Individual skill
web-lfi-path-traversal
Local File Inclusion / path traversal → read files, sometimes RCE. Load when a param names a file/path/template/page: ?file=, ?page=, ?template=, ?download=, ?lang=, or path segments. Signals: filenames in params, "include", download endpoints, `../` filtered, `.php?page=`.
skills/web/web-lfi-path-traversal/SKILL.md
Source commit ee0e0c50d2f6d941a14b73dd85a2b470d0ab976e
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- Observed behavior
- Not checked yet
- Last checked
- Nov 7, 2026
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Repository context
- Repository stars (not skill ratings)
- 27
- Repository last updated
- Oct 14, 2026
- License
- MIT
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- agent-skills Repository topic
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Files and excerpt
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# LFI / path traversal
## When it applies
A parameter or path segment controls which file the server reads/includes. Path traversal reads
arbitrary files; LFI (include) can execute them → RCE.
## Why it works
The app builds a filesystem path from user input without normalizing/constraining it, so `../`
sequences escape the intended directory. If the value is `include`d (PHP), included content is executed.
## Method
1. **Read a canary**: `?file=/etc/passwd`, then traversal `?file=../../../../etc/passwd`; on
Windows `..\..\..\windows\win.ini`.
2. **Defeat filters**: URL-encode `..%2f`, double `..%252f`, `....//` (strip-once), overlong