Why a DNS Firewall is of Uttermost Importance
Basic DNS resolvers play the role of gateways between an organization and the rest of the universe. Proprietary information, communications, and private data belonging to customers might be jeopardized if a user connects to a malicious location thanks to a DNS resolver.
Despite such dangers, the typical DNS resolver employed by organizations is not only susceptible to a variety of direct attacks but also lacks an integrated security layer, which is a requirement when it comes to identifying malicious locations and offering protection to the company’s users. It is the same as having an internet gateway that lacks security as opposed to one ideally protected by a firewall.
Such situations arise because, from its inception, DNS continues to enjoy treatment as a pure and unquestionable protocol regardless of the consequences. This attitude has blinded the standard network operator on the reasonable need to either redirect or filter public DNS responses to protect an organization. With regards to resolving external DNS responses, my network my rules is a forgotten mantra.
As a result, the usual DNS resolution process rarely prevents the users’ potential to arrive at known malicious sites. It, however, allows penetration by infectious malware, which freely communicate with the controlling machines of an infected organization.
Dangers and Solutions
In 2009, a Google employee clicked on a malicious link embedded in an instant message to set off a series of events popularly known as Aurora. This infiltration of Google's network lasted for several months and resulted in the theft of data.
By examining the log files from their DNS resolvers, where they quickly spotted the movements of their attackers, Google determined the scope of this attack within their network. Today, the perpetration of similar attacks against major companies the world over continues.
Such attacks can be identified and mitigated while still in their earliest stages if every organization employs a secure DNS resolver capable of blocking connections to malicious locations.
Spear phishing:Since spear phishing attacks seem like they are coming from trusted sources, they are highly effective in dropping malware. Employees or partners will inevitably fall for such scams to provide a foothold for hackers and once quietly in, such attacks could spread quickly, which consequently puts all the vital information at risk.
There is a minimal chance that your traditional firewall defenses have the ability to keep up with the tactics employed by malware including the use of hostnames and alterations when it comes to IP addresses.
However, an appropriately maintained dns firewall has the capability to block the access of the DNS information with regards to such malicious hostnames, which prevents the connection or diverts traffic from the infected computer to a safe server for inspection.
Organizations can reduce the risk of losing information and also stymie at least 80 percent of today’s malware, by simply implementing this single layer of defense. This approach ought to be considered as an important layer when it comes to the security concerns of any enterprise, especially as it is highly effective. It is also of considerable importance to note that security companies usually know almost every other malware attack by its DNS communications pattern.