Building a DNS Leak Detection Server with Python
Introduction DNS leaks are commonly discussed as a privacy concern when using VPNs or other privacy tools. However, the real danger lies in data exfiltration from protected environments, even those with external access locked down in and out. The critical vulnerability is this: even if your DNS query goes to your private DNS resolver first, it eventually reaches the public internet to resolve unknown domains. If an attacker crafts a domain with a specifically configured DNS server, they can log these queries and extract sensitive data that was embedded in the subdomain. ...