T09 · Insecure Skill Coding Practices
- Location
scripts/selection.py:576- Finding
User-Controlled Output Path Traversal
- Content
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Vulnerability Details
File Location:
scripts/selection.py:576-581andscripts/selection.py:614-619
Vulnerability Type: Path traversal and uncontrolled file creation
Risk Level: MediumVulnerable Code
python timestamp = datetime.now().strftime("%Y%m%d-%H%M%S") filename = f"output/alphashop-sel-newproduct/keywords-{args.keyword.replace(' ', '-')}-{args.region}-{timestamp}.json" import os os.makedirs(os.path.dirname(filename), exist_ok=True) with open(filename, "w", encoding="utf-8") as f: json.dump(result, f, ensure_ascii=False, indent=2)The report command contains the same weakness:
python timestamp = datetime.now().strftime("%Y%m%d-%H%M%S") filename = f"output/alphashop-sel-newproduct/report-{args.keyword.replace(' ', '-')}-{args.country}-{timestamp}.json" import os os.makedirs(os.path.dirname(filename), exist_ok=True) with open(filename, "w", encoding="utf-8") as f: json.dump(result, f, ensure_ascii=False, indent=2)Technical Analysis
The user-controlled
keywordargument is incorporated directly into a filesystem path. Replacing spaces with hyphens does not remove path separators,..components, absolute-path syntax, or other filesystem metacharacters.Both
os.makedirs()andopen(..., "w")operate on the resulting unverified path. Consequently, a keyword containing traversal components can escapeoutput/alphashop-sel-newproduct. The generated timestamp makes exact replacement of a pre-existing file less practical, but it does not prevent directory traversal, creation of new files in unintended writable directories, or disclosure of API response data through an attacker-selected location.Attack Path
- An attacker or untrusted caller supplies a keyword containing traversal components, such as multiple
../segments. - The keyword is sent to the fixed AlphaShop API as part of an otherwise legitimate request.
- If the API accepts ...[truncated 1133 chars]
- An attacker or untrusted caller supplies a keyword containing traversal components, such as multiple
- Remediation
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Remediation Suggestions
- Do not use raw user input as part of a filesystem path.
- Convert keywords to a strict filename-safe identifier using an allowlist such as
[A-Za-z0-9._-]. - Explicitly reject
/,\, null bytes, absolute paths, and..path components. - Prefer a generated identifier, UUID, or cryptographic digest instead of the original keyword.
- Resolve both the base directory and candidate output path with
pathlib.Path.resolve(), then verify that the candidate remains beneath the intended base directory before creating it. - Apply the same centralized safe-path function to both the
searchandreportcommands. - Create output files with restrictive permissions if responses may contain commercially sensitive information.
Example containment check:
python from pathlib import Path import re output_root = Path("output/alphashop-sel-newproduct").resolve() safe_keyword = re.sub(r"[^A-Za-z0-9._-]+", "-", args.keyword).strip(".-") safe_keyword = safe_keyword or "keyword" candidate = ( output_root / f"keywords-{safe_keyword}-{args.region}-{timestamp}.json" ).resolve() if output_root not in candidate.parents: raise ValueError("Invalid output path") output_root.mkdir(parents=True, exist_ok=True) with candidate.open("x", encoding="utf-8") as f: json.dump(result, f, ensure_ascii=False, indent=2)
