CVE-2021-21295

{"id": "CVE-2021-21295", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 2.6, "accessVector": "NETWORK", "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "HIGH", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "LOW", "obtainAllPrivilege": false, "exploitabilityScore": 4.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.2}, {"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.2}]}, "published": "2021-03-09T19:15:12.657", "references": [{"url": "https://github.com/Netflix/zuul/pull/980", "tags": ["Patch", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/netty/netty/commit/89c241e3b1795ff257af4ad6eadc616cb2fb3dc4", "tags": ["Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": 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framework for rapid development of maintainable high performance protocol servers & clients. In Netty (io.netty:netty-codec-http2) before version 4.1.60.Final there is a vulnerability that enables request smuggling. If a Content-Length header is present in the original HTTP/2 request, the field is not validated by `Http2MultiplexHandler` as it is propagated up. This is fine as long as the request is not proxied through as HTTP/1.1. If the request comes in as an HTTP/2 stream, gets converted into the HTTP/1.1 domain objects (`HttpRequest`, `HttpContent`, etc.) via `Http2StreamFrameToHttpObjectCodec `and then sent up to the child channel's pipeline and proxied through a remote peer as HTTP/1.1 this may result in request smuggling. In a proxy case, users may assume the content-length is validated somehow, which is not the case. If the request is forwarded to a backend channel that is a HTTP/1.1 connection, the Content-Length now has meaning and needs to be checked. An attacker can smuggle requests inside the body as it gets downgraded from HTTP/2 to HTTP/1.1. For an example attack refer to the linked GitHub Advisory. Users are only affected if all of this is true: `HTTP2MultiplexCodec` or `Http2FrameCodec` is used, `Http2StreamFrameToHttpObjectCodec` is used to convert to HTTP/1.1 objects, and these HTTP/1.1 objects are forwarded to another remote peer. This has been patched in 4.1.60.Final As a workaround, the user can do the validation by themselves by implementing a custom `ChannelInboundHandler` that is put in the `ChannelPipeline` behind `Http2StreamFrameToHttpObjectCodec`."}, {"lang": "es", "value": "Netty es un framework de aplicaci\u00f3n de red de c\u00f3digo abierto y controlado por eventos as\u00edncronos para el desarrollo r\u00e1pido de servidores y clientes de protocolo de alto rendimiento mantenibles. En Netty (io.netty: netty-codec-http2) versiones anteriores a la versi\u00f3n 4.1.60.Final, se presenta una vulnerabilidad que permite el tr\u00e1fico de peticiones. Si existe un encabezado Content-Length en la petici\u00f3n HTTP/2 original, el campo no es comprobado por \"Http2MultiplexHandler\" a medida que se propaga. Esto est\u00e1 bien siempre que la petici\u00f3n no se transmita como HTTP/1.1. Si la petici\u00f3n llega como una secuencia HTTP/2, se convierte en los objetos de dominio HTTP/1.1 (\"HttpRequest\", \"HttpContent\", etc.) por medio de \"Http2StreamFrameToHttpObjectCodec\" y luego se env\u00eda al pipeline del canal secundario y al proxy mediante un peer remoto como HTTP/1.1, esto puede resultar en el tr\u00e1fico de peticiones. En un caso de proxy, los usuarios pueden asumir que la longitud del contenido est\u00e1 comprobada de alguna forma, lo que no es el caso. Si la petici\u00f3n se reenv\u00eda a un canal de backend que es una conexi\u00f3n HTTP/1.1, la longitud del contenido ahora tiene significado y debe verificarse. Un atacante puede traficar peticiones dentro del cuerpo a medida que se degrada de HTTP/2 a HTTP/1.1. Para visualizar un ejemplo de ataque, consulte el Aviso de GitHub vinculado. Los usuarios solo est\u00e1n afectados si todo esto es cierto: se usa \"HTTP2MultiplexCodec\" o \"Http2FrameCodec\", se usa \"Http2StreamFrameToHttpObjectCodec\" para convertir a objetos HTTP/1.1, y estos objetos HTTP/1.1 se reenv\u00edan a otro par remoto. Esto ha sido parcheado en la versi\u00f3n 4.1.60.Final. Como soluci\u00f3n, el usuario puede hacer la comprobaci\u00f3n por s\u00ed mismo implementando un \"ChannelInboundHandler\" personalizado que se coloca en el \"ChannelPipeline\" detr\u00e1s de \"Http2StreamFrameToHttpObjectCodec\""}], "lastModified": "2023-11-07T03:29:44.303", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "635A35A3-F02B-44CC-BB81-48C97F1612B1", "versionEndExcluding": "4.1.60"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:netapp:oncommand_api_services:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5EC98B22-FFAA-4B59-8E63-EBAA4336AD13"}, {"criteria": "cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5735E553-9731-4AAC-BCFF-989377F817B3"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:quarkus:quarkus:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "64839EBF-078E-492A-897C-9AFFB7678ED8", "versionEndIncluding": "1.13.7"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:apache:kudu:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A868228B-8AA3-4A4D-B3B4-9344854B94F2", "versionEndExcluding": "1.16.0"}, {"criteria": "cpe:2.3:a:apache:zookeeper:3.5.9:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C6D906AE-B5F6-4CD6-8018-F6FFF7A49913"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4479F76A-4B67-41CC-98C7-C76B81050F8E"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}