PHP 5 Still 3 Times More Popular than PHP 7, Even With End of Support Looming

December 13, 2018 by The Censys Team

First released in 2004, PHP 5 is one of the most popular web scripting languages in use today, but in a few weeks (December 31) PHP 5 will stop receiving security patches. We break down how many hosts are still "Powered by PHP" versions 5 and 7. If you’re worried about your sites’ web applications, don’t worry; there are some actions below which will help determine whether this a problem for your particular network along with guidance on steps to take to remediate the risk.

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Finding Apache Tomcat Servers in Your Network

December 4, 2018 by Sally Feller

Today, we’re going to show you how you might look for suspicious-looking Apache Tomcat servers and either secure them or take them offline to prevent exploitation.

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Who's Down with IPP?: Finding Internet-Connected Printers with Censys

September 24, 2018 by The Censys Team

Censys results now include Internet Printing Protocol (IPP), which allows anyone to get a quick read of how many printers are connected to the Internet and locate any printers their organization may have inadvertently exposed to the public.

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Find Oracle Database Servers with CVE-2018-3110 Vulnerability

September 21, 2018 by The Censys Team

Oracle recently released a critical patch for their Database Server product. This post explains how to find servers on the Internet that are affected by this vulnerability.

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Introducing Relational Database Scanning

June 18, 2018 by The Censys Team

To help organizations investigate and monitor whether they’ve mistakenly exposed databases, we're adding scanning for four popular relational database servers: MySQL, PostgreSQL, Microsoft SQL Server, and Oracle Database.

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Announcing Censys Paid Plans

January 25, 2018 by The Censys Team

Last summer, Censys began a new chapter: we graduated from the University of Michigan and became a company. This transition will help Censys become an even more powerful tool for securing devices and networks, and it allows us to offer Censys to businesses and enterprises for the first time. Today, we’re introducing Censys Basic, Censys Pro, and Censys Enterprise paid plans, which allow commercial use and include technical support.

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Tracking the Mirai Botnet

December 14, 2017

The Mirai botnet, composed primarily of embedded and IoT devices, took the Internet by storm in late 2016 when it overwhelmed several high-profile targets with massive distributed denial-of-service (DDoS) attacks. The Censys team joined forces with collaborators from across the security field to track Mirai-infected devices, analyze the botnet's evolution, and understand how to improve defenses.

Read More at the Cloudflare Blog

DROWN: Decrypting RSA with Obsolete and Weakened eNcryption

July 1, 2016

DROWN is a serious vulnerability that affects HTTPS and other services that rely on TLS. It allows attackers to break the encryption and read or steal sensitive communications. We were part of a collaborative effort that discovered DROWN and measured its impact. 33% of all HTTPS servers were vulnerable to the attack.


Weak Diffie-Hellman and the Logjam Attack

May 20, 2015

Diffie-Hellman key exchange is a cryptographic algorithm that is fundamental to many protocols, including TLS, SSH, and IPsec. We and colleagues uncovered important weaknesses in how Diffie-Hellman has been deployed: the Logjam attack against TLS, and the likelihood that nation-state attackers can defeat 1024-bit Diffie-Hellman.


The FREAK Attack

March 3, 2015

The FREAK attack allows an attacker to intercept HTTPS connections between vulnerable clients and servers and force them to use weakened encryption, which the attacker can break to steal or manipulate sensitive data. Shortly after the attack was announced, we began tracking the population of vulnerable sites.

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The POODLE Attack and Tracking SSLv3 Deployment

October 14, 2014

In October 2014, Google disclosed the POODLE attack, a padding oracle attack that targets CBC-mode ciphers in SSLv3. The vulnerability allows an active MITM attacker to decrypt content transferred an SSLv3 connection. Data we collected about SSLv3 deployment helped support browser-makers' decision to disable support for SSLv3.

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Heartbleed Bug Health Report

April 7, 2014

The Heartbleed Bug is a vulnerability in the OpenSSL cryptographic library that allows attackers to invisibly read sensitive data from a web server. This potentially includes cryptographic keys, usernames, and passwords. We and our collaborators tracked the vulnerable population and measured exploitation attempts, and later published a comprehensive analysis of the vulnerability and its aftermath.

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HTTPS Ecosystem Scans

October 1, 2013 by Zakir Durumeric

We report the results of a large-scale measurement study of the HTTPS certificate ecosystem—the public-key infrastructure that underlies nearly all secure web communications. Using data collected by performing 110 Internet-wide scans over 14 months, we gain detailed and temporally fine-grained visibility into this otherwise opaque area of security-critical infrastructure.

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Widespread Weak Keys in Network Devices

August 8, 2012

We and colleagues performed a large-scale study of RSA and DSA cryptographic keys in use on the Internet and discovered that significant numbers of keys are insecure due to insufficient randomness. Nearly 6% of TLS hosts and nearly 10% of SSH hosts share public keys in an apparently vulnerable manner, due to either insufficient randomness during key generation or device default keys. Nearly all the vulnerable hosts are headless and embedded network devices, such as routers, firewalls, and server management cards.