T09 · Insecure Skill Coding Practices
- Location
scripts/blinko_client.py:11- Finding
Bearer Token and Sensitive Note Data May Be Exposed Through Insecure Transport and Command-Line Arguments
- Content
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Vulnerability Details
File Location:
scripts/blinko_client.py:11-25,scripts/blinko_client.py:105-106, andscripts/blinko_client.py:152
Vulnerability Type: Plaintext transmission of sensitive data and insecure command-line secret handling
Risk Level: MediumVulnerable Code
python class Blinko: def __init__(self, base_url=None, api_token=None): host = base_url if base_url is not None else os.getenv("BLINKO_HOST", "http://127.0.0.1:1111") token = api_token if api_token is not None else os.getenv("BLINKO_TOKEN", "") self.base_url = (host or "").rstrip("/") self.api_token = token or "" def _headers(self): headers = {"Content-Type": "application/json"} if self.api_token: headers["Authorization"] = f"Bearer {self.api_token}" return headers def _request(self, path, method="GET", body=None): url = f"{self.base_url}{path}" data = None if body is not None: data = json.dumps(body).encode("utf-8") request = urllib.request.Request(url, data=data, headers=self._headers(), method=method)python parser.add_argument("--host", default=os.getenv("BLINKO_HOST", "http://127.0.0.1:1111"), help="Blinko host") parser.add_argument("--token", default=os.getenv("BLINKO_TOKEN", ""), help="Blinko API token")python client = Blinko(base_url=args.host, api_token=args.token)Technical Analysis
The client accepts an unrestricted API base URL and does not validate its scheme or destination before attaching the Blinko bearer token. Although the default endpoint is a loopback HTTP address, users may configure
BLINKO_HOSTor--hostwith a non-loopbackhttp://endpoint. In that case, theAuthorizationheader and request bodies containing private note data are transmitted without transport encryption.Authentication and transmission of note conte ...[truncated 2330 chars]
- Remediation
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Remediation Suggestions
- Parse and validate the configured host before constructing requests.
- Require
https://for every non-loopback destination. - Permit
http://only for explicit loopback addresses such as127.0.0.1,::1, or a carefully validated local development configuration. - Reject unsupported URL schemes, missing hostnames, embedded credentials, and malformed endpoints.
- Remove the
--tokencommand-line option to prevent routine exposure through process listings and shell history. - Prefer
BLINKO_TOKENor a dedicated credential store. If interactive use is needed, read the token through a non-echoing prompt or protected file descriptor. - Document that environment variables can still be visible under some local privilege models and recommend short-lived, narrowly scoped API tokens.
- Ensure authorization credentials are not forwarded to a different origin during redirects; reject cross-origin redirects or strip the
Authorizationheader before following them. - Apply least privilege on the server by issuing tokens restricted to only the Blinko operations required by the user.
- Add tests confirming that remote HTTP endpoints are rejected, loopback development behavior is explicit, and credentials never appear in normal logs or error output.