CVE-2023-33953

{"id": "CVE-2023-33953", "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "cve-coordination@google.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2023-08-09T13:15:09.370", "references": [{"url": "https://cloud.google.com/support/bulletins#gcp-2023-022", "tags": ["Vendor Advisory"], "source": "cve-coordination@google.com"}, {"url": "https://cloud.google.com/support/bulletins#gcp-2023-022", "tags": ["Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "cve-coordination@google.com", "description": [{"lang": "en", "value": "CWE-789"}, {"lang": "en", "value": "CWE-834"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-770"}, {"lang": "en", "value": "CWE-834"}]}], "descriptions": [{"lang": "en", "value": "gRPC contains a vulnerability that allows hpack table accounting errors could lead to unwanted disconnects between clients and servers in exceptional cases/\u00a0Three vectors were found that allow the following DOS attacks:\n\n- Unbounded memory buffering in the HPACK parser\n- Unbounded CPU consumption in the HPACK parser\n\nThe unbounded CPU consumption is down to a copy that occurred per-input-block in the parser, and because that could be unbounded due to the memory copy bug we end up with an O(n^2) parsing loop, with n selected by the client.\n\nThe unbounded memory buffering bugs:\n\n- The header size limit check was behind the string reading code, so we needed to first buffer up to a 4 gigabyte string before rejecting it as longer than 8 or 16kb.\n- HPACK varints have an encoding quirk whereby an infinite number of 0\u2019s can be added at the start of an integer. gRPC\u2019s hpack parser needed to read all of them before concluding a parse.\n- gRPC\u2019s metadata overflow check was performed per frame, so that the following sequence of frames could cause infinite buffering: HEADERS: containing a: 1 CONTINUATION: containing a: 2 CONTINUATION: containing a: 3 etc\u2026"}, {"lang": "es", "value": "gRPC contiene una vulnerabilidad que permite que los errores de contabilidad de la tabla hpack puedan provocar desconexiones no deseadas entre clientes y servidores en casos excepcionales/ Se han encontrado tres vectores que permiten los siguientes ataques DOS:\n\n- Memoria intermedia ilimitada en el analizador sint\u00e1ctico HPACK\n- Consumo ilimitado de CPU en el analizador sint\u00e1ctico HPACK\n\nEl consumo ilimitado de CPU se debe a una copia que se produc\u00eda por bloque de entrada en el analizador sint\u00e1ctico, y dado que podr\u00eda ser ilimitada debido al error de copia de memoria, acabamos con un bucle de an\u00e1lisis sint\u00e1ctico O(n^2), con n seleccionado por el cliente.\n\nEl error de memoria intermedia no limitada:\n\n- La comprobaci\u00f3n del l\u00edmite de tama\u00f1o de la cabecera estaba detr\u00e1s del c\u00f3digo de lectura de cadenas, por lo que necesit\u00e1bamos primero almacenar en b\u00fafer hasta una cadena de 4 gigabytes antes de rechazarla como m\u00e1s larga de 8 o 16kb.\n- Las varints HPACK tienen una peculiaridad de codificaci\u00f3n por la que se puede a\u00f1adir un n\u00famero infinito de ceros al principio de un entero. El analizador hpack de gRPC necesitaba leerlos todos antes de concluir el an\u00e1lisis.\n- La comprobaci\u00f3n de desbordamiento de metadatos de gRPC se realizaba por fotograma, por lo que la siguiente secuencia de fotogramas pod\u00eda causar un buffering infinito: CABECERAS: contiene un: 1 CONTINUACI\u00d3N: contiene un: 2 CONTINUACI\u00d3N: contiene un: 3 etc?"}], "lastModified": "2024-11-21T08:06:17.007", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:grpc:grpc:*:*:*:*:*:-:*:*", "vulnerable": true, "matchCriteriaId": "5278AD31-21EB-4A2E-89FE-D2E765AC4507", "versionEndExcluding": "1.53.2"}, {"criteria": "cpe:2.3:a:grpc:grpc:*:*:*:*:*:-:*:*", "vulnerable": true, "matchCriteriaId": "1A6B7840-8878-4F83-977A-1AF53E103F51", "versionEndExcluding": "1.54.3", "versionStartIncluding": "1.54.0"}, {"criteria": "cpe:2.3:a:grpc:grpc:*:*:*:*:*:-:*:*", "vulnerable": true, "matchCriteriaId": "12899AA9-F4C9-4E74-B423-8AD74F043758", "versionEndExcluding": "1.55.2", "versionStartIncluding": "1.55.0"}, {"criteria": "cpe:2.3:a:grpc:grpc:*:*:*:*:*:-:*:*", "vulnerable": true, "matchCriteriaId": "C4864589-BDBC-4F3D-9175-DA7800480B87", "versionEndExcluding": "1.56.2", "versionStartIncluding": "1.56.0"}], "operator": "OR"}]}], "sourceIdentifier": "cve-coordination@google.com"}