Individual skill
subdomain-takeover-hunt
Detect and verify subdomain takeover via dangling CNAME to unclaimed services.
recon/subdomain-takeover-hunt/SKILL.md
Source commit 1260244136edc6ae698d76d3d526f503e322778d
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- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 1,363
- Repository last updated
- Nov 7, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- bug-bounty Repository topic
- cloud-security Repository topic
- firebase-hacking Repository topic
- hermes-agent Repository topic
- jwt-attacks Repository topic
- offensive-security Repository topic
- penetration-testing Repository topic
- reconnaissance Repository topic
- red-team Repository topic
- security-automation Repository topic
- recon Declared skill tag
- subdomain Declared skill tag
- takeover Declared skill tag
- cname Declared skill tag
- dns Declared skill tag
- cloud Declared skill tag
- heroku Declared skill tag
- s3 Declared skill tag
- azure Declared skill tag
- engineering Derived category
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# Subdomain Takeover Detection
Detect subdomains pointing to unregistered or unclaimed third-party cloud services. When a CNAME record points to a service that no longer exists, an attacker can register that resource and serve arbitrary content under the target's subdomain — enabling phishing, cookie theft, and full origin impersonation.
## When to Use
- Subdomain enumeration produces a large list — scan for lingering DNS records.
- Target uses cloud services with shared-namespace identifiers (Heroku, S3, Azure, Zendesk, Shopify).
- A subdomain returns NXDOMAIN, 404, or "no such app" error pages.
- The CNAME target is a service with user-registrable names.
## Prerequisites
- `terminal` with curl, dnsx, subfinder.