves here and also on Twitter.

This attack affects any website or online service that uses Dyn.com for DNS resolution. So far this attack has affected:

  • Paypal
  • Netflix
  • Github
  • Twitter
  • Esty
  • Soundcloud
  • Spotify
  • Amazon
  • Heroku
  • Pagerduty
  • Shopify

And many other large well known brands.

This attack may affect your website shopping cart checkout if you use a service provider who has been affected by the attack. It may also affect other features or services you provide to customers that rely on being able to contact a site affected by the attack.

The attack appears to be an attack on Dyn’s infrastructure according to their technical updates. They are working continuously to mitigate the attack. You can watch BGP routes change as Dyn tries to mitigate the attack.

Last Friday the source code for the Mirai malware that infects a very large (greater than 1 million) Internet of Things botnet was released to the general public. According to Brian Krebbs this “virtually guarantees that the Internet will soon be flooded with attacks from many new botnets powered by insecure routers, IP cameras, digital video recorders and other easily hackable devices”. This large scale attack today may be related to the Mirai source code release.

DownDetector is showing many major brands are having trouble today. Click on a logo for connectivity details.

If you are affected by this attack, you should consider setting up another DNS provider as your secondary DNS or temporarily moving all DNS to another provider. This appears to be what Amazon has done to mitigate the attack. You will need to exactly duplicate your DNS configuration on the new provider before making it the authoritative DNS for your domain and this may take some time. The transfer may take up to 48 hours, by which time this may all be over.

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