Why DNS Firewall Is Necessary For Institutions
April 25, 2017
by Picture Box

A DNS firewall is an essential tool in the modern internet. This is because malware has become more sophisticated and is circumnavigating traditional defenses. According to a recent study, over 91% malware utilizes DNS to command, to exfiltrate information and to divert movement. Customary insurance techniques don't catch DNS traffic to dangerous areas, so a DNS security layer is required.


Despite the extensive use of network security measures, The number of recent attacks has risen dramatically. The primary reason is that attackers have recognized and are exploiting the largely unprotected DNS-based Internet infrastructure. The hackers find loopholes in the system which is protected by a thin layer of security and therefore the data systems are at the mercy of the attackers. This is perilous as organizations can lose millions of dollars, worth of data.


How firewalls work

A firewall averts enterprise employees and framework associations with known malignant Internet areas and can give quick input to large firms security groups about potential compromises like botnets and APTs on their systems. All it takes to make a rundown of malicious domains or hostnames, which can be added effortlessly to the design of the DNS resolver server to block access to those areas naturally.


Another real advantage of a firewall is that you have the establishment you require, to set up with your current DNS resolver framework. Therefore, there's no hardware to introduce, real programming overhauls, organize reconfiguration projects, or other things that can hinder typical security solution deployment. Truth be told, a DNS firewall can be deployed in days or even hours using either seller arrangements, or with a couple of scripts, some excellent information sources, and a discussion with the DNS overseer for the system.


Importance of a DNS firewall

It acts as a gateway between the organization and the outside world. The absence of this resolver is very critical because if a user is connected to a malicious website or location, then, the communications, information, customer’s private data and more are in jeopardy. Without these firewalls, it is not only susceptible to direct attack, but also lacks an inbuilt security layer necessary to identify malicious websites from good ones.


Example of a recent DNS attack

A typical example of a DNS attack was that of Google. In 2009, a Google employee clicked on a malicious link in a message. This set off a series of attacks that resulted in the infiltration and exfiltration of Google’s data for months and theft of data from their different servers. Google was finally able to determine the attack by examining its DNS log files, where attacker’s movement was easily spotted. The same attack took place in different companies. The attacks wouldn’t have happened if they used a DNS firewall.


DNS firewalls or resolvers are an essential strategic security asset to the modern enterprises. The firewalls add a critical layer of defense to combat the alarming number of hackers, advanced persistent threats (APTs) and other malware. It should be seamlessly integrated into the intranet and internet activities of every organization to survive. For additional resources, visit www.bluecatnetworks.com.