Adversaries may gather information about the victim's DNS that can be used during targeting. DNS information may include a variety of details, including registered name servers as well as records that outline addressing for a target’s subdomains, mail servers, and other hosts. DNS MX, TXT, and SPF records may also reveal the use of third party cloud and SaaS providers, such as Office 365, G Suite, Salesforce, or Zendesk.(Citation: Sean Metcalf Twitter DNS Records)
Adversaries may gather this information in various ways, such as querying or otherwise collecting details via DNS/Passive DNS. DNS information may also be exposed to adversaries via online or other accessible data sets (ex: Search Open Technical Databases).(Citation: DNS Dumpster)(Citation: Circl Passive DNS) Gathering this information may reveal opportunities for other forms of reconnaissance (ex: Search Open Technical Databases, Search Open Websites/Domains, or Active Scanning), establishing operational resources (ex: Acquire Infrastructure or Compromise Infrastructure), and/or initial access (ex: External Remote Services).
Adversaries may also use DNS zone transfer (DNS query type AXFR) to collect all records from a misconfigured DNS server.(Citation: Trails-DNS)(Citation: DNS-CISA)(Citation: Alexa-dns)
Detection of DNS
Software Configuration: Software configuration refers to making security-focused adjustments to the settings of applications, middleware, databases, or other software to mitigate potential threats. These changes help reduce the attack surface, enforce best practices, and protect sensitive data. This mitigation can be implemented through the following measures:
Conduct a Security Review of Application Settings:
Implement Access Controls and Permissions:
Enable Logging and Monitoring:
Update and Patch Software Regularly:
Disable Unnecessary Features or Services:
Test Configuration Changes:
Tools for Implementation
Configuration Management Tools:
Security Benchmarking Tools:
Vulnerability Management Solutions:
Logging and Monitoring Tools:
No cross-framework mappings available