GitHub was hit by distributed denial-of-service (DDoS) attacks that sent large volumes of Web traffic to the site, particularly towards two Chinese anti-censorship projects hosted there.
A tweet from the GitHub Status account said “Eighty-seven hours in, our mitigation is deflecting most attack traffic. We’re aware of intermittent issues and continue to adapt our response,”
The attack took the form of a flood of traffic, known as a distributed denial of service, or DDoS, attack. Those kinds of attacks are among the most common on the internet.
The Wall Street Journal reported that the flood of Internet traffic to GitHub came from Chinese search engine Baidu Inc, targeting two GitHub pages that linked to copies of sites that are banned in China.
On its blog, GitHub said that the attack began early on March 26 “and involves a wide combination of attack vectors.”
“These include every vector we’ve seen in previous attacks as well as some sophisticated new techniques that use the web browsers of unsuspecting, uninvolved people to flood github.com with high levels of traffic,” the blog post continued.
“Based on reports we’ve received, we believe the intent of this attack is to convince us to remove a specific class of content.”
GitHub supplies social coding tools for developers and calls itself the world’s largest code host.
A Beijing-based Baidu spokesman said the company had conducted a thorough investigation and found that it was neither a security problem on Baidu’s side nor a hacking attack.
“We have notified other security organizations and are working to get to the bottom of this,” the spokesman said.