R356. Verify sub-domain names


The system should regularly check DNS names and sub-domain names in use by the application for expiration or change. This helps protect applications from the effects of sub-domain takeover attacks.


  1. CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action. The software performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it does not properly ensure that the IP address is truly associated with the hostname.

  2. OWASP Top 10 A6:2017-Security Misconfiguration. Security misconfiguration is the most commonly seen issue. This is commonly a result of insecure default configurations, incomplete or ad hoc configurations, open cloud storage, misconfigured HTTP headers, and verbose error messages containing sensitive information. Not only must all operating systems, frameworks, libraries, and applications be securely configured, but they must be patched/upgraded in a timely fashion.

  3. OWASP-ASVS v4.0.1 V10.3 Deployed Application Integrity Controls.(10.3.3) Verify that the application has protection from sub-domain takeovers if the application relies upon DNS entries or DNS sub-domains, such as expired domain names, out of date DNS pointers or CNAMEs, expired projects at public source code repos, or transient cloud APIs, serverless functions, or storage buckets (autogen-bucket-id.cloud.example.com) or similar. Protections can include ensuring that DNS names used by applications are regularly checked for expiry or change.

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