The Results of the CloudFlare Challenge
2014-04-11
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....
Answering the Critical Question: Can You Get Private SSL Keys Using Heartbleed?
2014-04-11
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....
Jetpack for WordPress: automatic protection
2014-04-10
As we've said before, lots of our users run WordPress on their websites and its popularity makes it a big target. So when a new vulnerability is discovered, acting quickly is prudent....
Staying ahead of OpenSSL vulnerabilities
2014-04-07
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. ...
Introducing CNAME Flattening: RFC-Compliant CNAMEs at a Domain's Root
2014-04-03
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. ...
The weird and wonderful world of DNS LOC records
2014-04-01
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. ...
How to ensure your server's software stays secure?
2014-03-17
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. ...
I joined CloudFlare on Monday along with 5,000 others
2014-03-13
There are days when you feel quite ecstatic and know you have succeeded in completing each and every task set before you. Monday was one of those days - well nearly....
What do you do when the world’s attention is on you?
2014-03-12
This is a guest post from Rodney Gibbs. Rodney is the CIO of The Texas Tribune, a nonprofit media organization that covers public policy, politics, and government. ...
WordPress Pingback Attacks and our WAF
2014-03-11
At CloudFlare a lot of our customers use WordPress, that's why we have our own plugin, we hang out at WordCamp and we wrote a WordPress specific ruleset for our Web Application Firewall....
ECDSA: The digital signature algorithm of a better internet
2014-03-10
This blog post is dedicated to the memory of Dr. Scott Vanstone, popularizer of elliptic curve cryptography and inventor of the ECDSA algorithm. He passed away on March 2, 2014....
It's Go Time on Linux
2014-03-05
Some interesting changes related to timekeeping in the upcoming Go 1.3 release inspired us to take a closer look at how Go programs keep time with the help of the Linux kernel. Timekeeping is a complex topic and determining the current time isn’t as simple as it might seem at first glance....
Introducing lua-capnproto: better serialization in Lua
2014-02-28
When we need to transfer data from one program to another program, either within a machine or from one data center to another some form of serialization is needed....
CloudFlare Publishes Transparency Report for 2013
2014-02-27
On January 27, the Department of Justice and the Director of National Intelligence announced a change in rules governing the disclosure of National Security Orders....
Cloudflare Acquires StopTheHacker
2014-02-24
We're excited to announce that Cloudflare has acquired the anti-malware firm StopTheHacker. I wanted to share a little bit about the rationale behind the acquisition and what to expect from the two teamed up companies going forward....
Good News: Vulnerable NTP Servers Closing Down
2014-02-23
On Monday, February 10th, CloudFlare experienced a large DDoS attack, with nearly 400Gbps of NTP attack traffic hitting our network. ...
Staying up to date with the latest protocols: SPDY/3.1
2014-02-17
Back in June 2012 CloudFlare started a beta rollout of Google's then new SPDY protocol and we took a detailed look at how SPDY makes web sites faster....
Introducing Strict SSL: Protecting Against a On-Path Attack on Origin Traffic
2014-02-14
At CloudFlare, we are always looking for ways to improve the security of our customers’ websites. One of the features we provide is the ability to serve their website encrypted over SSL/TLS. ...
Technical Details Behind a 400Gbps NTP Amplification DDoS Attack
2014-02-13
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....