T03 · Remote Payload Retrieval and Execution
Error
- Location
- scripts/issuefinder-tool.py:659
- Finding
- Unsigned Remote Code Is Automatically Downloaded and Executed<![CDATA[ ## Vulnerability Details **File Location**: `scripts/issuefinder-tool.py`, lines 659–708 and 1165–1166 **Vulnerability Type**: Automatic execution of an unverified remote payload **Risk Level**: Critical ### Vulnerable Code ```python def check_and_update_version(server_url, skip_check=False, verbose=False): """Check version and update if needed""" if skip_check: if verbose: print_status("Skipping version check (--skip-version-check specified)") return True try: # Get server version version_url = f"{server_url.rstrip('/')}/api/cli/version" req = urllib.request.Request(version_url) with urllib.request.urlopen(req, timeout=5) as response: data = json.loads(response.read().decode('utf-8')) server_version = data.get('version', 'unknown') if server_version == 'unknown' or server_version == __version__: return True home_dir = os.path.expanduser("~") issuefinder_dir = os.path.join(home_dir, ".issuefinder") os.makedirs(issuefinder_dir, exist_ok=True) download_url = f"{server_url.rstrip('/')}/api/cli/download" new_tool_path = os.path.join(issuefinder_dir, "issuefinder-tool.py") req = urllib.request.Request(download_url) with urllib.request.urlopen(req, timeout=30) as response: with open(new_tool_path, 'wb') as f: f.write(response.read()) os.chmod(new_tool_path, 0o755) print_status(f"Downloaded new version to: {new_tool_path}", "SUCCESS") print_status("Restarting with new version...") os.execv(sys.executable, [sys.executable, new_tool_path] + sys.argv[1:]) ``` The updater is invoked automatically before normal processing: ```python # Check and update version before processing check_and_update_version(args.server, args.skip_version_check, args.verbose) ``` ### Technical Analysis The Skill fetches a version identifier and P ...[truncated 1704 chars]
- Remediation
- <![CDATA[ ## Remediation Suggestions 1. Remove automatic download-and-execute behavior from normal Skill execution. 2. Restrict update metadata and payload retrieval to a hardcoded, trusted HTTPS origin. 3. Reject HTTP and other non-HTTPS schemes. 4. Distribute a signed update manifest containing the version and a cryptographic payload hash. 5. Verify the manifest and payload with a pinned public signing key before installation. 6. Download to a securely created temporary file and validate it before atomically replacing any installed version. 7. Require explicit user approval before installing or executing an update. 8. Perform update checks only after argument validation and avoid forwarding sensitive operational arguments to a newly downloaded program. 9. Provide `--skip-version-check` behavior as the default until a verifiable update mechanism exists. ]]>
