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DNSTake:
A fast tool to check missing hosted DNS zones that can lead to subdomain takeover.
What is a DNS takeover?
DNS takeover vulnerabilities occur when a subdomain (subdomain.example.com) or domain has its authoritative nameserver set to a provider (e.g. AWS Route 53, Akamai, Microsoft Azure, etc.) but the hosted zone has been removed or deleted. Consequently, when making a request for DNS records the server responds with a SERVFAIL error. This allows an attacker to create the missing hosted zone on the service that was being used and thus control all DNS records for that (sub)domain.
Workflow
DNSTake use RetryableDNS client library to send DNS queries. Initial engagement using Google & Cloudflare DNS as the resolver, then check & fingerprinting the nameservers of target host — if there is one, it will resolving the target host again with its nameserver IPs as resolver, if it gets weird DNS status response (other than NOERROR/NXDOMAIN), then it’s vulnerable to be taken over. More or less like this in form of a diagram.