Of Phishing Attacks and WordPress 0days
April 24, 2015 12:17 AM
Proxying around 5% of the Internet’s requests gives us an interesting vantage point from which to observe malicious behavior. However, it also makes us a target. ...
Scaling out PostgreSQL for CloudFlare Analytics using CitusDB
April 09, 2015 5:32 PM
When I joined CloudFlare about 18 months ago, we had just started to build out our new Data Platform. At that point, the log processing and analytics pipeline built in the early days of the company had reached its limits. ...
Announcing Virtual DNS: DDoS Mitigation and Global Distribution for DNS Traffic
March 10, 2015 12:59 PM
It’s 9am and CloudFlare has already mitigated three billion malicious requests for our customers today. Six out of every one hundred requests we see are malicious, and increasingly, more of those bad requests are targeting DNS nameservers. ...
DDoS Packet Forensics: Take me to the hex!
January 06, 2015 11:10 PM
A few days ago, my colleague Marek sent an email about a DDoS attack against one of our DNS servers that we'd been blocking with our BPF rules....
How to ensure your server's software stays secure?
March 17, 2014 10:37 AM
At CloudFlare, security is on the top of our minds. We are always looking for ways to better secure the data we are entrusted with and improve the security of our customers' websites. ...
MORE POSTS
February 13, 2014 1:00 AM
Technical Details Behind a 400Gbps NTP Amplification DDoS Attack
On Monday we mitigated a large DDoS that targeted one of our customers. The attack peaked just shy of 400Gbps. We've seen a handful of other attacks at this scale, but this is the largest attack we've seen that uses NTP amplification....
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January 09, 2014 4:00 PM
Understanding and mitigating NTP-based DDoS attacks
Over the last couple of weeks you may have been hearing about a new tool in the DDoS arsenal: NTP-based attacks. These have become popular recently and caused trouble for some gaming web sites and service providers....
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October 03, 2013 11:00 AM
Patching a WHMCS zero day on day zero
A critical zero-day vulnerability was published today affecting any hosting provider using WHMCS. As part of building a safer web, CloudFlare has added a ruleset to our Web Application Firewall (WAF) to block the published attack vector....
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July 30, 2013 8:20 AM
DDoS Prevention: Protecting The Origin
One of the many great features that CloudFlare provides is protection from Distributed Denial of Service (DDoS) attacks. A malicious party who wants to make your website or web service unavailable could try to overwhelm it with requests from compromised machines (or bots) all aro...
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March 27, 2013 4:35 PM
The DDoS That Almost Broke the Internet
The New York Times this morning published a story about the Spamhaus DDoS attack and how CloudFlare helped mitigate it and keep the site online. The Times calls the attack the largest known DDoS attack ever on the Internet....
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March 20, 2013 6:26 PM
The DDoS That Knocked Spamhaus Offline (And How We Mitigated It)
At CloudFlare, we deal with large DDoS attacks every day. Usually, these attacks are directed at large companies or organizations that are reluctant to talk about their details. Sometimes a customer is willing to let us tell their story....
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March 03, 2013 1:47 PM
Today's Outage Post Mortem
This morning at 09:47 UTC CloudFlare effectively dropped off the Internet. The outage affected all of CloudFlare's services including DNS and any services that rely on our web proxy....
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February 22, 2013 9:12 PM
Good Web Security News: Open DNS Resolvers Are Getting Closed
This has been a rough week in the security industry with big attacks and compromises reported at companies from Facebook to Apple. ...
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December 21, 2012 3:41 AM
Hackers love the holidays
Looking at the latest DDoS attack statistics from CloudFlare's network, it seems that hackers love the holidays....
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October 30, 2012 7:54 AM
Deep Inside a DNS Amplification DDoS Attack
A few weeks ago I wrote about DNS Amplification Attacks. These attacks are some of the largest, as measured by the number of Gigabits per second (Gbps), that we see directed toward our network....
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September 17, 2012 8:17 PM
How to Launch a 65Gbps DDoS, and How to Stop One
Yesterday I posted a post mortem on an outage we had Saturday. The outage was caused when we applied an overly aggressive rate limit to traffic on our network while battling a determined DDoS attacker. ...
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August 28, 2012 5:44 PM
Turning "I'm Under Attack" into "I'm Doing Some Good"
CloudFlare's I'm Under Attack mode allows our customers to, at the click of a button, tell us that they are experiencing an attack and enable automatic protection. It works by slowing down visits to the web site that's under attack and performing extra work to identify malicious ...
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August 16, 2012 8:58 AM
Saturday Night Fever: Layer 7 attacks against CloudFlare sites
Recently, I've taken a look at DDoS attacks against CloudFlare sites at the IP level and the source of those attacks. The worst time for those DDoS attacks is the Wednesday Witching Hour and because of source IP address forgery most of the attacks seem to come from Mars. ...
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August 06, 2012 2:06 PM
Mars Attacks!
Following on from my recent post about when attacks hit CloudFlare, here's a follow up looking at where they come from. Or at least where they say they come from. Looking at attack statistics for the month of July 2012 the largest source of attacks is Mars....
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