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ctf-web

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CTF web challenge playbook — the recurring shapes jeopardy web challenges take: source disclosure (.git, backups, flask debug), SSTI/SSRF in their CTF forms, PHP quirks (type juggling, wrappers, filters), cookie/JWT games, and chained primitives to read /flag. Load on any CTF challenge whose handout is a URL. Signals: "web" category, flask/werkzeug or PHP banner, /flag or flag.txt on the box, robots.txt, provided app.py/index.php source, JWT or flask session cookie.

skills/ctf/ctf-web/SKILL.md

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# CTF web challenges

## When it applies
The handout is a URL (sometimes plus source). The goal is almost always to read a flag file
(`/flag`, `/flag.txt`, an env var, or a DB row) — so every bug you find should be steered toward
*read a file*, *run a command*, or *become admin*. This skill is the CTF routing layer; work the
deep techniques with `web-ssti`, `web-ssrf`, `web-sqli`, `web-lfi-path-traversal`, `web-auth-jwt`,
`web-deserialization`, `web-command-injection`, `web-file-upload`.

## Why it works
CTF web challenges strip an app to one intended bug plus decorations, so the surface is small and
the bug is findable by *enumeration*, not luck. Provided source turns black-box guessing into
reading comprehension; the framework banner (Flask/PHP/Express) predicts the bug class before you
send a request.
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