T09 · Insecure Skill Coding Practices
Warning
- Location
weather_trader_enhanced.py:582- Finding
Bearer Token May Be Disclosed Through Cross-Origin HTTP Redirects in the Trading Client
- Content
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dict: url = f"{SIMMER_API_BASE}{endpoint}" headers = { "Authorization": f"Bearer {api_key}", "Content-Type": "application/json", } try: if method == "GET": req = Request(url, headers=headers) else: body = json.dumps(data).encode() if data else None req = Request(url, data=body, headers=headers, method=method) with urlopen(req, timeout=30) as response: return json.loads(response.read().decode()) except HTTPError as e: error_body = e.read().decode() if e.fp else str(e) return {"error": f"HTTP {e.code}: {error_body}"} except Exception as e: return {"error": str(e)} ``` ### Technical Analysis The initial request destination is constructed from the fixed `https://api.simmer.markets` base URL, which appropriately limits the normal destination of the bearer token. However, `urllib.request.urlopen` automatically processes HTTP redirects through its default redirect handler. The implementation does not validate the scheme and hostname of a redirect before following it, nor does it explicitly strip the `Authorization` header when the destination origin changes. Consequently, a redirect issued by the authenticated API could cause a subsequent request containing `SIMMER_API_KEY` to be sent to another origin. This network access is necessary for the declared trading functionality, but permitting authenticated cross-origin redirects exceeds the minimum privilege needed. The client only needs to authenticate directly to `api.simmer.markets`. ### Attack Path 1. A user supplies a valid `SIMMER_API_KEY` and runs the trading program. 2. The ...[truncated 1267 chars]- Remediation
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