hunting-dns-rebinding-and-ssrf-pivots SKILL.md skillA
hunting-dns-rebinding-and-ssrf-pivots from unboundcompute/security-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add unboundcompute/security-agent-skills/hunting-dns-rebinding-and-ssrf-pivots@git:20260829.b60f9b2Pins git:20260829.b60f9b2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- unboundcompute/security-agent-skills
- Path
skills/hunting-dns-rebinding-and-ssrf-pivots/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260829.b60f9b2, committed Aug 29, 2026
- Size
- 10,101 bytes
- Repository stars
- 26
- License
- MIT
Hunt server-side request forgery and DNS rebinding that turn a server into a proxy for the internal network: a URL or hostname a caller controls that the server fetches, a validation that checks the hostname once but connects later so a rebinding answer swaps it for an internal address, a redirect the fetcher follows into internal space, and a reached internal service (metadata endpoint, admin port, database) that trusts callers by network position. Covers server-side fetchers, webhooks…
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
# Hunting DNS rebinding and SSRF pivots: turning the server into a proxy for the inside Server-side request forgery is a position bug: a server sits inside the network with a fetcher that will connect to a destination the caller influences, and internal services around it trust callers by where they come from rather than who they are. So if an attacker can steer the server's outbound request, the server becomes their proxy into internal space, the cloud metadata endpoint, an admin port, a database that assumes anyone who can reach it belongs. DNS rebinding is the technique that defeats the usual defense: the server validates the hostname, sees a public address, and allows it, but between that check and the actual connection the attacker's DNS answer changes to an internal address, so the connection lands somewhere the check never approved. The same slip happens through a redirect the fetcher follows. The hunt is for caller-influenced destinations and for the gap between validating and connecting. You hunt this by finding server fetchers and testing whether the destination they connect to can be moved after the check. ## When to use …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/hunting-dns-rebinding-and-ssrf-pivots@sha256:b931a3d5099a90a0The line at the top of this page pins the label git:20260829.b60f9b2, 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_sl3u64uiod63abha)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 29, 2026.
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 (10101 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
unboundcompute/security-agent-skills · 26 stars · license MIT · pushed 2026-09-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_sl3u64uiod63abha GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-dns-rebinding-and-ssrf-pivots GET https://markdownregistry.com/api/v1/blob/b931a3d5099a90a022a4d8b1fa03ecb34a921ca92c958a5d9b495df69ff21a83
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.