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You all know what DNS is, and I don’t think any more information is needed on it. Our Internet world exists due to DNS technology, and exploiting DNS can bring down the Internet for a day or month, or in a particular region. One of the common attacks that we heard about in 2012 was Operation Global Blackout, wherein the attacker ‘Anonymous’ threatened to take down the complete global Internet. Kendrick Lamar Mp3 Hard Core Songs.

Computer security experts were worried and have taken additional layers of protection to secure the network, particularly DNS. Have you ever come up to a scenario where you were not able to access a website because it was blocked by proxy?

Then you need to use DNS tunnelling concepts to bypass the proxy. By using DNS tunnelling, a user will be able to access a website even though the proxy is blocking the website.

Normally when you consider a proxy server, all the HTTP traffic will be received by a proxy server, but no DNS traffic will fall on a proxy server. So exploiting this DNS traffic will allow us to use all blocked websites as well. So on a DNS tunnel, data are encapsulated within DNS queries and replies, using base32 and base64 encoding, and the DNS domain name lookup system is used to send data bi-directionally. Therefore, as long as you can do domain name lookups on a network, you can tunnel any kind of data you want to a remote system, including the Internet.

We use DNS records (NULL/TXT/SRV/MX/CNAME) to encapsulate (downstream) IP traffic. In the above scenario, Users A and B are behind a corporate firewall D, and no websites are allowed from Users A and B, and only traffic via port 53 is allowed from firewall D. User A and User B can use the Internet by exploiting DNS traffic via DNS tunnelling. The DNS server on the left side has a caching capability, so when user A tries to access any websites that are already in the cache, then the request won’t go to the iterative server. If some new request is initiated from User A, then the DNS server will not find its A record in the DNS server, so it will send to an outside DNS server.

The maximum length of a DNS query is 255 characters with a limitation of 63 chars per label and is in the form: label3.label2.label1.example. To tunnel data over DNS, we need control of an external DNS server (in our case, the DNS server to the right), and we add two records on the external DNS server. One is NS record and the other is A record. NS (name server) record allows you to delegate a subdomain of your domain to another name server.

So if you have a domain laptop.com you can add a NS record like a.laptop.com NS computer.com which means any DNS query to laptop.com will be delegated to computer.com and its subdomains. The other one is the A record, which contains the IP address mapping to domain name. Now if we need to setup a DNS tunnel server, we can install an Iodine, DNS tunnelling script, DNScapy, etc. So in the end machine, there has to be a DNS tunnelling client. Once the connection is done, we can use the SOCKS proxy for an uninterrupted connection.