CVE-2022-24761

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There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. 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Se presentan dos clases de vulnerabilidad que pueden conllevar a un contrabando de peticiones que son abordadas en este aviso: El uso de \"int()`\"de Python para analizar cadenas en enteros, conllevando a que \"+10\" sea analizado como \"10\", o que \"0x01\" sea analizado como \"1\", cuando el est\u00e1ndar especifica que la cadena debe contener s\u00f3lo d\u00edgitos o d\u00edgitos hexadecimales; y que Waitress no soporta extensiones de chunk, sin embargo las estaba descartando sin comprender que no conten\u00edan caracteres ilegales. Esta vulnerabilidad ha sido parcheada en Waitress versi\u00f3n 2.1.1. Se presenta una medida de mitigaci\u00f3n disponible. Cuando despliegue un proxy frente a Waitress, habilite todas las funciones para asegurarse de que la petici\u00f3n es ajustada al est\u00e1ndar RFC7230. Sin embargo, algunos servidores proxy pueden no tener esta funcionalidad y es recomendado a usuarios actualizar a la \u00faltima versi\u00f3n de waitress en su lugar"}], "id": "CVE-2022-24761", "lastModified": "2026-06-17T04:32:27.557", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-24761", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-04-23T15:56:44.133820Z", "version": "2.0.3"}}]}, "published": "2022-03-17T13:15:07.647", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Release Notes", "Third Party Advisory"], "url": "https://github.com/Pylons/waitress/commit/9e0b8c801e4d505c2ffc91b891af4ba48af715e0"}, {"source": "security-advisories@github.com", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/Pylons/waitress/releases/tag/v2.1.1"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-4f7p-27jc-3c36"}, {"source": "security-advisories@github.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2022/dsa-5138"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Release Notes", "Third Party Advisory"], "url": "https://github.com/Pylons/waitress/commit/9e0b8c801e4d505c2ffc91b891af4ba48af715e0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/Pylons/waitress/releases/tag/v2.1.1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-4f7p-27jc-3c36"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2022/dsa-5138"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-444"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2022:1264", "cpe": "cpe:/a:redhat:openstack:13::el7", "package": "python-waitress-0:1.4.4-2.el7ost", "product_name": "Red Hat OpenStack Platform 13.0 - ELS", "release_date": "2022-04-07T00:00:00Z"}, {"advisory": "RHSA-2022:1254", "cpe": "cpe:/a:redhat:openstack:16.1::el8", "package": "python-waitress-0:2.0.0-1.el8ost", "product_name": "Red Hat OpenStack Platform 16.1", "release_date": "2022-04-06T00:00:00Z"}, {"advisory": "RHSA-2022:1253", "cpe": "cpe:/a:redhat:openstack:16.2::el8", "package": "python-waitress-0:2.0.0-1.el8ost", "product_name": "Red Hat OpenStack Platform 16.2", "release_date": "2022-04-06T00:00:00Z"}], "bugzilla": {"description": "waitress: Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')", "id": "2065086", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2065086"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "status": "verified"}, "cwe": "CWE-444", "details": ["Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.", "An Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling) flaw was found in Waitress when used behind a proxy that does not properly validate the incoming HTTP request. This flaw allows an attacker to smuggle requests via the front-end proxy to Waitress, resulting in a loss of data integrity."], "name": "CVE-2022-24761", "package_state": [{"cpe": "cpe:/a:redhat:ceph_storage:3", "fix_state": "Out of support scope", "package_name": "python-waitress", "product_name": "Red Hat Ceph Storage 3"}, {"cpe": "cpe:/a:redhat:ceph_storage:4", "fix_state": "Not affected", "package_name": "python-waitress", "product_name": "Red Hat Ceph Storage 4"}, {"cpe": "cpe:/a:redhat:ceph_storage:5", "fix_state": "Not affected", "package_name": "python-waitress", "product_name": "Red Hat Ceph Storage 5"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Not affected", "package_name": "python-waitress", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}], "public_date": "2022-03-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-24761\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-24761\nhttps://github.com/Pylons/waitress/security/advisories/GHSA-4f7p-27jc-3c36"], "threat_severity": "Important"}

{}