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A user could detect whether a bypass occurred if they have Envoy logs enabled with debug verbosity. Users can enable component level debug logs for JWT. 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{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:envoyproxy:envoy:1.17.0:*:*:*:*:*:*:*", "matchCriteriaId": "E426CE56-9EB3-4641-B9A0-2E418FD3478F", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "Envoy is a cloud-native high-performance edge/middle/service proxy. In Envoy version 1.17.0 an attacker can bypass authentication by presenting a JWT token with an issuer that is not in the provider list when Envoy's JWT Authentication filter is configured with the `allow_missing` requirement under `requires_any` due to a mistake in implementation. Envoy's JWT Authentication filter can be configured with the `allow_missing` requirement that will be satisfied if JWT is missing (JwtMissed error) and fail if JWT is presented or invalid. Due to a mistake in implementation, a JwtUnknownIssuer error was mistakenly converted to JwtMissed when `requires_any` was configured. So if `allow_missing` was configured under `requires_any`, an attacker can bypass authentication by presenting a JWT token with an issuer that is not in the provider list. Integrity may be impacted depending on configuration if the JWT token is used to protect against writes or modifications. This regression was introduced on 2020/11/12 in PR 13839 which fixed handling `allow_missing` under RequiresAny in a JwtRequirement (see issue 13458). The AnyVerifier aggregates the children verifiers' results into a final status where JwtMissing is the default error. However, a JwtUnknownIssuer was mistakenly treated the same as a JwtMissing error and the resulting final aggregation was the default JwtMissing. As a result, `allow_missing` would allow a JWT token with an unknown issuer status. This is fixed in version 1.17.1 by PR 15194. The fix works by preferring JwtUnknownIssuer over a JwtMissing error, fixing the accidental conversion and bypass with `allow_missing`. A user could detect whether a bypass occurred if they have Envoy logs enabled with debug verbosity. Users can enable component level debug logs for JWT. The JWT filter logs will indicate that there is a request with a JWT token and a failure that the JWT token is missing."}, {"lang": "es", "value": "Envoy es un proxy edge/middle/service de servicio de alto rendimiento nativo de la nube. En versi\u00f3n 1.17.0 de Envoy, un atacante puede omitir la autenticaci\u00f3n presentando un token JWT con un emisor que no est\u00e1 en la lista de proveedores cuando el filtro de autenticaci\u00f3n JWT de Envoy est\u00e1 configurado con el requisito \"allow_missing\" en \"require_any\" debido a un error en la implementaci\u00f3n. El filtro de autenticaci\u00f3n JWT de Envoy puede ser configurado con el requisito \"allow_missing\" que se cumplir\u00e1 si falta JWT (error JwtMissed) y presentar\u00e1 un fallo si JWT existe o no es v\u00e1lido. Debido a un error en la implementaci\u00f3n, un error de JwtUnknownIssuer se convirti\u00f3 por error a JwtMissed cuando se configur\u00f3 \"require_any\". Entonces, si se configur\u00f3 \"allow_missing\" en \"require_any\", un atacante puede omitir la autenticaci\u00f3n al presentar un token JWT con un emisor que no est\u00e1 en la lista de proveedores. La integridad puede ser impactada seg\u00fan la configuraci\u00f3n si el token JWT se usa para proteger contra escrituras o modificaciones. Esta regresi\u00f3n fue introducida el 12/11/2020 en PR 13839, que corrigi\u00f3 el manejo de \"allow_missing\" en RequireAny en un JwtRequirement (consulte el problema 13458). AnyVerifier agrega los resultados de los comprobadores secundarios a un estado final donde JwtMissing es el error predeterminado. Sin embargo, un JwtUnknownIssuer se trat\u00f3 por error igual que un error JwtMissing y la agregaci\u00f3n final resultante fue el JwtMissing predeterminado. Como resultado, \"allow_missing\" permitir\u00eda un token JWT con un estado de emisor desconocido. Esto es corregido en versi\u00f3n 1.17.1 por PR 15194. La correcci\u00f3n funciona al preferir JwtUnknownIssuer sobre un error de JwtMissing, corrigiendo la conversi\u00f3n accidental y omitiendo con \"allow_missing\". Un usuario podr\u00eda detectar si se produjo una omisi\u00f3n si posee los registros de Envoy habilitados con verbosidad de depuraci\u00f3n Los usuarios pueden habilitar registros de depuraci\u00f3n a nivel de componente para JWT. Los registros del filtro JWT indicar\u00e1n que se presenta una petici\u00f3n con un token JWT y un fallo de que falta el token JWT"}], "id": "CVE-2021-21378", "lastModified": "2024-11-21T05:48:14.037", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 6.4, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 4.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-03-11T03:15:12.163", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/commit/ea39e3cba652bcc4b11bb0d5c62b017e584d2e5a"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/envoyproxy/envoy/pull/15194"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-4996-m8hf-hj27"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/commit/ea39e3cba652bcc4b11bb0d5c62b017e584d2e5a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/envoyproxy/envoy/pull/15194"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mitigation", "Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-4996-m8hf-hj27"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}, {"lang": "en", "value": "CWE-303"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-287"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank Istio Product Security Working Group for reporting this issue.", "bugzilla": {"description": "envoyproxy/envoy: JWT validation bypass when allow_missing is used", "id": "1933681", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1933681"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.2", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "status": "draft"}, "cwe": "CWE-287", "details": ["Envoy is a cloud-native high-performance edge/middle/service proxy. In Envoy version 1.17.0 an attacker can bypass authentication by presenting a JWT token with an issuer that is not in the provider list when Envoy's JWT Authentication filter is configured with the `allow_missing` requirement under `requires_any` due to a mistake in implementation. Envoy's JWT Authentication filter can be configured with the `allow_missing` requirement that will be satisfied if JWT is missing (JwtMissed error) and fail if JWT is presented or invalid. Due to a mistake in implementation, a JwtUnknownIssuer error was mistakenly converted to JwtMissed when `requires_any` was configured. So if `allow_missing` was configured under `requires_any`, an attacker can bypass authentication by presenting a JWT token with an issuer that is not in the provider list. Integrity may be impacted depending on configuration if the JWT token is used to protect against writes or modifications. This regression was introduced on 2020/11/12 in PR 13839 which fixed handling `allow_missing` under RequiresAny in a JwtRequirement (see issue 13458). The AnyVerifier aggregates the children verifiers' results into a final status where JwtMissing is the default error. However, a JwtUnknownIssuer was mistakenly treated the same as a JwtMissing error and the resulting final aggregation was the default JwtMissing. As a result, `allow_missing` would allow a JWT token with an unknown issuer status. This is fixed in version 1.17.1 by PR 15194. The fix works by preferring JwtUnknownIssuer over a JwtMissing error, fixing the accidental conversion and bypass with `allow_missing`. A user could detect whether a bypass occurred if they have Envoy logs enabled with debug verbosity. Users can enable component level debug logs for JWT. The JWT filter logs will indicate that there is a request with a JWT token and a failure that the JWT token is missing.", "An authentication bypass vulnerability was found in envoyproxy/envoy. When specifying a JSON Web Token (JWT) authentication filter, if `allow_missing` is also used, this flaw allows an attacker to craft a request with a JWT token with an incorrect issuer bypassing the filter. The highest threat from this vulnerability is to confidentiality and integrity."], "name": "CVE-2021-21378", "package_state": [{"cpe": "cpe:/a:redhat:service_mesh:1", "fix_state": "Not affected", "package_name": "servicemesh-proxy", "product_name": "OpenShift Service Mesh 1"}, {"cpe": "cpe:/a:redhat:service_mesh:2.0", "fix_state": "Not affected", "package_name": "servicemesh-proxy", "product_name": "OpenShift Service Mesh 2.0"}], "public_date": "2021-03-01T20:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-21378\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-21378\nhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-4996-m8hf-hj27\nhttps://istio.io/latest/news/security/istio-security-2021-001/"], "statement": "Only version 1.9.0 of upstream Istio is affected by the vulnerability. Therefore, even if the OpenShift ServiceMesh (OSSM) does package Istio, it is only v1.6.14 and is not affected.", "threat_severity": "Important", "upstream_fix": "envoyproxy/envoy 1.17.1"}