unboundcompute/security-agent-skills · skills/hunting-subdomain-takeover-and-dangling-dns/SKILL.md

hunting-subdomain-takeover-and-dangling-dns skillA

hunting-subdomain-takeover-and-dangling-dns is agent-read markdown (skill) from unboundcompute/security-agent-skills: Hunt DNS records that point at infrastructure the organization no longer controls, so an attacker can claim the target and serve content under a trusted name. Covers a CNAME or ALIAS to a decommissioned platform host that the provider lets anyone re-register, a dangling NS delegation whose nameserver or zone no longer exists in the account, a record that outlives its resource because infrastructure-as-code or a teardown pipeline deletes the resource but not the record, and a wildcard or unclaime.

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add unboundcompute/security-agent-skills/hunting-subdomain-takeover-and-dangling-dns@git:20260823.e797ed0
Exact content
mdr add unboundcompute/security-agent-skills/hunting-subdomain-takeover-and-dangling-dns@sha256:1a255fda0d07bf17

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_s3bwmrvqbvcw4zog.svg)](https://markdownregistry.com/a/art_s3bwmrvqbvcw4zog)

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Versions

versioncommittedcommitsizeaudit
git:20260823.e797ed0 latest2026-08-23 e797ed0 9,611 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (9611 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

unboundcompute/security-agent-skills · 5 stars · license MIT · pushed 2026-09-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_s3bwmrvqbvcw4zog
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-subdomain-takeover-and-dangling-dns
GET https://markdownregistry.com/api/v1/blob/1a255fda0d07bf174f3c24dcf86266ffc4c4e0f8011583dbb52becf7f19e748f

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.