Every day, over 345 billion emails are sent around the globe, each triggering a number of DNS lookups to determine its destination and validity. It goes without saying, the security of DNS records, specifically TXT records, is vital. However, the phenomenon of dangling DNS—where CNAME records point to domains that no longer exist—presents a systemic vulnerability with significant implications....
CNAME resource records have been widely used since RFC 1034 and 1035. However, it is well known that using CNAMEs increases the work required for name resolution. The interpretation of the wire format, including CNAME responses, is clear but very complex. It is performed within the application process using libc'sgetaddrinfo() and gethostbyname(), so interpreting complex CNAMEs takes time. In...
Generative AI tools like ChatGPT have suddenly risen in fame but DNS is a complex topic. The Gen AI tools are increasingly relied upon by application owners who are not DNS experts to find answers for DNS related questions. DNS is used by various services such as LetsEncrypt or Google-Site to establish domain ownership and these services ask application owner to add CNAME, TXT and A records in...
