DNS Server Security Check: Identifying Risk And Common Security Vulnerabilities

DNS servers can be vulnerable, causing users to go to malicious sites rather than the sites intended. Once DNS services are compromised, Internet use is never again the same.  In such cases, organizations should consider doing a DNS server security check to secure online business at each layer to secure business reputation and avoid financial loss.

DNS is a network service intended to make an interpretation of domain names to an IP address.  Routers on the Web use the IP address to send packets to the server hosting the desired website.

A workstation “resolves” the domain name by sending a DNS query to a DNS server.  Inside a professional workplace, this initial DNS server is usually on the internal network or hosted by the organization's ISP.  This initial DNS caching server is not the official vault for any domains other than those belonging to the managing organization, but it reserves other domain name/IP address pairs resolved for the benefit of internal users.

If the domain name asked for by a user is found, the name and IP address are stored in the resolving DNS server’s cache.  Caching this information allows the server to the domain name query locally, decreasing resolution time and enhancing the user’s browsing performance.

A vulnerability known for quite a while involves how query responses are overseen. When a resolver sends a query to an authoritative server, the response should exactly match the query. Servers owned by cybercriminals could force a DNS resolver to attempt to resolve a domain name they wanted to imitate and afterward, send response packets with an IP address of a malicious site.  The resolving server cached the malicious address rather than the genuine one.

In the early days of the Web, DNS server security check wasn’t a big concern.  The few servers connected for information exchange and research were controlled by ethical and responsible individuals.  Services like DNS were created in this condition of trust, so there’s no frequent need for a DNS server security check.

But now, you should think about the DNS server security check of your domain which can lead to sensitive information leakage when misconfigured. Such domain is also exposed to security risk where an attacker can exploit it.

Your IT team needs to do a DNS server security check to solidify your domain name from virtual threats. Insecure domain and registrar practices allow attackers to hijack your site and divert your guests to any server they need.

There are two different ways to guarantee your DNS/domain is secure from online threats:

  • Using registrar which provides the highest level of security
  • Using cloud-based security provider which provides web securing including DNS server security check

There are still a few issues with DNS server security check, including a new issue that seems fixable only when Domain Name System Security Extensions (DNSSEC) are sent.  Also, over a million DNS servers still don't seem to utilize changing port numbers and use sequentially numbered ports as means of the DNS server security check.

If you are uncertain whether your in-house or ISP DNS servers are vulnerable to spoofing ---  the situation in which a program successfully masquerades as another by falsifying data --- Comodo, the global leader in cyber security solutions, strongly urges your network administrators to do DNS server security check through its DNS-based Security-as-a-Service (SaaS) solution Comodo Dome as soon as possible.

The DNS server security check of Comodo Dome helps in identifying and eliminating the local host infections and makes a customizable log report, which further prevents similar threats from attacking the servers in future.

Comodo Dome is a cloud-based secure web platform that can be moduled to fit your necessities. Comodo Dome’s free web filter is also easy to deploy and maintain. Comodo Dome is a proven expert in DNS server security check, malware blocking, and phishing blocking. When a server is infected, Comodo Dome usually connects to its botnet host server. It blocks the known botnet host server communications and the list of these host servers keep continually upgraded thus giving DNS protection.

Comodo Dome also provides you with a number of customization options. You can customize reports, the list of botnets, malware, content filters, blacklists and whitelists, and many more of such known servers which can compromise your DNS protection.

With Comodo Dome, you have complete DNS server security check from the widest range of DNS-based attacks, while maintaining service availability and business continuity. Start your FREE trial now!