{"id":"CVE-2023-32323","state":"PUBLISHED","title":"Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites","description":"Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently.","publishedAt":"2023-05-26T13:32:01.632Z","updatedAt":"2025-02-13T16:50:32.310Z","severity":{"score":5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["matrix-org synapse"],"affected":[{"vendor":"matrix-org","product":"synapse","versions":[{"version":"< 1.74.0","status":"affected"}]}],"references":["https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr","https://github.com/matrix-org/synapse/issues/14492","https://github.com/matrix-org/synapse/pull/14642","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T20:06:00.499Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/32xxx/CVE-2023-32323.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-32323","state":"PUBLISHED","datePublished":"2023-05-26T13:32:01.632Z","dateUpdated":"2025-02-13T16:50:32.310Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2023-05-08T13:26:03.880Z"},"containers":{"cna":{"title":"Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites","descriptions":[{"lang":"en","value":"Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently."}],"affected":[{"vendor":"matrix-org","product":"synapse","versions":[{"version":"< 1.74.0","status":"affected"}]}],"references":[{"url":"https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr","name":"https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/matrix-org/synapse/issues/14492","name":"https://github.com/matrix-org/synapse/issues/14492","tags":["x_refsource_MISC"]},{"url":"https://github.com/matrix-org/synapse/pull/14642","name":"https://github.com/matrix-org/synapse/pull/14642","tags":["x_refsource_MISC"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/"}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20: Improper Input Validation","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2023-09-18T03:06:07.780Z"},"source":{"advisory":"GHSA-f3wc-3vxv-xmvr","discovery":"UNKNOWN"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr","name":"https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://github.com/matrix-org/synapse/issues/14492","name":"https://github.com/matrix-org/synapse/issues/14492","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/matrix-org/synapse/pull/14642","name":"https://github.com/matrix-org/synapse/pull/14642","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T15:10:24.899Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-01-14T20:00:17.125564Z","id":"CVE-2023-32323","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-01-14T20:00:25.608Z"}}]}}}