Twitter hit by denial of service attack

[Osiris]

The popular social networking site Twitter has been hit by a denial of service attack, according to Twitter co-founder Biz Stone.
In an e-mail to CNN.com, Stone said this morning's attack is not related to a recent incident in which a hacker stole internal documents from the site.
"There's no indication that this attack is related to any previous activities. We are currently the target of a denial of service attack," Stone said in the e-mail.
"Attacks such as this are malicious efforts orchestrated to disrupt and make unavailable services such as online banks, credit card payment gateways, and in this case, Twitter for intended customers or users. We are defending against this attack now and will continue to update our status blog as we defend and later investigate."
Twitter's site went down around 9:30 a.m. ET on Thursday. A message posted on Twitter's status blog said the site was active again by 11:30 a.m., but that the site remained under attack.
"We are continuing to defend against and recover from this attack," the message says.
The site allows users to post 140-character messages, and many of Twitter's users have complained about feeling disconnected from the news of the day while the site is shut down.
In a blog post, Twitter says it will update the public with more information as it becomes available.
A denial of service attack essentially is an attempt to flood a Web site with so much information that it must shut down.

Twitter hit by denial of service attack - CNN.com

Twitter is Down, Twitter is Down!

Oh no! What are all those Twitterers going to do while the site is down? I'll keep this post to 140 characters or less so you'll feel at home until Twitter is back up.

Twitter was inaccessible for at least a half hour on Thursday morning, followed by a period of slowness and sporadic timeouts (and more outright downtime). It's not clear what has caused this. My theory is that it was the millions of people tweeting complaints about why it can't be Friday yet.
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[Osiris]

Researcher: Twitter attack targeted anti-Russian blogger

As Twitter struggled to return to normal Wednesday evening, a trickle of details suggested that the outage that left 30 million users unable to use the micro-blogging service for several hours - at least in part - may have been the result of a spam campaign that targeted a single user who vocally supports the Republic of Georgia.
According to Bill Woodcock, research director at the non-profit Packet Clearing House, the torrent of traffic that brought the site to its knees wasn't the result of a traditional DDoS, or distributed denial of service attack, but rather people who clicked on a link in spam messages that referenced a well-known blogger called Cyxymu.

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As spam goes, the emails looked benign enough. One of them carried the subject "Visit my blog" and contained the words "thanks for looking at my blog" in the body. They contained respective links to Cyxymu's accounts on Twitter, Facebook, LiveJournal and YouTube, all of which also reported receiving abnormal amounts of traffic on Thursday.

"This was not like a botnet-style DDoS," Woodcock told The Register. "This was a joejob where people were just clicking on links in email and the people clicking on the links were not malefactors. They were just the sort of idiots that click on links in email without knowing what they are."
Joejobs are spam messages that are designed not to push Viagra but to induce someone to click on a link in the hopes of harming the site being linked to.
Twitter has so far said little on its blog and status page except that it spent much of the day fighting against a denial of service attack and that as late as 4:45 pm California time, latency problems were still causing some users to receive error pages. Company representatives didn't respond to emails seeking comment.
The theory was backed by this article from CNET News, which quoted Facebook's chief security officer saying the attacks targeting multiple websites all contained traffic linking to accounts held by Cyxymu.
"It was a simultaneous attack across a number of properties targeting him to keep his voice from being heard," Facebook's Max Kelly told reporter Elinor Mills. "We're actively investigating the source of the attacks and we hope to be able to find out the individuals involved in the back end and to take action against them if we can."
Kelly made no reference to spam messages, so it remained unclear if the emails were the only cause of the mass requests to Cyxymu's profiles or if there were other causes as well.
Cyxymu has long been viewed as an antagonist by some Russian supporters, who take issue with the blogger's coverage of recent military conflicts in Georgia.

Researcher: Twitter attack targeted anti-Russian blogger ? The Register