CVE-2022-36009

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Matrix rooms where the `\"events_default\"` power level has not been changed from the default of zero are not vulnerable. Users are advised to upgrade. 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The power level parsing within gomatrixserverlib was failing to parse the `\"events_default\"` key of the `m.room.power_levels` event, defaulting the event default power level to zero in all cases. Power levels are the matrix terminology for user access level. In rooms where the `\"events_default\"` power level had been changed, this could result in events either being incorrectly authorised or rejected by Dendrite servers. gomatrixserverlib contains a fix as of commit `723fd49` and Dendrite 0.9.3 has been updated accordingly. Matrix rooms where the `\"events_default\"` power level has not been changed from the default of zero are not vulnerable. Users are advised to upgrade. There are no known workarounds for this issue."}, {"lang": "es", "value": "gomatrixserverlib es una biblioteca Go para la federaci\u00f3n de protocolos de Matrix. Dendrite es un servidor dom\u00e9stico de Matrix escrito en Go, una alternativa a Synapse. El an\u00e1lisis de los niveles de potencia dentro de gomatrixserverlib fallaba al analizar la clave \"\"events_default\" del evento \"m.room.power_levels\", poniendo a cero el nivel de potencia por defecto del evento en todos los casos. Los niveles de potencia son la terminolog\u00eda de la matriz para el nivel de acceso del usuario. En las salas en las que el nivel de potencia \"\"events_default\"\" hab\u00eda sido cambiado, esto pod\u00eda resultar en que los eventos fueran incorrectamente autorizados o rechazados por los servidores Dendrite. gomatrixserverlib contiene una correcci\u00f3n desde el commit \"723fd49\" y Dendrite versi\u00f3n 0.9.3 ha sido actualizado en consecuencia. Las salas de matrices en las que el nivel de potencia \"\"events_default\"\" no ha sido cambiado del valor predeterminado de cero no son vulnerables. Es recomendado a usuarios actualizar. No se presentan mitigaciones conocidas para este problema."}], "id": "CVE-2022-36009", "lastModified": "2026-06-17T04:52:43.903", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.0, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 3.4, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-36009", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-04-23T14:01:56.133510Z", "version": "2.0.3"}}]}, "published": "2022-08-19T21:15:08.547", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://matrix.org/docs/guides/moderation/#power-levels"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://matrix.org/docs/guides/moderation/#power-levels"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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