At Cloudflare, engineers spend a great deal of time refactoring or rewriting existing functionality. When your company doubles the amount of traffic it handles every year, what was once an elegant solution to a problem can quickly become outdated as the engineering constraints change. Not only that, but when you’re averaging 40 million requests a […]
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One year of war in Ukraine: Internet trends, attacks, and resilience
The Internet has become a significant factor in geopolitical conflicts, such as the ongoing war in Ukraine. Tomorrow marks one year since the Russian invasion of that country. This post reports on Internet insights and discusses how Ukraine’s Internet remained resilient in spite of dozens of disruptions in three different stages of the conflict. Key […]
The Chief Zero Trust Officer: a new role for a new era of cybersecurity
Setting the stage for Zero Trust Over the last few years the topic of cyber security has moved from the IT department to the board room. The current climate of geopolitical and economic uncertainty has made the threat of cyber attacks all the more pressing, with businesses of all sizes and across all industries feeling […]
A look at Internet traffic trends during Super Bowl LVII
The Super Bowl has been happening since the end of the 1966 season, the same year that the ARPANET project, which gave birth to the Internet, was initiated. Around 20 years ago, 50% of the US population were Internet users, and that number is now around 92%. So, it’s no surprise that interest in an […]
Cloudflare mitigates record-breaking 71 million request-per-second DDoS attack
This was a weekend of record-breaking DDoS attacks. Over the weekend, Cloudflare detected and mitigated dozens of hyper-volumetric DDoS attacks. The majority of attacks peaked in the ballpark of 50-70 million requests per second (rps) with the largest exceeding 71 million rps. This is the largest reported HTTP DDoS attack on record, more than 35% […]
Manage and control the use of dedicated egress IPs with Cloudflare Zero Trust
Before identity-driven Zero Trust rules, some SaaS applications on the public Internet relied on the IP address of a connecting user as a security model. Users would connect from known office locations, with fixed IP address ranges, and the SaaS application would check their address in addition to their login credentials. Many systems still offer […]
Cloudflare's handling of a bug in interpreting IPv4-mapped IPv6 addresses
In November 2022, our bug bounty program received a critical and very interesting report. The report stated that certain types of DNS records could be used to bypass some of our network policies and connect to ports on the loopback address (e.g. 127.0.0.1) of our servers. This post will explain how we dealt with the […]
Uptick in healthcare organizations experiencing targeted DDoS attacks
Healthcare in the crosshairs Over the past few days, Cloudflare, as well as other sources, have observed healthcare organizations targeted by a pro-Russian hacktivist group claiming to be Killnet. There has been an increase in the amount of healthcare organizations coming to us to help get out from under these types of attacks. Multiple healthcare […]
CVE-2022-47929: traffic control noqueue no problem?
USER namespaces power the functionality of our favorite tools such as docker, podman, and kubernetes. We wrote about Linux namespaces back in June and explained them like this: Most of the namespaces are uncontroversial, like the UTS namespace which allows the host system to hide its hostname and time. Others are complex but straightforward – […]
Cyberattacks on Holocaust educational websites increased in 2022
Today we mark the International Holocaust Remembrance Day. We commemorate the victims that were robbed of their possessions, stripped of their rights, deported, starved, dehumanized and murdered by the Nazis and their accomplices. During the Holocaust and in the events that led to it, the Nazis exterminated one third of the European Jewish population. Six […]
