Can someone explain how DNS tunneling really works?

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Asked By CuriousCat123 On

Hey everyone! I'm trying to grasp how DNS tunneling functions. From what I've read, it seems like the client sends DNS queries to a server, and then somehow an attacker intercepts this information and uses it to insert malicious software into those requests? It's all a bit overwhelming and confusing for me.

2 Answers

Answered By TechGuru77 On

DNS tunneling is interesting because it exploits the fact that DNS traffic is often allowed through firewalls without much scrutiny. Think about it: if malware on a computer wants to receive commands, it typically would use blocked ports (like 1234 or even 80), but not DNS port 53. Instead, it can send a DNS query to a domain like malicious.software.com asking for a TXT record. As long as the DNS server accepts those queries, the malware can continuously receive commands through these harmless-looking DNS requests.

SneakyBird89 -

Not useful? I disagree! It’s handy for bypassing paywalls, like those at hotels or on planes. You just need a quick connection without handing over your credit card. I’ve used it quite successfully while traveling.

Answered By CyberSecWhiz On

With DNS tunneling, you can send various types of traffic, even SSH, through DNS requests—though it’s a bit slow. The main concerns are that attackers can use it for data exfiltration, as it gives them a discreet backdoor to send stolen information out of a network. Plus, it can enable them to maintain control over compromised systems without needing direct access. It's a sneaky method for both control and hidden communication!

InfoDive101 -

So, if I follow correctly, an attacker can set up their own DNS server and use it to grab data from clients while directing traffic wherever they want, right?

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