CVE-2023-41333

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An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.\n"}, {"lang": "es", "value": "Cilium es una soluci\u00f3n de redes, observabilidad y seguridad con un plano de datos basado en eBPF. Un atacante con la capacidad de crear o modificar objetos CiliumNetworkPolicy en un espacio de nombres particular puede afectar el tr\u00e1fico en un cl\u00faster Cilium completo, evitando potencialmente la aplicaci\u00f3n de pol\u00edticas en otros espacios de nombres. Al utilizar un `endpointSelector` manipulado que utiliza el operador `DoesNotExist` en la etiqueta `reserved:init`, el atacante puede crear pol\u00edticas que eludan las restricciones del espacio de nombres y afecten a todo el cl\u00faster de Cilium. Esto incluye potencialmente permitir o denegar todo el tr\u00e1fico. Este ataque requiere acceso al servidor API, como se describe en la secci\u00f3n Atacante del servidor API de Kubernetes del modelo de amenazas de Cilium. Este problema se resolvi\u00f3 en las versiones 1.14.2, 1.13.7 y 1.12.14 de Cilium. Como workaround, se puede utilizar un webhook de admisi\u00f3n para evitar el uso de `endpointSelectors` que utilizan el operador `DoesNotExist` en la etiqueta `reserved:init` en CiliumNetworkPolicies."}], "id": "CVE-2023-41333", "lastModified": "2026-06-17T06:21:50.350", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.7, "impactScore": 4.7, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.7, "impactScore": 5.8, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-41333", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-23T20:31:48.503484Z", "version": "2.0.3"}}]}, "published": "2023-09-27T15:19:30.163", "references": [{"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://docs.cilium.io/en/stable/security/threat-model/#kubernetes-api-server-attacker"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/cilium/cilium/pull/28007"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Patch", "Third Party Advisory"], "url": "https://github.com/cilium/cilium/security/advisories/GHSA-4xp2-w642-7mcx"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Product"], "url": "https://docs.cilium.io/en/stable/security/threat-model/#kubernetes-api-server-attacker"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/cilium/cilium/pull/28007"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mitigation", "Patch", "Third Party Advisory"], "url": "https://github.com/cilium/cilium/security/advisories/GHSA-4xp2-w642-7mcx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-306"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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