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HTTP/1.1 es un protocolo persistente, si los valores de encabezado Content-Length (CL) y Transfer-Encoding (TE) est\u00e1n presentes, puede llevar a una interpretaci\u00f3n incorrecta de dos entidades que analizan HTTP y podemos envenenar otros sockets con esta interpretaci\u00f3n incorrecta. Una posible Proof-of-Concept (POC) ser\u00eda una configuraci\u00f3n con un proxy inverso (frontend) que acepte encabezados CL y TE y aiohttp como backend. Como aiohttp analiza cualquier cosa con fragmentos, podemos pasar un fragmento123 como TE, la entidad de interfaz ignorar\u00e1 este encabezado y analizar\u00e1 la longitud del contenido. El impacto de esta vulnerabilidad es que es posible eludir cualquier regla de proxy, envenenando los sockets de otros usuarios, como pasar encabezados de autenticaci\u00f3n. Adem\u00e1s, si est\u00e1 presente un redireccionamiento abierto, un atacante podr\u00eda combinarlo para redirigir a usuarios aleatorios a otro sitio web y registrar la solicitud. Esta vulnerabilidad se solucion\u00f3 en la versi\u00f3n 3.8.0 de aiohttp. Se recomienda a los usuarios que actualicen. 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{"bugzilla": {"description": "python-aiohttp: inconsistent interpretation of `Content-Length` vs. `Transfer-Encoding`", "id": "2250179", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2250179"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-444", "details": ["aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Affected versions of aiohttp have a security vulnerability regarding the inconsistent interpretation of the http protocol. HTTP/1.1 is a persistent protocol, if both Content-Length(CL) and Transfer-Encoding(TE) header values are present it can lead to incorrect interpretation of two entities that parse the HTTP and we can poison other sockets with this incorrect interpretation. A possible Proof-of-Concept (POC) would be a configuration with a reverse proxy(frontend) that accepts both CL and TE headers and aiohttp as backend. As aiohttp parses anything with chunked, we can pass a chunked123 as TE, the frontend entity will ignore this header and will parse Content-Length. The impact of this vulnerability is that it is possible to bypass any proxy rule, poisoning sockets to other users like passing Authentication Headers, also if it is present an Open Redirect an attacker could combine it to redirect random users to another website and log the request. This vulnerability has been addressed in release 3.8.0 of aiohttp. Users are advised to upgrade. There are no known workarounds for this vulnerability.", "Aiohttp is susceptible to an HTTP request smuggling vulnerability due to inadequate parsing of the HTTP Content-Length (CL) and Transfer-Encoding (TE) headers. This flaw allows an attacker to bypass proxy rules, poisoning sockets to other users, such as passing Authentication Headers. Additionally, if an open redirect is present, the attacker can leverage it to redirect random users to their website and log the requests."], "name": "CVE-2023-47641", "package_state": [{"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "python3x-aiohttp", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "python-aiohttp", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "python-aiohttp", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:rhui:4::el8", "fix_state": "Not affected", "package_name": "python-aiohttp", "product_name": "Red Hat Update Infrastructure 4 for Cloud Providers"}], "public_date": "2023-11-14T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-47641\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-47641\nhttps://github.com/aio-libs/aiohttp/commit/f016f0680e4ace6742b03a70cb0382ce86abe371\nhttps://github.com/aio-libs/aiohttp/security/advisories/GHSA-xx9p-xxvh-7g8j"], "statement": "In order for actual exploitation of this flaw an open redirect flaw would have to be present to chain this, that is why Redhat has marked this vulnerability's attack complexity as high and since open redirect would need user interaction for exploitation CVSS for it has been marked as such.", "threat_severity": "Low"}

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