T08 · Insecure Dependencies
Warning
- Location
english_checkin.py:68- Finding
Unpinned and Unverified External Python Dependency Is Executed
- Content
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Vulnerability Details
File Location:
english_checkin.py:68-75, 95-105, 115-159;SKILL.md:27-31
Vulnerability Type: Unverified third-party dependency execution
Risk Level: MediumVulnerable Code
The dependency path can be supplied through an environment variable or command-line argument, with existence being the only validation:
python def parse_global_args(): """Parse global arguments.""" global _LEARNING_CHECKIN_PATH # Prefer the environment variable env_path = os.environ.get("LEARNING_CHECKIN_PATH") if env_path: script_path = Path(env_path) if script_path.exists(): _LEARNING_CHECKIN_PATH = script_path return # Read from the command-line argument new_argv = [] i = 1 while i < len(sys.argv): arg = sys.argv[i] if arg == "--learning-checkin-path" and i + 1 < len(sys.argv): script_path = Path(sys.argv[i + 1]) if script_path.exists(): _LEARNING_CHECKIN_PATH = script_path i += 2 else: new_argv.append(arg) i += 1The selected file is subsequently executed as Python code:
python def init_learning_checkin(): """Initialize learning-checkin.""" script_path = get_learning_checkin_script() if not script_path or not script_path.exists(): return None, "learning-checkin is not installed" try: result = subprocess.run( [sys.executable, str(script_path), "init"], capture_output=True, text=True, encoding='utf-8', timeout=30 )python def run_learning_checkin_command(command): """Run a learning-checkin command.""" script_path = get_learning_checkin_script() if not script_path or not script_path.exists(): return None, " ...[truncated 3183 chars]- Remediation
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Remediation Suggestions
- Pin the dependency to a specific, audited, immutable release rather than directing users to an unversioned external artifact.
- Publish an expected SHA-256 digest or a verifiable digital signature and validate it before every execution. Fail closed when verification cannot be completed.
- Resolve the configured path with
Path.resolve()and enforce an allowlisted dependency directory. Reject paths outside that directory. - Require the target to be a regular file and, where supported, reject symbolic links, unsafe ownership, and files writable by untrusted users.
- Prefer importing a versioned package through a locked dependency mechanism with hash verification, such as a lockfile and hash-pinned installation.
- Execute the dependency with least privilege in a restricted environment. Remove unnecessary environment variables and limit filesystem and network access where platform controls permit.
- Display the resolved dependency path, validated version, and digest in the
checkcommand so users can confirm exactly which artifact will execute. - Document a trusted installation and update process, including how releases are authenticated and how compromised versions are revoked.