When it comes to the fundamentals of networking, few technologies are as well established as the Domain Name System (DNS). Over the past three decades, DNS has remained a requirement for how we share and access information online. One change, however, is the level of scrutiny given to DNS as a potential security vulnerability in today’s network environment. In particular, hackers are exploiting DNS as a pathway for data exfiltration. That’s right — someone could be siphoning valuable or sensitive information from your network through DNS.
The use of DNS, specifically port 53, for data theft is often called DNS tunneling. In tunneling, malicious insiders or outside hackers use the DNS protocol as an established pathway, or tunnel, directing the exchange of information for malicious purposes.
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