February 05, 2015
CloudFlare is, arguably, the largest third-party DNS Authoritative operator in the world. We manage well over 1 million domains and have registrations in almost every TLD open for registrations....
January 29, 2015
Today is a big day for CloudFlare! We are publishing our first two DNSSEC signed zones for the community to analyze and give feedback on....
January 06, 2015
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....
October 14, 2014
If you are a CloudFlare Pro or above customer you enjoy the protection of the CloudFlare WAF. If you use one of the common web platforms, such as WordPress, Drupal, Plone, WHMCS, or Joomla, then it's worth checking if the relevant CloudFlare WAF ruleset is enabled....
September 30, 2014
On Wednesday of last week, details of the Shellshock bash bug emerged. This bug started a scramble to patch computers, servers, routers, firewalls, and other computing appliances using vulnerable versions of bash....
July 03, 2014
In a recent article I described the basic concepts behind the use of Berkeley Packet Filter (aka BSD Packet filter or BPF) bytecode for high performance packet filtering, and the xt_bpf iptables module....
July 02, 2014
In the past we've written about how CloudFlare isn't afraid to rip out and replace chunks of code that have proved to be hard to maintain or have simply reach end of life. ...
June 13, 2014
On the 10th of June, the UK domain registry Nominet made available second-level domain namespace to the public, allowing anyone to register a domain ending with simply .uk...
June 12, 2014
Earlier today, CloudFlare announced Project Galileo to protect free speech on the Web by using its sophisticated anti-DDoS resources. ...
June 05, 2014
The OpenSSL team announced seven vulnerabilities covering OpenSSL 0.9.8, 1.0.0, 1.0.1 and 1.0.2 (i.e. all versions) earlier today....
April 17, 2014
A quick followup to our last blog post on our decision to reissue and revoke all of CloudFlare's customers' SSL certificates. One question we've received is why we didn't just reissue and revoke all SSL certificates as soon as we got word about the Heartbleed vulnerability?...
April 12, 2014
As you may have noticed, the CloudFlare Heartbleed Challenge has been solved. The private key for the site cloudflarechallenge.com has been obtained by several authorized attackers via the Heartbleed exploit....
April 11, 2014
Earlier today we announced the Heartbleed Challenge. We set up a nginx server with a vulnerable version of OpenSSL and challenged the community to steal its private key....
April 11, 2014
Below is what we thought as of 12:27pm UTC. To verify our belief we crowd sourced the investigation. It turns out we were wrong. While it takes effort, it is possible to extract private SSL keys....
April 07, 2014
Today a new vulnerability was announced in OpenSSL 1.0.1 that allows an attacker to reveal up to 64kB of memory to a connected client or server (CVE-2014-0160). We fixed this vulnerability last week before it was made public. ...
April 03, 2014
This post is about a new feature we've been quietly rolling out over the last few months. Last week we began enabling it for everyone by default. ...
April 01, 2014
A cornerstone of CloudFlare's infrastructure is our ability to serve DNS requests quickly and handle DNS attacks. To do both those things we wrote our own authoritative DNS server called RRDNS in Go. ...
February 23, 2014
On Monday, February 10th, CloudFlare experienced a large DDoS attack, with nearly 400Gbps of NTP attack traffic hitting our network. ...
February 13, 2014
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....
