Attacks/Breaches

10/21/2016
11:15 AM
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DDoS Attack On DNS Provider Disrupts Okta, Twitter, Pinterest, Reddit, CNN, Others

Brief but widespread attack illuminated vulnerability of the Internet's Domain Name System (DNS) infrastructure.

[UPDATED 2:40pm ET to reflect another wave of DDoS attacks on Dyn]

A major distributed denial-of-service (DDoS) attack on Internet domain service provider Dyn in the early morning hours on the East Coast today disrupted major websites - including Okta, CNN, Pinterest, Reddit, and Twitter - and provided a grim reminder of the vulnerability of a key element of the Internet's infrastructure.

The Domain Name Service (DNS) basically translates website names into their actual Internet addresses so that when a browser visits a website, for example, the machine is able to find that site.

Dyn said the DDoS attack affected its Managed DNS customers on the East Coast, and service was restored at 9:20 am Eastern Time. The attack began around 7:10 am Eastern Time: "Starting at 11:10 UTC on October 21st-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," Dyn said in a post on its website.

The attacks left websites either inaccessible or with slow-loading pages for some users. Some customers of Okta, the cloud-based multifactor authentication provider, were unable to access servers secured with Okta authentication, including virtual private networks (VPNs). "Our DNS provider is experiencing an issue, preventing lookup of records for some subdomains. Our team is working diligently to fix this," Okta said via Twitter.

Dyn has not provided any details about the nature of the DDoS attack, nor who might be behind it. But speculation ran high, including questions about whether the attacks could be retribution for Dyn's own research about unsavory Internet abuse by some providers, as reported by KrebsOnSecurity.

Some security experts debated whether the attack was a "dry run" by Russian nation-state hackers for the US's election day, where concerns about attacks on news outlets reporting the results of the election could be disrupted via DDoS or other attacks. It wouldn't be unprecedented: self-proclaimed Russian loyalists waged DDoS attacks on NATO and Ukrainian media websites in March of 2014 after NATO's then-secretary general Anders Fogh Rasmussen announced that NATO would not recognize the results of the planned "so-called referendum in Ukraine's Autonomous Republic of Crimea."

KrebsOnSecurity pointed out that the DDoS on Dyn hit after a Dyn researcher presented at the North American Network Operators Group (NANOG) in Dallas on suspicious BGP (Border Gateway Protocol) hijacks and DDoS-for-hire operations. But researcher and blogger Brian Krebs stopped short of attributing today's attack to that presentation. "I have no data to indicate that the attack on Dyn is related to extortion, to Mirai or to any of the companies or individuals [Dyn's Doug] Madory referenced in his talk this week in Dallas," he wrote.

Dyn Managed DNS advanced service monitoring is currently experiencing issues. Customers may notice incorrect probe alerts on their advanced DNS services. Our engineers continue to monitor and investigate the issue. 
 
[UPDATE: At noon ET today, Dyn was hit with another DDoS attack. As of 2:23pm ET, the company said it was experiencing problems with its Dyn Managed DNS advanced service monitoring: "Customers may notice incorrect probe alerts on their advanced DNS services. Our engineers continue to monitor and investigate the issue."]

 

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Kelly Jackson Higgins is Executive Editor at DarkReading.com. She is an award-winning veteran technology and business journalist with more than two decades of experience in reporting and editing for various publications, including Network Computing, Secure Enterprise ... View Full Bio

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liboires
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liboires,
User Rank: Apprentice
11/17/2016 | 3:03:55 PM
Re: How to avoide DDOS?
who knows what could eventually happend

 

medicamentfrance.net/
amiee
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50%
amiee,
User Rank: Apprentice
10/25/2016 | 7:16:01 AM
How to avoide DDOS?
My site has been DDOS attacked by my competitor several times, is there any way we can avoide it?
Dr.T
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50%
Dr.T,
User Rank: Ninja
10/24/2016 | 6:20:59 PM
Re: Public DNS Performance
Nice site. Thanks for sharing. I wonder why google's average response time is higher. 
Dr.T
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50%
Dr.T,
User Rank: Ninja
10/24/2016 | 6:19:19 PM
Re: DDoS Attack still on East coast
"This is super frustrating ..."

Tell me about it. did we have to go through this or there as an alternative I wonder.

 
Dr.T
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50%
Dr.T,
User Rank: Ninja
10/24/2016 | 6:17:56 PM
Re: This DDOS attack is still going on
"how do i unblock"

I do not think you can.
Dr.T
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50%
Dr.T,
User Rank: Ninja
10/24/2016 | 6:17:01 PM
Re: This DDOS attack is still going on
 "brief attack"

If DDoS notign is brief, it would streach way longer. 
Dr.T
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50%
Dr.T,
User Rank: Ninja
10/24/2016 | 6:15:46 PM
Dyn?
 

I am surprised why Dyn plays a rutial role in here. Is this the only site these big companies using for a domain name service? It is not really difficult to define different service providers for your own businesses so if one is down alternative will still be able to serve.
webxtrakt
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webxtrakt,
User Rank: Apprentice
10/22/2016 | 7:58:12 AM
Public DNS Performance
Follow Public DNS Performance updated hourly via https://webxtrakt.com/public-dns-performance
Lunastar1971*
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Lunastar1971*,
User Rank: Apprentice
10/21/2016 | 4:18:38 PM
DDoS Attack still on East coast
The DDoS Attack is still going on on the east coast. And it's 4:18 pm. This is super frustrating!
RuthR770
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50%
RuthR770,
User Rank: Apprentice
10/21/2016 | 3:59:35 PM
Re: This DDOS attack is still going on
It's 1 pm on the west coast and some sites are still down.
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