T08 · Insecure Dependencies
- Location
scripts/build_podcast_assets.py:25- Finding
Unpinned External Script Receives the Complete Process Environment
- Content
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Vulnerability Details
File Location:
scripts/build_podcast_assets.py, lines 25–34 and 115–133
Vulnerability Type: Untrusted external executable dependency with excessive environment inheritance
Risk Level: MediumVulnerable Code
python SKILL_DIR = Path(__file__).resolve().parents[1] WORKSPACE_DIR = SKILL_DIR.parents[1] # Prefer explicit env override, then common local defaults. QUARTZ_ROOT = Path( os.environ.get( 'QUARTZ_ROOT', '/home/tw2/Documents/n8n/data/shared/syn/8.quartz', ) ) NANO_SCRIPT = WORKSPACE_DIR / 'skills/nano-banana-pro/scripts/generate_image.py' FONT_BOLD = WORKSPACE_DIR / 'skills/youtube-editor/assets/fonts/Paperlogy-ExtraBold.ttf' TG_MAX_BYTES = 20 * 1024 * 1024python def generate_bg_with_skill(prompt: str, out_path: Path, resolution: str = '1K'): api_key = os.environ.get('GEMINI_API_KEY') or os.environ.get('NANO_BANANA_KEY') if not api_key: raise RuntimeError('Set GEMINI_API_KEY or NANO_BANANA_KEY') if not NANO_SCRIPT.exists(): raise FileNotFoundError(f'NANO script missing: {NANO_SCRIPT}') # Security hardening: provide API key via environment, not CLI args # (prevents exposure via process listings). env = os.environ.copy() env['GEMINI_API_KEY'] = api_key cmd = [ 'uv', 'run', str(NANO_SCRIPT), '--prompt', prompt, '--filename', str(out_path), '--resolution', resolution, ] subprocess.run(cmd, check=True, env=env, timeout=600)Technical Analysis
Thumbnail generation delegates execution to
skills/nano-banana-pro/scripts/generate_image.py, which is outside this project and was therefore not included in the audited code. The dependency is not version-pinned, bundled, or checked against an expected cryptographic hash before execution.The child process receives a copy of the entire parent environment through
os.environ.copy(). This includes the explicitly insertedGEMINI_API_KEYand ma ...[truncated 1900 chars]- Remediation
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Remediation Suggestions
-
Establish dependency integrity
- Bundle the required generator into the reviewed project, or use a versioned package from a trusted registry.
- Pin the dependency to an immutable version or commit.
- Verify the script or package against an expected SHA-256 digest or signed release before execution.
-
Use a minimal environment
- Replace
os.environ.copy()with an explicit allowlist containing only variables required byuv, Python, and the image generator. - Do not forward unrelated credentials or configuration.
- Supply only one intended API-key variable and remove the alias when it is unnecessary.
Example:
python env = { "PATH": os.environ.get("PATH", ""), "HOME": os.environ.get("HOME", ""), "GEMINI_API_KEY": api_key, } - Replace
-
Constrain execution
- Run the image generator in a sandbox or container with restricted filesystem and network access.
- Use a dedicated low-privilege account.
- Limit writable directories to the intended output directory.
-
Validate the dependency path
- Resolve the path and ensure it is an expected regular file.
- Reject symbolic links and unexpected ownership or writable permissions where practical.
- Fail closed if integrity verification does not succeed.
-
Document the trust boundary
- State clearly that thumbnail generation executes an external sibling Skill not included in this repository.
- Include that component in future audits before treating the complete workflow as trusted.
-