barwalgayatri02/MCPServer_WebScrapping
highCreation of MCPServer Web scrapping project
MCP server (purpose undetermined)
64async def fetch_url(url: str):
65 async with httpx.AsyncClient() as client:
66 response = await client.get(url, timeout=30.0)
67 ...
68 return cleaned_response// Exploitable if MCP is exposed to untrusted prompts or if an attacker can influence search results (e.g., via SEO poisoning).
The fetch_url function accepts a URL directly from search results without any validation or sanitization. An attacker could craft a search result that points to an internal service (e.g., http://169.254.169.254/latest/meta-data/) or a malicious external site, leading to Server-Side Request Forgery (SSRF).
ImpactAn attacker could use this tool to scan internal networks, access cloud metadata endpoints, or exfiltrate data to an attacker-controlled server.
FixValidate the URL against an allowlist of expected domains (e.g., only allow URLs from the docs_urls mapping). Use a URL parser to reject IP addresses, private ranges, and non-HTTP schemes.
124@mcp.tool()
125async def get_docs(query: str, library: str):
126 if library not in docs_urls:
127 raise ValueError(f"Library {library} not supported by this tool")
128 query = f"site:{docs_urls[library]} {query}"// Exploitable if MCP is exposed to untrusted prompts.
The library parameter is only checked against a predefined dictionary, but the query parameter is not sanitized. An attacker could inject special characters or additional search operators into the query, potentially manipulating the search API call.
ImpactAn attacker could craft a query that bypasses the site restriction or injects malicious payloads into the search request, though the impact is limited by the Serper API's own restrictions.
FixSanitize the query input to remove or escape special characters. Consider using a parameterized approach or encoding the query.
43headers = {
44 'X-API-KEY': os.getenv("SERPER_API_KEY"),
45 'Content-Type': 'application/json'
46}// Local-only MCP, requires compromised LLM or host access to exploit.
The SERPER_API_KEY is loaded from environment variables and used directly. If the key is missing or invalid, the error may leak information. Additionally, the key could be exposed if the server is compromised or logs are mishandled.
ImpactAn attacker with access to the server's environment or logs could obtain the API key and use it to make unauthorized requests to the Serper API.
FixEnsure the API key is stored securely (e.g., using a secrets manager) and validate its presence before use. Avoid logging the key.