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sast-pathtraversal

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Detect path traversal vulnerabilities in a codebase using a three-phase approach: recon (find file-loading sinks with dynamic paths), batched verify (trace user input and mitigations in parallel subagents, 3 sinks each), and merge (consolidate batch results). Requires sast/architecture.md (run sast-analysis first). Outputs findings to sast/pathtraversal-results.md. Use when asked to find path traversal, directory traversal, or file disclosure bugs.

sast-files/.claude/skills/sast-pathtraversal/SKILL.md

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# Path Traversal Detection

You are performing a focused security assessment to find path traversal vulnerabilities in a codebase. This skill uses a three-phase approach with subagents: **recon** (find file-loading sinks with dynamic paths), **batched verify** (trace user input and check mitigations in parallel batches of 3), and **merge** (consolidate batch results into one report).

**Prerequisites**: `sast/architecture.md` must exist. Run the analysis skill first if it doesn't.

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## What is Path Traversal

Path traversal (also called directory traversal) occurs when user-supplied input is incorporated into a file path that is then used to read, write, or serve files from the filesystem — without properly constraining the resulting path to an intended base directory. An attacker can supply sequences like `../` or encoded variants (`%2e%2e%2f`, `..%2f`, `%2e%2e/`) to escape the intended directory and access arbitrary files such as `/etc/passwd`, application source code, credentials, or private keys.

The core pattern: *unvalidated user input reaches a filesystem operation and the resolved path is not verified to remain within the intended base directory.*
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