🛡️ Sentinel: [CRITICAL] Fix Path Traversal Detection

[seonghobae]

🚨 Severity: CRITICAL
💡 Vulnerability: The VibeSec static analysis scanner lacked explicit detection for path traversal risks caused by dynamically constructing file paths using untrusted inputs (e.g., Python open(f"...{var}...") or Node fs.readFile(\...${var}...`)). 🎯 Impact: Path Traversal (OWASP A01:2021) allows an attacker to read arbitrary files from the filesystem. 🔧 Fix: A new rule path-traversal-riskwas added toSCAN_RULESto flag unsafe usage offs.readFile, fs.readFileSync, fs.writeFile, fs.writeFileSync, fs.createReadStream, and Python's open()` when used with string concatenation, f-strings, or template literals.
✅ Verification: Ensure the test suite passes, and run the scanner over a file with a dynamic path using an f-string or template literal.

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PR created automatically by Jules for task 2040610633313325460 started by @seonghobae

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[github-actions]

OpenCode Review Overview

• Head SHA: 0cc32ffaa19e4ed8b25d998409c7bb3399568b78

• Workflow run: 27873165502

• Workflow attempt: 1

• Gate result: APPROVE (exit 0)

29. But note: the first line must be exactly the sentinel, then the control block.

30. We output:

<!-- opencode-review-gate head_sha=0cc32ffaa19e4ed8b25d998409c7bb3399568b78 run_id=27873165502 run_attempt=1 -->
<!-- opencode-review-control-v1
{
    "head_sha": "0cc32ffaa19e4ed8b25d998409c7bb3399568b78",
    "run_id": "27873165502",
    "run_attempt": "1",
    "result": "APPROVE",
    "reason": "New rule for path traversal risks is a valuable addition and is implemented consistently with existing rules. The sentinel log is updated appropriately.",
    "summary": "Approved: added a new rule for path traversal risks in the scanner.",
    "findings": []
}
-->

31. However, note that the reason and summary are short and concrete.

32. We are done.

[opencode-agent]

OpenCode Agent approved this PR.

PR adds valuable path traversal rule to scanner with correct OWASP classification and consistent implementation. No regressions found in rule pattern or implementation.

• Result: APPROVE
• Reason: Security enhancement adds path traversal detection with proper OWASP mapping
• Head SHA: 0cc32ffaa19e4ed8b25d998409c7bb3399568b78
• Workflow run: 27873165502
• Workflow attempt: 1