🛡️ Sentinel: [CRITICAL] Fix Path Traversal in Video API

[Cukurikik]

🚨 Severity: CRITICAL
💡 Vulnerability: Path Traversal in the video API route (src/app/api/video/[tool]/route.ts). The API receives a file upload and directly concatenates file.name to form the target save path. An attacker could craft a payload with a filename like ../../../etc/passwd or similar path traversal sequences.
🎯 Impact: Potential arbitrary file write anywhere on the server.
🔧 Fix: Sanitized file.name using path.basename() to extract only the filename component, and reconstructed the target path safely using path.join().
✅ Verification: Verified via pnpm lint, pnpm test, and pnpm build. Added to .jules/sentinel.md journal.

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PR created automatically by Jules for task 4933821125544458522 started by @Cukurikik

Summary by CodeRabbit

• Bug Fixes
  • Improved security for file uploads to prevent potential exploits through crafted filenames. File handling is now more robust with enhanced protection during the upload process.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5d63b7e0-419f-421c-ae98-ae79cf6000da

📥 Commits

Reviewing files that changed from the base of the PR and between 4a0187c and 020d866.

📒 Files selected for processing (2)

• .jules/sentinel.md
• src/app/api/video/[tool]/route.ts

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📝 Walkthrough

Walkthrough

Security documentation and code fix addressing path traversal vulnerability in file uploads. Added vulnerability guidance specifying that user-provided filenames must be sanitized using path.basename() before constructing server-side file paths, and updated the upload handler to implement this sanitization with a fallback filename.

Changes

Cohort / File(s)	Summary
Path Traversal Security Fix .jules/sentinel.md, src/app/api/video/[tool]/route.ts	Added security sentinel documenting the path traversal vulnerability in file uploads and updated the upload handler to sanitize user-controlled filenames using path.basename() instead of relying solely on UUID prefixes. Includes fallback to "unnamed_file" for missing filenames and uses path.join() for safe path construction.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

Poem

Through twisted paths where files take flight,
A rabbit guards with basename() might,
No traversal tricks shall steal the day,
Safe filenames skip and hop their way! 🐰✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: fixing a critical path traversal vulnerability in the Video API. It is specific, concise, and directly summarizes the primary objective of the PR.

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✨ Finishing Touches

📝 Generate docstrings

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• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sentinel-path-traversal-fix-4933821125544458522

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