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De acuerdo con el est\u00e1ndar HTTP, Transfer-Encoding debe ser una lista separada por comas, con la codificaci\u00f3n m\u00e1s interna primero, seguida de cualquier otra codificaci\u00f3n de transferencia, que termine en fragmentos. Las peticiones enviadas con: \"Transfer-Encoding: gzip, chunked\" se ignorar\u00edan incorrectamente, y la petici\u00f3n utilizar\u00eda un encabezado Content-Length para determinar el tama\u00f1o del cuerpo del mensaje HTTP. Esto podr\u00eda permitir que Waitress trate una petici\u00f3n \u00fanica como peticiones m\u00faltiples en el caso de la canalizaci\u00f3n HTTP. 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According to the HTTP standard Transfer-Encoding should be a comma separated list, with the inner-most encoding first, followed by any further transfer codings, ending with chunked. Requests sent with: \"Transfer-Encoding: gzip, chunked\" would incorrectly get ignored, and the request would use a Content-Length header instead to determine the body size of the HTTP message. This could allow for Waitress to treat a single request as multiple requests in the case of HTTP pipelining. This issue is fixed in Waitress 1.4.0.", "An HTTP-interpretation flaw was found in waitress which did not properly validate incoming HTTP headers. When parsing the Transfer-Encoding header, waitress would look only for a single string value. According to the HTTP standard, Transfer-Encoding should be a comma-separated list, with the inner-most encoding first, followed by any further transfer codings, ending with 'chunked'. Because of this flaw, requests sent with: \"Transfer-Encoding: gzip, chunked\" would get ignored, and waitress would use the Content-Length header instead to determine the body size of the HTTP message. A remote attacker could exploit this flaw to force waitress to accept potentially bad HTTP requests or treat a single request as multiple requests in the case of HTTP pipelining."], "name": "CVE-2019-16786", "package_state": [{"cpe": "cpe:/a:redhat:ceph_storage:3", "fix_state": "Affected", "impact": "low", "package_name": "python-waitress", "product_name": "Red Hat Ceph Storage 3"}, {"cpe": "cpe:/a:redhat:ceph_storage:4", "fix_state": "Affected", "impact": "low", "package_name": "python-waitress", "product_name": "Red Hat Ceph Storage 4"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Will not fix", "impact": "low", "package_name": "python-waitress", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:16", "fix_state": "Affected", "impact": "low", "package_name": "python-waitress", "product_name": "Red Hat OpenStack Platform 16 (Train)"}], "public_date": "2019-12-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-16786\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-16786\nhttps://docs.pylonsproject.org/projects/waitress/en/latest/#id6"], "statement": "All affected Red Hat products ship but do not use the flawed version of python-waitress. The impact for these products is therefore rated as having a security impact of Low.\nIn Red Hat OpenStack Platform 13,  because the flawed code is not used and the fix would require a substantial amount of development, no update will be provided at this time for the RHOSP13 python-waitress package.", "threat_severity": "Important"}