aegis-dns-takeover SKILL.md skillA
aegis-dns-takeover from as-foss/aegis-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add as-foss/aegis-skills/aegis-dns-takeover@git:20260826.9702747Pins git:20260826.9702747 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- as-foss/aegis-skills
- Path
skills/code/dns-takeover/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260826.9702747, committed Aug 26, 2026
- First version recorded
- Aug 25, 2026
- Size
- 38,789 bytes
- Repository stars
- 16
- License
- Apache-2.0
Audit playbook module for DNS attack surface and subdomain takeover (CWE-350), covering claimed-hostname inventory extraction from repo/IaC artifacts, dangling-record reasoning from decommission asymmetry, provider claim-table fingerprinting for authorized live verification, zone-hygiene review, and TTL-aware safe-decommission remediation.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
## Scope & Objectives ### Objective Audit every hostname the organization claims — as evidenced by repository artifacts — and determine which of those claims can be hijacked by an attacker who registers the underlying service. For each finding produce: file:line evidence of the claimed hostname, the DNS target it resolves to, the owning artifact chain (config -> IaC -> docs), a takeover-precondition assessment per the claim table below, a status of `Confirmed-static`, `Dangling-candidate (Needs-Review)`, or `Verified-live`, and a blast-radius statement naming exactly which cookies, OAuth clients, CSP/CORS allowlists, or phishing-trust surfaces depend on that name. ### In Scope | Class | Typical finding | Primary CWE | |---|---|---| | Dangling CNAME to PaaS | `legacy-marketing.example.com` still points at `acme-legacy.herokuapp.com`; app was deleted in a teardown script but the record remains | CWE-350 | | Dangling alias to object-storage website endpoints | Route53 A-alias to `acme-old-assets.s3-website-us-east-1.amazonaws.com` whose bucket no longer exists | CWE-350 | …
Read the whole file at its exact version.
How to install
mdr add as-foss/aegis-skills/aegis-dns-takeover@sha256:e30995e60120b7eeThe line at the top of this page pins the label git:20260826.9702747, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_667q4dunmzflewb6)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Aug 25, 2026 and Aug 26, 2026, more than one a day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260826.9702747 latest | 2026-08-26 | 9702747 | 38,789 B | A | view · diff |
| git:20260825.85624bc | 2026-08-25 | 85624bc | 38,790 B | A | view · diff |
| git:20260825.244c198 | 2026-08-25 | 244c198 | 37,691 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (38789 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
as-foss/aegis-skills · 16 stars · license Apache-2.0 · pushed 2026-08-26 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_667q4dunmzflewb6 GET https://markdownregistry.com/api/v1/resolve?ref=as-foss/aegis-skills/aegis-dns-takeover GET https://markdownregistry.com/api/v1/blob/e30995e60120b7eeaca03f6834bf7d5eaa3933c29ac280dc37eac516be55a5ad
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.