{ "containers": { "cna": { "affected": [ { "product": "synapse", "vendor": "matrix-org", "versions": [ { "status": "affected", "version": ">=0.99.0, < 1.25.0" } ] } ], "descriptions": [ { "lang": "en", "value": "Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.25.0, a malicious homeserver could redirect requests to their .well-known file to a large file. This can lead to a denial of service attack where homeservers will consume significantly more resources when requesting the .well-known file of a malicious homeserver. This affects any server which accepts federation requests from untrusted servers. Issue is resolved in version 1.25.0. As a workaround the `federation_domain_whitelist` setting can be used to restrict the homeservers communicated with over federation." } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "version": "3.1" } } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-400", "description": "CWE-400 Uncontrolled Resource Consumption", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2021-08-02T02:06:23", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M" }, "references": [ { "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-2hwx-mjrm-v3g8" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/matrix-org/synapse/releases/tag/v1.25.0" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/matrix-org/synapse/pull/8950" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/matrix-org/synapse/commit/ff5c4da1289cb5e097902b3e55b771be342c29d6" }, { "name": "FEDORA-2021-a627cfd31e", "tags": [ "vendor-advisory", "x_refsource_FEDORA" ], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/" } ], "source": { "advisory": "GHSA-2hwx-mjrm-v3g8", "discovery": "UNKNOWN" }, "title": "Denial of service attack via .well-known lookups", "x_legacyV4Record": { "CVE_data_meta": { "ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-21274", "STATE": "PUBLIC", "TITLE": "Denial of service attack via .well-known lookups" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "synapse", "version": { "version_data": [ { "version_value": ">=0.99.0, < 1.25.0" } ] } } ] }, "vendor_name": "matrix-org" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.25.0, a malicious homeserver could redirect requests to their .well-known file to a large file. This can lead to a denial of service attack where homeservers will consume significantly more resources when requesting the .well-known file of a malicious homeserver. This affects any server which accepts federation requests from untrusted servers. Issue is resolved in version 1.25.0. As a workaround the `federation_domain_whitelist` setting can be used to restrict the homeservers communicated with over federation." } ] }, "impact": { "cvss": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "version": "3.1" } }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-400 Uncontrolled Resource Consumption" } ] } ] }, "references": { "reference_data": [ { "name": "https://github.com/matrix-org/synapse/security/advisories/GHSA-2hwx-mjrm-v3g8", "refsource": "CONFIRM", "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-2hwx-mjrm-v3g8" }, { "name": "https://github.com/matrix-org/synapse/releases/tag/v1.25.0", "refsource": "MISC", "url": "https://github.com/matrix-org/synapse/releases/tag/v1.25.0" }, { "name": "https://github.com/matrix-org/synapse/pull/8950", "refsource": "MISC", "url": "https://github.com/matrix-org/synapse/pull/8950" }, { "name": "https://github.com/matrix-org/synapse/commit/ff5c4da1289cb5e097902b3e55b771be342c29d6", "refsource": "MISC", "url": "https://github.com/matrix-org/synapse/commit/ff5c4da1289cb5e097902b3e55b771be342c29d6" }, { "name": "FEDORA-2021-a627cfd31e", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/" } ] }, "source": { "advisory": "GHSA-2hwx-mjrm-v3g8", "discovery": "UNKNOWN" } } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T18:09:15.070Z" }, "title": "CVE Program Container", "references": [ { "tags": [ "x_refsource_CONFIRM", "x_transferred" ], "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-2hwx-mjrm-v3g8" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/matrix-org/synapse/releases/tag/v1.25.0" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/matrix-org/synapse/pull/8950" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/matrix-org/synapse/commit/ff5c4da1289cb5e097902b3e55b771be342c29d6" }, { "name": "FEDORA-2021-a627cfd31e", "tags": [ "vendor-advisory", "x_refsource_FEDORA", "x_transferred" ], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/" } ] } ] }, "cveMetadata": { "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-21274", "datePublished": "2021-02-26T17:25:16", "dateReserved": "2020-12-22T00:00:00", "dateUpdated": "2024-08-03T18:09:15.070Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }