Individual skill

web-command-injection

Turn user input that reaches a shell into arbitrary OS command execution. Load when a parameter feeds a system call — ping/nslookup/host tools, file conversion (ImageMagick, ffmpeg), archive/ export, PDF/thumbnail generation, filename handling, or any "network tools" feature. Signals: output that looks like command output, a value echoed into a system utility, blind time/OOB behaviour.

skills/web/web-command-injection/SKILL.md

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Matches the observed repository HEAD: Yes
Scanner rules are current: Yes
Repository scan complete: No
Skill scan complete: Yes
Observed behavior: Network or broad shell
Last checked: Nov 11, 2026

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Repository context

Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

agent-skills Repository topic
ai-agents Repository topic
ai-security Repository topic
application-security Repository topic
blue-team Repository topic
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claude-code Repository topic
codex Repository topic
detection-engineering Repository topic
gemini Repository topic
engineering Derived category

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SKILL.mdcore · 2,885 bytes
cheatsheet.mddoc · 2,488 bytes
detection.mddoc · 3,083 bytes

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# OS command injection

## When it applies
A parameter is concatenated into a shell command the server runs (a `ping` diagnostic, an
`ImageMagick`/`ffmpeg` convert, a `tar`/`zip`, a filename passed to a CLI). If the value reaches
`/bin/sh -c` unsanitised, you can append your own command.

## Why it works
Building a command string from input and handing it to a shell means shell metacharacters keep their
meaning: `;`, `|`, `&&`, `$()`, and backticks all start a new command in the same context (usually
the web user). The app never intended a second command — the shell can't tell the difference.

## Method
> **Payloads & full variation set:** [`cheatsheet.md`](cheatsheet.md) next to this file — work the set, not the first line.