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Day 16: Mastering Subdomain Takeover Vulnerability — Essential Tricks & Techniques Based on Personal Experience and Valuable POCs
[ In collaboration with Abhijeet Kumawat ( his LinkedIn | Twitter)]
Hey geeks, it4chis3c (Twitter) here with one more write-up on tricks & tips to detect Subdomain Takeover Vulnerability.
1. Brief Description
- Definition: Subdomain takeover occurs when an attacker takes control of an organization’s subdomain by exploiting misconfigured DNS settings, particularly when the subdomain points to a non-existent or unclaimed resource on a third-party hosting service.
- Impact: Allows attackers to serve malicious content, steal cookies, or conduct phishing attacks under the guise of the legitimate domain.
2. Where to Detect
- Subdomains with CNAME Records: Focus on subdomains with CNAME records pointing to third-party services (e.g., GitHub Pages, AWS S3, Heroku).
- DNS Zone Files: Monitor DNS zone files for subdomains that may point to inactive or unclaimed services.
- Expired Services: Subdomains that previously pointed to services that are no longer in use or have been removed by the organization.
