unboundcompute/security-agent-skills · skills/hunting-os-command-injection/SKILL.md

hunting-os-command-injection skillA

hunting-os-command-injection is agent-read markdown (skill) from unboundcompute/security-agent-skills: Hunt OS command injection where untrusted input reaches a process-spawning API through a shell that interprets metacharacters. Covers a command string passed to a system or shell-exec call, a spawn that requests a shell, and indirect shells reached through wildcards, subshells, environment values, or an attacker-influenced PATH or IFS. The distinguishing fact is the shell: a direct exec with a fixed program and an argument vector does not interpret metacharacters and is not this bug, while any s.

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-os-command-injection@git:20260903.6dac719
Exact content
mdr add unboundcompute/security-agent-skills/hunting-os-command-injection@sha256:d783fe805f0181b8

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_ivggi2j4xle3hw5k.svg)](https://markdownregistry.com/a/art_ivggi2j4xle3hw5k)

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Versions

versioncommittedcommitsizeaudit
git:20260903.6dac719 latest2026-09-03 6dac719 9,217 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 (9217 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_ivggi2j4xle3hw5k
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-os-command-injection
GET https://markdownregistry.com/api/v1/blob/d783fe805f0181b8e601734c05c73fdfb299945152824ce3e65b50f91aede59f

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